Test device and method for evaluating work performance of pervious concrete
A technology of permeable concrete and test equipment, applied in the direction of measuring equipment, instruments, scientific instruments, etc., can solve the problems of guidance constraints, incompleteness, and no consideration of the amount of cement paste, etc., and achieve the effect of preventing bottom plugging
Inactive Publication Date: 2017-03-08
SOUTHEAST UNIV
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Problems solved by technology
However, the table-jumping method to test the fluidity of cement paste can only evaluate the viscosity of cement paste without considering the amount of cement paste, so its evaluation of pervious concrete is limited and incomplete.
Only considering the viscosity of the cement paste has a certain degree of significance for the actual construction, but due to its own limitations, there are also great restrictions on the guidance of the actual construction
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[0025] 1. The mix ratio used in the test:
[0026] The raw materials used in the test are shown in the table below:
[0027]
[0028] In this mix ratio, the silica fume is externally mixed, accounting for 4% of the cement mass. The water-binder ratio of A1 is 0.28, the bone-ash ratio is 4, and the admixture amount is 2.5% of the cement mass; the water-binder ratio of A2 is 0.31, the bone-ash ratio is 2, and the admixture amount is 2.5% of the cement mass.
[0029] 2. The test device used in the test:
[0030] The device consists of two interconnected upper and lower parts. The upper part is a cylindrical tube I with an inner diameter of 100mm and a height of 100mm. The bottom of the cylindrical tube I has neatly arranged grid lines. There are four symmetrical screw holes with a diameter of 8mm around the bottom of the cylindrical tube I; the upper cylindrical tube I The grid lines at the bottom are steel wire grid lines; when the minimum particle size of the coarse aggre...
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Abstract
The invention discloses a test device and a method for evaluating the work performance of pervious concrete. The device consists of an upper part and a lower part in mutual connection, wherein the upper part is a cylinder I with the inner diameter being 100mm and the height being 100mm; the bottom of the cylinder I is provided with regularly arranged grid lines; the lower part is a cylinder II with the inner diameter being 100mm and the height being 50mm; an opening formed in the bottom of the cylinder II is sealed. When the device is used, freshly mixed pervious concrete is charged into the upper part of the test device in two layers; in the charging process, the insertion and pounding from outside to inside are performed for 10 times; after the pervious concrete is compacted, a concrete surface is flatly smeared; the upper part and the lower part of the test device are fixedly connected through screw bolts; a vibrating table is started; the mass of slurry passing through grids is weighed; a final evaluation result of the work performance of the pervious concrete is obtained. Compared with the prior art, the prepared pervious concrete can be enabled not to generate a bottom sealing and blocking phenomenon.
Description
technical field [0001] The invention relates to the field of building construction, in particular to a test device and method for evaluating the working performance of permeable concrete. Background technique [0002] The importance of permeable concrete in the construction of sponge cities: [0003] At present, my country's urbanization level is developing rapidly, and in the process of urbanization, non-permeable cement concrete pavement has gradually replaced the original green vegetation, changing the natural soil vegetation and the natural permeable properties of the underlying layer. The non-permeable cement concrete pavement hinders the interaction between natural rainwater, underground soil and groundwater. Rainfall can only enter rivers, lakes and seas through the city's drainage system, resulting in the city's groundwater being unable to be replenished in a timely manner and affecting the rainwater supply. use efficiently. When the rainfall is large and the rainw...
Claims
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IPC IPC(8): G01N5/00
CPCG01N5/00
Inventor 高建明倪凯翔左媛
Owner SOUTHEAST UNIV