Method for evaluating effectiveness of measure for inhibiting alkali-silica active reaction of concrete aggregate

A concrete aggregate and active reaction technology, which is applied in the field of evaluating the effectiveness of concrete aggregate alkali-silicic acid active reaction inhibition measures, can solve problems such as imperfect inhibition efficiency, difficult time to meet, active aggregate activity, etc.
CN101514982AActive Publication Date: 2009-08-26POWERCHINA ZHONGNAN ENG
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
POWERCHINA ZHONGNAN ENG
Publication Date
2009-08-26

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Abstract

A method for evaluating effectiveness of a measure for inhibiting alkali-silica active reaction of concrete aggregate comprises the following steps: using active aggregate used in actual works and low-alkali cement with available alkali Na2O content less than or equal to 0.60% or high-alkali cement with available alkali Na2O content of 0.90%+ / -0.1% to form mortar test pieces by mixing fly ash, and determining an inhibition measure effective where low-alkali cement mortar test pieces are formed and expansion rate of the mortar test pieces in 14 days is equal to or less than 0.040%, and determining the inhibition measure effective where high-alkali cement mortar test pieces mixed with the fly ash are formed and expansion rate of the mortar test pieces in 14 days is equal to or less than 0.050%. Thus, the method can help quickly determine the expansion rate of the mortar test pieces formed with the active aggregate used in actual works, and verify and evaluate the effectiveness of the measure for inhibiting the reaction of the concrete aggregate to meet engineering construction need.
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Description

Technical field

[0001] The invention relates to a measure for inhibiting the alkali-silicic acid activity reaction of concrete aggregates, and particularly relates to a method for evaluating the effectiveness of the measures for inhibiting the alkali-silicic acid activity reaction of concrete aggregates. Background technique

[0002] At present, a number of hydropower projects in my country including Xiangjiaba Hydropower Station, Sanbanxi Hydropower Station, Jinping Hydropower Station have successively carried out experimental research work to prevent concrete alkali-aggregate reaction. The experimental research results show that: the use of low-alkali cement (effective alkali Na 2 O content ≤ 0.60%), mixing concrete with admixtures that can consume the effective alkali in concrete and other measures to control the total alkali content of concrete can significantly inhibit the aggregate alkali-silicic acid activity reaction.

[0003] The effect of concrete aggregate alkali-silic...

Claims

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