水泥试验方法：收缩与膨胀的测定

6 测量

在进行每轮测量前，测量仪的零点校准都要按第 5.3 段中的内容进行。

测量时试件要垂直放置在测量仪上并且在读数前将试件绕纵轴线旋转一圈。

如果在一次到另一次测量的过程中，三个试件中任一试件的长度变化超过试件长度变化最小 0.02 毫米，则需找出其变化的原因（尘土、接触不良、钉头松脱等等）而且如果该问题还不能解决，则应将该试件丢弃。

7 测量结果的表示

对于三个试件中的任何一个，相对的长度变化是根据脱模时的首次测量结果和特定龄期的最终测量结果的差额来计算的。

这种相对的长度变化，以微米/米来表示，由下列公式来定义：

dL/L × 1000

其中：

dL 是以微米表示的长度变化

L 为等于 160 毫米的基准长度

特定龄期的收缩与膨胀率等于对三联试件的各联进行测量得出的结果中十几个最接近的数值的算术平均数。

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SOMMAIRE

TABLE DES MATIÈRES

:current

Foreword

This document (EN 10216-3:2002) has been prepared by Technical Committee EC/TC 29, "Steel tubes and fittings for steel tubes", the secretariat of which is held by UNI.

This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2002, and conflicting national standards shall be withdrawn at the latest by November 2002.

This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s).

For relationship with EU Directive(s), see informative annex ZA, which is an integral part of this document.

Other Parts of EN 10216 are:

Another European Standard series covering tubes for pressure purposes is:

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.

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ISO 657-1 : 1988 (E)

Table 1 — Dimensions and sectional properties of hot-rolled equal-leg angles (concluded)

NOTES

1. Member countries may choose, to be included in their national standards, the sizes which are required to meet their demand.
2. For the angles so chosen, only thicknesses which can be rolled in their mills to meet the demand of the users may be selected from the list of thicknesses corresponding to equal angles in table 1.
3. The sectional area has been calculated using the formula

   S = [l/2 A - l) + 0,214 6 (r_root² - 2r_toe²)] × 1/100

   where
   

   S is the sectional area, in square centimetres;
   

   l is the thickness, in millimetres;
   

   r_root is the root radius, in millimetres;
   

   r_toe is the toe radius, in millimetres;
   

   A is the leg length, in millimetres.

4. Mass is calculated on the basis of density of steel of 7,85 kg/dm³.

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