ACI 207.5R-99

碾压大体积混凝土

ACI 207.5R-99

Roller-Compacted Mass Concrete

版本年份 1999 文件语言英语全文 6 页 格式 PDF

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标准信息

STANDARD INFORMATION

标准编号: ACI 207.5R-99
所属分类: ACI 美国混凝土学会标准
发布机构: American Concrete Institute (ACI)
版本年份: 1999
文件语言: 英语
文件格式: PDF
文件页数: 6 页
文件大小: 774.59 KB

中文名称为参考译名，文件语言以原文为准。

· 更新：2026-11-03

标准简介

OVERVIEW

中文简介

该报告介绍碾压混凝土（RCC）在大体积混凝土结构中的应用，包括材料、配合比、性能、设计、施工和质量控制。适用于采用无坍落度混凝土并用土石方设备运输、摊铺和压实的大体积混凝土工程。

English summary

This report covers the use of roller-compacted concrete (RCC) in mass concrete structures, including materials, mixture proportioning, properties, design, construction, and quality control. It applies to no-slump concrete transported, placed, and compacted with earth and rockfill construction equipment.

以上为根据文件整理的内容简介。

标准内容预览

DOCUMENT PREVIEW

ACI 207.5R-99PDF 第 1 页 · 原页码 1

We need answer user's request: produce HTML fragment only, no explanation. Need parse image OCR. Need obey strict tags/classes. Need output starts with h2 page title? Page has header "207.5R-2 ACI COMMITTEE REPORT" ignore header. Page content: left column has red Chapter 6 and Chapter 7 list, then CHAPTER 1—INTRODUCTION, sections 1.1 General, 1.2 What is RCC?, 1.3 History. Right column continues History. Need represent two-column layout? The page is two columns. Could use table class layout-columns with two td? But content flows across columns. Need preserve reading order? OCR engine should convert page. Since two-column layout, maybe use table class layout-columns with left and right columns. But content includes lists and headings. Allowed table with td. Need no style. Need page number placeholder at end:

. Need not include page header. Need include red chapter references? They are content, not header. Could be list? They are lines with chapter titles and subitems. Could use p and indent? Need preserve numbering. Could use

? The chapter lines are indented? In image, Chapter 6 red, then subitems indented. Could use

for chapter,

for subitems. But class indent allowed. Need no list? Could use ul? Allowed but no attributes. But numbering is manual, so p better. Need ensure no continuous spaces. Use superscripts for footnote references? Allowed sup. Need convert superscript numbers like 1.5, 1.6, etc. In image superscript after words: construction.1.5, dam.1.6, Authority.1.7,1.8, 19731.9? Actually "19731.9" likely 1973 superscript 1.9? Need represent as 1973^1.9. Similarly 1974.1.10, dam.1.11, Tarbela Dam.1.12, RCC dams.1.13,1.14,1.15, Dam.1.16,1.17, Italy.2.1,3, Canada.1.4, Bibliography.1.1. Need careful.

Need decide structure. Since two columns, maybe use

left content

right content

. But table inside allowed. Need each cell contains block elements? Allowed tags include p, h2 etc inside td? Yes. But table class layout-columns only allowed class. Need no thead. Could use ....... Need ensure valid HTML? td can contain p, h2, h3. Good.

But output must start with

. If we wrap in table, first tag would table, violating "每页输出必须以

开头". So cannot start with table. Need start with h2. Could put page title as h2 before table? The page has no main title? It has CHAPTER 1—INTRODUCTION. Could start with

CHAPTER 1—INTRODUCTION

, then table for two columns? But left column includes Chapter 6/7 before CHAPTER 1. If start with h2 CHAPTER 1, then table left includes chapter lists and sections? Need reading order? Maybe better: start with

Chapter 6—Quality control of RCC, p. 207.5R-35

? But page content includes multiple chapter headings. Requirement page内标题: first page h2, subsequent h2/h3. This page likely has chapter headings. Could start with

Chapter 6—Quality control of RCC, p. 207.5R-35

. Then list. Then

Chapter 7—General references and information sources, p. 207.5R-43

. Then

CHAPTER 1—INTRODUCTION

. But if two-column table, can't start with table. Could not use table; just linearize columns. That's acceptable? The layout is two columns but content reading order likely left column then right column. The instruction says two-column layout -> table class layout-columns. But also must start h2. Could start with h2 then table. But if h2 is first content? Maybe use

Chapter 6...

then table with left column containing rest of left column and right column containing right column. But then Chapter 6 h2 outside table, left td starts with its subitems. That's okay. But then Chapter 7 h2 inside left td? Could have multiple h2 inside td. Is that allowed? Yes. But output starts h2. Need maybe not use table because complex. But two-column layout should be represented. Could use table after first h2. Need ensure no invalid nesting? h2 inside td okay.

