Analysis and evaluation method of shrinkage resistance performance of concrete

Abstract

The invention relates to an analysis and evaluation method of shrinkage resistance performance of concrete, which includes following steps: (1) screening, maintenance and test of mortar: screening stirred concrete to remove coarse aggregate therein, performing tap-moulding and wax-sealed maintenance, and performing shrinkage rate test to the wax-sealed mortar sample in a specified age period; (2) screening same concrete to obtain cement slurry and calculating the water-binder ratio of the screened cement slurry; and (3) comparing the test result of the shrinkage rate with the water-cement ratio relationship of the screened cement slurry to analyze and evaluate the shrinkage resistance performance of concrete. Compared with a method in the prior art, the method is increased in correlation between the test result of the shrinkage resistance test and the shrinkage resistance performance of the concrete, so that direct and indirect action effect and a synergistic effect among each factor influencing the shrinkage resistance performance can be differented better. The method provides a more specific guide to optimization design of mix proportions of durable concrete and has an excellent practical application value.

Description

technical field [0001] The invention relates to a durability test and evaluation method for concrete materials, in particular to an analysis and evaluation method for concrete shrinkage resistance. Background technique [0002] The following two methods are often used to test the shrinkage resistance of concrete, namely the concrete drying shrinkage test method and the drying shrinkage test of mortar without coarse aggregate. Although the above two methods are widely used, there are still many deficiencies in these two methods. First of all, the test specimens used are all cured under constant temperature and humidity conditions (generally, the formwork is removed and cured naturally after 1 day), which is quite different from the actual concrete structure molded curing conditions, which cannot well reflect the actual shrinkage performance of the concrete structure. In addition, both of these two test methods focus on the drying shrinkage performance, basically ignoring the...

AI Technical Summary

Problems solved by technology

For example, mineral admixtures and admixtures of different origins and properties, such as viscosity modifiers, will have different effects on the workability and cohesion of concrete—under the same mix ratio, due to changes in the amount of admixtures While changing the fluidity of concrete, although the water-cement ratio has not changed, there is a significant difference in the degree of shrinkage of the concrete.

Therefore, the above two drying shrinkage test methods cannot provide fully targeted guidance for the optimization of concrete mix design and the selection of raw materials

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