Analysis and evaluation method of shrinkage resistance performance of concrete

A technology for analysis and evaluation of concrete, applied in the direction of material inspection products, etc., can solve the problems of inability to design and optimize the concrete mix ratio, provide targeted guidance for raw materials, and differences in the degree of concrete shrinkage, so as to achieve good practical application value, improve correlation, and avoid The effect of economic input

Inactive Publication Date: 2015-07-08
TONGJI UNIV
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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...

Method used

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  • Analysis and evaluation method of shrinkage resistance performance of concrete
  • Analysis and evaluation method of shrinkage resistance performance of concrete
  • Analysis and evaluation method of shrinkage resistance performance of concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0041] In the same total glue 380kg / m 3 , the same water-cement ratio, the same mineral admixture replacement rate of 47%, compound mineral powder (80kg / m 3 ) and fly ash (100kg / m 3 ), the admixture amount is different, the admixture amount of the M1 group concrete is 0.8%, the slump is 200mm, the admixture amount of the M2 group concrete is 1.3%, and the fluidity is 600mm. 0.25, the latter sieves the slurry and calculates the water-cement ratio to be 0.34. The shrinkage rate of the sieved mortar of the M1 group for 3 days was 0.007%, and the shrinkage rate of the sieved mortar of the M2 group for 3 days was 0.012%. It can be seen that the early shrinkage is dominated by drying shrinkage, and under the same proportion, the drying shrinkage increases with the increase of the calculated water-cement ratio of the sieved slurry, and has nothing to do with the design water-cement ratio of the concrete, because the two The designed concrete water-cement ratio of both is 0.45. Th...

Embodiment 2

[0043] In the same total glue 380kg / m3 , under the same water-cement ratio, the same fluidity of 600-650mm, and the same mineral admixture replacement rate of 47%, single-mixed fly ash (180kg / m 3 ) at M3, the calculated water-cement ratio of the sieved slurry is 0.39; 3 ) when M4, the calculated water-cement ratio of the sieved slurry body is 0.31; and the mixed mineral powder (80kg / m 3 ) and fly ash (100kg / m 3 ) at M2, the calculated water-cement ratio of the sieved slurry body is 0.34. The mortar shrinkage rate of M2, M3, M4 group is as follows figure 2 shown.

[0044] The above test results are consistent with the performance characteristics of slag powder and fly ash, that is, the shape of slag powder particles is irregular and the water demand is large, so the water-cement ratio calculated by sieving the slurry is smaller when the slag powder is mixed alone than when it is mixed. However, fly ash particles have a good shape and have a certain water-reducing function....

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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...

Claims

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Application Information

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IPC IPC(8): G01N33/38
Inventor 王培铭杨健英徐玲琳李楠
Owner TONGJI UNIV
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