Alternative: start with

CHAPTER 1—INTRODUCTION

and then table left includes chapter lists? But then Chapter 6/7 before CHAPTER 1 in original left column; if h2 CHAPTER 1 first, order wrong. Could start with

Chapter 6...

then table left includes subitems and Chapter 7 and CHAPTER 1 sections, right includes continuation. That preserves start. But then Chapter 6 h2 outside table, left td starts with 6.1—General. Good.

Need consider if h2 inside table violates? no.

Need include all text. Need no style. Need no nbsp. Need no multiple spaces. Need use em for inline formula? none.

Need handle quotes: “concrete compacted by roller compaction; concrete that, in its unhardened state, will support a (vibratory) roller while being compacted.” Use curly quotes? okay. Need no Markdown.

Need maybe use for red headings? Allowed. Could use around Chapter 6 and 7? They are red bold. Use maybe. But headings h2 already. Could include strong inside h2? Allowed. But not necessary. Need preserve red? no.

Need page number at end:

Need ensure no forbidden tags. Use only allowed. Table class layout-columns. Need maybe use
? Avoid. Use p for paragraphs.

Need parse exact text.

Let's transcribe carefully.

Left column:

Chapter 6—Quality control of RCC, p. 207.5R-35

6.1—General

6.2—Activities prior to RCC placement

6.3—Activities during RCC placement

6.4—Activities after RCC placement

Chapter 7—General references and information sources, p. 207.5R-43

7.1—General

7.2—ASTM Standards

7.3—U.S. Army Corps of Engineers test procedures

7.4—U.S. Bureau of Reclamation test procedures

7.5—ACI References

7.6—Gravity dam design references

7.7—References cited in text

CHAPTER 1—INTRODUCTION

1.1—General

Roller-compacted concrete (RCC) is probably the most important development in concrete dam technology in the past quarter century. The use of RCC has allowed many new dams to become economically feasible due to the reduced cost realized from the rapid construction method. It also has provided design engineers with an opportunity to economically rehabilitate existing concrete dams that have problems with stability and need buttressing, and has improved embankment dams with inadequate spillway capacity by providing a means by which they can be safely overtopped.

This document summarizes the current state-of-the-art for design and construction of RCC in mass concrete applications. It is intended to guide the reader through developments in RCC technology, including materials, mixture proportioning, properties design considerations, construction, and quality control and testing. Although this report deals primarily with mass placements, RCC is also used for pavements, which are covered in ACI 325.1R.

1.2—What is RCC?

ACI 116 defines RCC as “concrete compacted by roller compaction; concrete that, in its unhardened state, will support a (vibratory) roller while being compacted. RCC is usually mixed using high-capacity continuous mixing or batching equipment, delivered with trucks or conveyors, and spread with one or more bulldozers in layers prior to compaction. RCC can use a broader range of materials than conventional concrete. A summary of RCC references is given in the 1994 USCOLD Annotated Bibliography.1.1

1.3—History

The rapid worldwide acceptance of RCC is a result of economics and of RCC’s successful performance. During the 1960s and 1970s, there were uses of materials that can be considered RCC. These applications led to the development of RCC in engineered concrete structures. In the 1960s, a high-production no-slump mixture that could be spread with bulldozers was used at Alpe Gere Dam in Italy2.1,3 and at Manicouagan 1 in Canada.1.4 These mixtures were consolidated

Right column:

with groups of large internal vibrators mounted on backhoes or bulldozers.

Fast construction of gravity dams using earthmoving equipment, including large rollers for compaction, was suggested in 1965 as a viable approach to more economical dam construction.1.5 However, it did not receive much attention until it was presented by Raphael in 1970 for the “optimum gravity dam.”1.6 The concept considered a section similar to but with less volume than the section of an embankment dam. During the 1970s, a number of projects ranging from laboratory and design studies to test fills, field demonstrations, nonstructural uses, and emergency mass uses were accomplished and evaluated using RCC. These efforts formed a basis for the first RCC dams, which were constructed in the 1980s.

