DIN EN 1367-4-2008 集料热和风化性能试验.第4部分:干燥收缩测定

标准号：DIN EN 1367-4-2008
中文标准名称：集料热和风化性能试验.第4部分:干燥收缩测定
英文标准名称：Tests for thermal and weathering properties of aggregates - Part 4: Determination of drying shrinkage; English version of DIN EN 1367-4:2008-06
标准类型：Q13
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：Q13
国际标准分类号：91.100.15
引用标准：EN 197-1;EN 932-1;EN 932-2;EN 932-5;EN 933-2
适用范围：This standard describes the reference method used for type testing and in cases of dispute, for determining theeffect of aggregates on the drying shrinkage of concrete. For other purposes, in particular factory productioncontrol, other methods may be used provided an appropriate working relationship with the reference method hasbeen established.This standard is based on the testing of concretes of fixed mix proportions and aggregates of 20 mm maximumsize.NOTE I Guidance on the use of larger size is given in Annex A. Precision data is not available for variations in size and forvariations in the water content of the test concrete.NOTE 2 In those cases where the drying shrinkage of a source of coarse aggregate only or a source of fine aggregate(sand) only are required, the other component to be used should be, respectively, a fine or coarse aggregate of known Iowshrinkage.NOTE 3 Aggregates with high water demand and/or porosity may in a concrete with a fixed water content result in a mixwith insufficient workability to allow full compaction of the test specimens. This is likely to occur with aggregates combinationshaving a composite water absorption value greater than 3,5% or oven-dried particle densities less than 2,45 Mg/m3 (e.g. forrecycled aggregates). In such instances a variation of the method (without precision data) may be carried out by one of thefollowing changes to the concrete mix: (a) use of aggregates in the saturated and surface dry condition. (b) use of water-reducing admixture.A note on the details of any modification to the mix design should be included with the test report.