Method for testing pumpability of concrete mixture

Abstract

The invention relates to a method for testing the pumpability of a concrete mixture, which comprises the following steps: 1) testing and calculating the total content of mortar in concrete and the density of the mortar; 2) calculating the content of the mortar filled in pebble gaps; 3) calculating the mass of the residual filled mortar by subtracting the mass of the mortar filled in pebble gaps from the total mass of the mortar; and 4) calculating the filling ratio of the residual mortar by dividing the mass of the residual filled mortar by the mass of the mortar filled in pebble gaps. Based on the conventional test for the slump, slump flow and the like of the concrete mixture, the invention provides a residual filled mortar content test method for testing the filling ratio of the residual mortar by taking the intimate relationship between the pumpability of the concrete and the content of the residual filled mortar in the concrete into consideration. The method can be used for quickly judging the pumpability of the concrete mixture on the construction site before the concrete mixture is put into the pumped, thereby better guiding the construction, avoiding pump tube blocking in the pumping process and increasing the working efficiency.

Description

technical field [0001] The invention relates to a test method for the pumpability of the concrete mixture, in particular to a concrete mixture pumpability test method for testing the sufficient mortar filling rate of the concrete mixture. Background technique [0002] At present, there are mainly two test methods used to check the pumpability of concrete. One is to conduct pre-site inspection by the concrete company before the concrete mixture leaves the site, including testing the slump and workability of the concrete. The pressure bleeding rate is also randomly checked, and the factory is delivered after passing the test; the second is to measure the slump, expansion and slump backflow time of the concrete before the concrete is put into the pump, and occasionally measure the pressure bleeding rate. Concrete mixtures that have passed the inspection or test are allowed to leave the factory or enter the pump. [0003] However, during the construction process, it is often fo...

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Problems solved by technology

[0003] However, during the construction process, it is often found that the pump pipe is blocked when the concrete is pumped according to the relevant specifications or standard test methods, and the concrete performance is tested and tested; especially when the concrete is poured downward or more than 100m When pouring, the pump pipe often gets blocked; the main reasons for this situation are: one is the concrete bleeding, and the other is that the concrete absorbs water under the pressure pumping and the concrete is dry

[0004] One of the indicators used to detect the pumpability of concrete mixtures is to detect the pressure bleeding rate of concrete, but the pressure bleeding rate test process is time-consuming and laborious, and under the action of pressure, due to water absorption by sand and stones, the test detection The results are inaccurate and the basis for judging the pumpability of the concrete mix is ​​not sufficient

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