Notable contributions were made in 1972 and 1974 by Cannon, who reported studies performed by the Tennessee Valley Authority.1.7,1.8 The U.S. Army Corps of Engineers conducted studies of RCC construction at the Waterways Experiment Station in 19731.9 and at Lost Creek Dam in 1974.1.10 The early work by the U.S. Army Corps of Engineers was in anticipation of construction of “an optimum gravity dam” for Zintel Canyon Dam.1.11 Zintel Canyon Dam construction was not funded at the time, but many of its concepts were carried over to Willow Creek Dam, which then became the first RCC dam in the U.S.

Developed initially for the core of Shimen Dam in 1960, Lowe used what he termed “rollcrete” for massive rehabilitation efforts at Tarbela Dam in Pakistan beginning in 1974. Workers placed 460,000 yd3 (350,000 m3) of RCC at Tarbela Dam in 42 working days to replace rock and embankment materials for outlet tunnel repairs. Additional large volumes of RCC were used later in the 1970s to rehabilitate the auxiliary and service spillways at Tarbela Dam.1.12

Dunstan conducted extensive laboratory studies and field trials in the 1970s using high-paste RCC in England. Further studies were conducted in the UK under the sponsorship of the Construction Industry Research and Information Association (CIRIA) and led to more refined developments in laboratory testing of RCC and construction methods, including horizontal slipformed facing for RCC dams.1.13,1.14,1.15

Beginning in the late 1970s in Japan, the design and construction philosophy referred to as roller-compacted dam (RCD) was developed for construction of Shimajigawa Dam.1.16,1.17 In the context of this report, both RCC and the material for RCD will be considered the same. Shimajigawa Dam was completed in 1981, with approximately half of its total concrete [216,000 yd3 (165,000 m3)] being RCC. The RCD methods uses RCC for the interior of the dam with relatively thick [approximately 3 ft (1 m)] conventional mass-concrete zones at the upstream and downstream faces, the foundation, and the crest of the dam. Frequent joints (sometimes formed) are used with conventional waterstops and drains. Also typical of RCD are thick lifts with delays after the placement of each lift to allow the RCC to cure and, subsequently, be thoroughly cleaned prior to placing the next lift. The RCD process results in a dam with conventional concrete appearance and behavior, but it requires additional

Need maybe right column continues to next page, no end. Need include all.

Need decide superscripts. In image, superscript numbers after periods: construction.1.5? Actually text: "construction.1.5" with superscript 1.5 after period? It appears "construction.1.5" where 1.5 superscript. Need output as construction.^1.5. For "dam.1.6" maybe "dam.^1.6". For "Authority.1.7,1.8" -> Authority.^1.7,1.8. For "19731.9" likely "1973^1.9" no period? In image: "19731.9" with superscript 1.9 immediately after 1973. Could be "1973^1.9". For "1974.1.10" -> 1974.^1.10. For "Dam.1.11" -> Dam.^1.11. For "Dam.1.12" -> Dam.^1.12. For "dams.1.13,1.14,1.15" -> dams.^{1.13,1.14,1.15}. For "Dam.1.16,1.17" -> Dam.^1.16,1.17. For "Italy.2.1,3" -> Italy.^2.1,3. For "Canada.1.4" -> Canada.^1.4. For "Bibliography.1.1" -> Bibliography.^1.1.

Need maybe units: yd3 and m3 should be superscript 3? In image yd³ and m³. Allowed sup. Use yd³ (350,000 m³). Good.

Need maybe "RCC’s" curly apostrophe. okay.

Need maybe "state-of-the-art" hyphen. okay.

Need maybe "U.S." with periods. okay.

Need maybe "ACI 325.1R." no superscript.

Need maybe "ACI 116" no superscript.

Need maybe "1994 USCOLD Annotated Bibliography.1.1" superscript after period. Good.

Need maybe "Alpe Gere Dam" no accent? image Alpe Gere. okay.

Need maybe "Manicouagan 1" with space. okay.

Need maybe "backhoes". okay.

Need maybe "nonstructural" no hyphen? image nonstructural. okay.

Need maybe "slipformed". okay.

Need maybe "waterstops". okay.

Need maybe "RCD methods uses" grammar as original. Keep.

Need maybe "additional" at end no period. Keep.

Need decide if use h2 for Chapter 6, Chapter 7, CHAPTER 1. The instruction: page内标题: first page h2, subsequent h2/h3. Could use h2 for all chapter headings. Section headings 1.1 etc maybe h3. But if inside table, okay. Need output starts with h2. Could do:

Chapter 6—Quality control of RCC, p. 207.5R-35

6.1—General

...

Chapter 7—General references and information sources, p. 207.5R-43

...

CHAPTER 1—INTRODUCTION

1.1—General

...

with groups...

...

But is it okay to have h2 inside td? yes. But output starts with h2. However, the first h2 is outside table, then table left td starts with 6.1. This splits Chapter 6 heading from its subitems. Fine. But maybe better to put all left column inside table and start with h2 inside first td? Can't because output must start h2. Could start with h2 then table. Good.

But if we put Chapter 6 h2 outside, then table left td includes subitems and Chapter 7 etc. The right column starts with continuation of 1.3 History, but left td includes 1.3 History beginning. Reading order: h2 Chapter 6, left td subitems, Chapter 7, CHAPTER 1, 1.1, 1.2, 1.3 first part, then right td continuation. That's okay.

Need maybe use for red chapter headings? Could:

Chapter 6—Quality control of RCC, p. 207.5R-35

. Allowed. But maybe unnecessary. Use strong to reflect bold/red? okay. But if h2 already bold, no need. Could avoid extra.
Need maybe use
for subitems. The subitems are indented relative to chapter. Use indent. For section headings 1.1—General maybe not indent? In image left aligned with section number. Could use h3. For chapter subitems 6.1 etc use p indent. For 7.x use p indent. Good.

Need maybe use
for "6.1—General" etc. No list. Good.

Need ensure no continuous spaces. Use single spaces.

Need maybe table layout-columns with td. Should we include
? Allowed. Could use
... ...
. Allowed. Need no caption. Good.
Potential issue: The first h2 outside table then table with left td containing h2 Chapter 7 and CHAPTER 1. Multiple h2 okay. But requirement page内标题 first page h2, subsequent h2/h3. okay.

Potential issue: The page has two columns but left column includes chapter lists and article; right column continuation. Using table layout-columns may be expected. Good.

Need maybe not include page header "207.5R-2 ACI COMMITTEE REPORT". Ignore.

Need maybe include page number placeholder at end. yes.

Need maybe no
. Use paragraphs.

Need maybe no . none.
Need maybe no
. none. Need maybe no . none. Need maybe no . none. Need maybe no . none. Need maybe no / . Could use p. Good. Need maybe references? The chapter lists are not references? They are table of contents-like. Keep as p indent. Need maybe "Chapter 7—General references and information sources, p. 207.5R-43" line breaks in image: "Chapter 7—General references and information" then "sources, p. 207.5R-43". We can combine into one h2. Good. Need maybe "Chapter 6—Quality control of RCC, p. 207.5R-35" one line. Good. Need maybe "CHAPTER 1—INTRODUCTION" all caps. Use h2. Good. Need maybe section headings: "1.1—General", "1.2—What is RCC?", "1.3—History". Use h3. Good. Need maybe paragraph after 1.3 History left column ends "consolidated" and right column starts "with groups...". Should we combine into one paragraph across table? Since table columns separate, can't combine. Could in left td end with The rapid ... consolidated and right td start with with groups ... . That's faithful to layout. Good.

Need maybe right column first paragraph is continuation, not separate paragraph? It starts lower-case "with groups". In right td, use
with groups...
. Good.
Need maybe right column has multiple paragraphs. Good.

Need maybe left column 1.1 has two paragraphs. Good.

Need maybe 1.2 one paragraph. Good.

Need maybe 1.3 left one paragraph. Good.

Need maybe right column first paragraph continuation of 1.3, then new paragraph "Fast construction...". Good.

Need maybe right column last paragraph ends "additional" no period. Keep.

Need maybe use em for inline formula? none.

Need maybe use ^{for footnote references. Good.}
Need check allowed tags: sup allowed. strong allowed. em allowed. table, tbody, tr, td. p, h2, h3. Good.

Need ensure class only allowed: layout-columns, indent, align-center. Good.

Need no style. Good.

Need no nbsp. Good.

Need no Markdown. Good.

Need final only HTML. Good.

Let's consider if using h2 outside table then table might be considered not starting with page title? It starts with Chapter 6, which is a page content heading. Good.

Could there be a better approach: start with
CHAPTER 1—INTRODUCTION
and then table left includes chapter lists? But original order left column top is Chapter 6/7. The page is likely from ACI report, with chapter list at top left. The main content starts CHAPTER 1. The requirement "每页输出必须以
开头（页面内标题）" maybe means the first heading on page. The first heading visually is Chapter 6 red. So start with that. Good.
Need maybe use h2 for Chapter 6 and Chapter 7, but they are not main section? They are chapter headings. okay.

Need maybe use h3 for CHAPTER 1? Since first page? It says first page use h2, subsequent pages h2/h3. This page maybe page 2, but still page内标题. Could use h2 for all top-level headings. Good.

Potential issue: If we put h2 inside td, some validators allow. Good.

Need maybe table class layout-columns should have two columns. Good.

Need maybe no attributes on td except none. Good.

Need maybe no empty cells. Good.

Need maybe line breaks in h2? no.

Need maybe preserve em dash? Use —. Good.

Need maybe preserve quotes: “ ”. Good.

Need maybe preserve apostrophe: RCC’s. Good.

Need maybe preserve "U.S." etc.

Need maybe preserve "ACI 325.1R." no superscript.

Need maybe preserve "ACI 116". Good.

Need maybe preserve "1994 USCOLD". Good.

Need maybe preserve "Shimen Dam". Good.

Need maybe preserve "Tarbela Dam". Good.

Need maybe preserve "Willow Creek Dam". Good.

Need maybe preserve "Zintel Canyon Dam". Good.

Need maybe preserve "Lost Creek Dam". Good.

Need maybe preserve "Waterways Experiment Station". Good.

Need maybe preserve "Tennessee Valley Authority". Good.

Need maybe preserve "CIRIA". Good.

Need maybe preserve "Shimajigawa Dam". Good.

Need maybe preserve "RCD". Good.

Need maybe preserve "waterstops". Good.

Need maybe preserve "lifts". Good.

Need maybe preserve "additional" no period. Good.

Need maybe include footnote references as sup with commas. Good.

Let's think about exact superscript placement:

- "construction.1.5" In image: "construction.1.5" with superscript 1.5 after period? It shows "construction.1.5" where 1.5 superscript. Usually reference superscript after period: construction.^1.5. Good.

- "dam.1.6" after period? "gravity dam.1.6" likely dam.^1.6. Good.

- "Authority.1.7,1.8" -> Authority.^1.7,1.8.

- "19731.9" Could be "1973^1.9" no period. In text: "in 19731.9 and at Lost Creek Dam in 1974.1.10" The superscript 1.9 after 1973, no period. Use 1973^1.9. Good.

- "1974.1.10" -> 1974.^1.10.

- "Dam.1.11" -> Dam.^1.11.

- "Dam.1.12" -> Dam.^1.12.

- "dams.1.13,1.14,1.15" -> dams.^{1.13,1.14,1.15}.

- "Dam.1.16,1.17" -> Dam.^1.16,1.17.

- "Italy.2.1,3" -> Italy.^2.1,3.

- "Canada.1.4" -> Canada.^1.4.

- "Bibliography.1.1" -> Bibliography.^1.1.

Need maybe "Alpe Gere Dam in Italy2.1,3" no period before superscript? Image: "Italy.2.1,3"? It shows "Italy.2.1,3" with superscript after period? Let's inspect: "used at Alpe Gere Dam in Italy.2.1,3 and at Manicouagan 1 in Canada.1.4" There is period after Italy? It appears "Italy.2.1,3" maybe period then superscript 2.1,3. Use Italy.^2.1,3. Good.

Need maybe "construction.1.5" period before superscript. Good.

Need maybe "dam.1.6" period. Good.

Need maybe "Authority.1.7,1.8" period. Good.

Need maybe "19731.9" no period. Good.

Need maybe "1974.1.10" period. Good.

Need maybe "Dam.1.11" period. Good.

Need maybe "Dam.1.12" period. Good.

Need maybe "dams.1.13,1.14,1.15" period. Good.

Need maybe "Dam.1.16,1.17" period. Good.

Need maybe "Bibliography.1.1" period. Good.

Need maybe "ACI 325.1R." no superscript. Good.

Need maybe "ACI 116 defines RCC as “concrete..." Good.

Need maybe "RCC is usually mixed using high-capacity continuous mixing or batching equipment, delivered with trucks or conveyors, and spread with one or more bulldozers in layers prior to compaction." Good.

Need maybe "A summary of RCC references is given in the 1994 USCOLD Annotated Bibliography.1.1" Good.

Need maybe "The rapid worldwide acceptance of RCC is a result of economics and of RCC’s successful performance." Good.

Need maybe "During the 1960s and 1970s, there were uses of materials that can be considered RCC." Good.

Need maybe "These applications led to the development of RCC in engineered concrete structures." Good.

Need maybe "In the 1960s, a high-production no-slump mixture that could be spread with bulldozers was used at Alpe Gere Dam in Italy.^2.1,3 and at Manicouagan 1 in Canada.^1.4 These mixtures were consolidated" Good.

Need maybe right column: "with groups of large internal vibrators mounted on backhoes or bulldozers." Good.

Need maybe "Fast construction of gravity dams using earthmoving equipment, including large rollers for compaction, was suggested in 1965 as a viable approach to more economical dam construction.^1.5 However, it did not receive much attention until it was presented by Raphael in 1970 for the “optimum gravity dam.”^1.6 The concept considered a section similar to but with less volume than the section of an embankment dam. During the 1970s, a number of projects ranging from laboratory and design studies to test fills, field demonstrations, nonstructural uses, and emergency mass uses were accomplished and evaluated using RCC. These efforts formed a basis for the first RCC dams, which were constructed in the 1980s." Good.

Need maybe "Notable contributions were made in 1972 and 1974 by Cannon, who reported studies performed by the Tennessee Valley Authority.^1.7,1.8 The U.S. Army Corps of Engineers conducted studies of RCC construction at the Waterways Experiment Station in 1973^1.9 and at Lost Creek Dam in 1974.^1.10 The early work by the U.S. Army Corps of Engineers was in anticipation of construction of “an optimum gravity dam” for Zintel Canyon Dam.^1.11 Zintel Canyon Dam construction was not funded at the time, but many of its concepts were carried over to Willow Creek Dam, which then became the first RCC dam in the U.S." Good.

Need maybe "Developed initially for the core of Shimen Dam in 1960, Lowe used what he termed “rollcrete” for massive rehabilitation efforts at Tarbela Dam in Pakistan beginning in 1974. Workers placed 460,000 yd³ (350,000 m³) of RCC at Tarbela Dam in 42 working days to replace rock and embankment materials for outlet tunnel repairs. Additional large volumes of RCC were used later in the 1970s to rehabilitate the auxiliary and service spillways at Tarbela Dam.^1.12" Good.

Need maybe "Dunstan conducted extensive laboratory studies and field trials in the 1970s using high-paste RCC in England. Further studies were conducted in the UK under the sponsorship of the Construction Industry Research and Information Association (CIRIA) and led to more refined developments in laboratory testing of RCC and construction methods, including horizontal slipformed facing for RCC dams.^{1.13,1.14,1.15}" Good.

Need maybe "Beginning in the late 1970s in Japan, the design and construction philosophy referred to as roller-compacted dam (RCD) was developed for construction of Shimajigawa Dam.^1.16,1.17 In the context of this report, both RCC and the material for RCD will be considered the same. Shimajigawa Dam was completed in 1981, with approximately half of its total concrete [216,000 yd³ (165,000 m³)] being RCC. The RCD methods uses RCC for the interior of the dam with relatively thick [approximately 3 ft (1 m)] conventional mass-concrete zones at the upstream and downstream faces, the foundation, and the crest of the dam. Frequent joints (sometimes formed) are used with conventional waterstops and drains. Also typical of RCD are thick lifts with delays after the placement of each lift to allow the RCC to cure and, subsequently, be thoroughly cleaned prior to placing the next lift. The RCD process results in a dam with conventional concrete appearance and behavior, but it requires additional" Good.

Need maybe "methods uses" original. Keep.

Need maybe "additional" no period. Good.

Potential issue: The table layout-columns with left td containing many block elements and right td containing paragraphs. The first h2 outside table may cause left column not include Chapter 6 heading. But okay. Could instead start with
Chapter 6...
then table. Need maybe include Chapter 6 subitems in left td. Good.

Need maybe use
for 6.1 etc. But if inside td, indent class allowed. Good.

Need maybe use
for 7.x. Good.

Need maybe use
for Chapter 7 inside td. Good.
Need maybe use
for CHAPTER 1 inside td. Good.
Need maybe use
for 1.1 etc. Good.
Need maybe no . Could use for red headings? Maybe not. But if we want reflect bold, h2 enough. The chapter headings are red and bold. h2 bold. Good.
Need maybe if h2 inside td, the first h2 outside and h2 inside. Good.

Need maybe table should have
. Good.
Need maybe no caption. Good.

Need maybe no thead. Good.

Need maybe no th. Good.

Need maybe no colspan/rowspan. Good.

Need maybe no attributes on table except class. Good.

Need maybe no attributes on p except class. Good.

Need maybe no attributes on h2/h3. Good.

Need maybe no attributes on sup. Good.

Need maybe no style. Good.

Need maybe no comments. Good.

Let's consider if using table for two columns may be too much and could violate "每页输出必须以
开头" if we put h2 outside. Good.
Could there be a requirement that page number placeholder is 2, not actual page number? It says 页码用
2
结尾. So output 2. Good.
Need maybe if page has no page title? It has headings. Good.

Need maybe if there are footnotes? none.

Need maybe if references list? chapter 7 list is references? Keep.

Need maybe if "Chapter 7—General references and information sources, p. 207.5R-43" is a heading and subitems are list. Could use
with
no attributes. But numbering manual. Could use
. Good.

Need maybe if "6.1—General" etc are not paragraphs but list items. p indent okay.

Need maybe if "CHAPTER 1—INTRODUCTION" is all caps, use h2. Good.

Need maybe if "1.1—General" is heading, use h3. Good.

Need maybe if "1.2—What is RCC?" heading, use h3. Good.

Need maybe if "1.3—History" heading, use h3. Good.

Need maybe if right column first paragraph is continuation, should not have h3. Good.

Need maybe if left column 1.3 paragraph ends with "consolidated" and right column starts "with groups". Could combine by putting right column first paragraph in same p? Not possible across table. Could avoid table and linearize: after left 1.3 paragraph, continue right column in same paragraph? But then two-column layout not represented. The instruction says two-column layout -> table. But maybe table is optional? It says 排版替代方案 (不要自己发明) - two-column layout -> table class layout-columns. So use table.

Need maybe if table cells contain headings, the first h2 outside table means left column heading not in cell. Could instead start with
Chapter 6...
then table. Good.
Need maybe if we want all left column in table, we could start with
Chapter 6...
and then table left td starts with subitems. Good.
Need maybe if Chapter 6 heading is red, but h2 outside table not in left column. Fine.

Need maybe if there is a page header ignored. Good.

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ACI 207.5R-99

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碾压大体积混凝土

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. If we wrap in table, first tag would table, violating "每页输出必须以

开头". So cannot start with table. Need start with h2. Could put page title as h2 before table? The page has no main title? It has CHAPTER 1—INTRODUCTION. Could start with

CHAPTER 1—INTRODUCTION

Chapter 6—Quality control of RCC, p. 207.5R-35

Chapter 6—Quality control of RCC, p. 207.5R-35

Chapter 7—General references and information sources, p. 207.5R-43

CHAPTER 1—INTRODUCTION

Chapter 6...

CHAPTER 1—INTRODUCTION

Chapter 6...

Chapter 6—Quality control of RCC, p. 207.5R-35

Chapter 7—General references and information sources, p. 207.5R-43

CHAPTER 1—INTRODUCTION

1.1—General

Chapter 6—Quality control of RCC, p. 207.5R-35

CHAPTER 1—INTRODUCTION

开头（页面内标题）" maybe means the first heading on page. The first heading visually is Chapter 6 red. So start with that. Good.

Chapter 6...

for Chapter 7 inside td. Good.

for CHAPTER 1 inside td. Good.

for 1.1 etc. Good.

开头" if we put h2 outside. Good.

Chapter 6...

Chapter 6...

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