Method for measuring pressure water absorption rate of lightweight aggregate concrete

Abstract

The invention provides a method for measuring pressure water absorption rate of lightweight aggregate concrete, comprising the steps of: evenly mixing concrete and lightweight aggregate; weighing CW g of evenly mixed concrete and lightweight aggregate and placing in a square hole sieve of 4.75mm, sieving out cement slurry, then weighing MW1 g of the sieved out cement slurry; putting the evenly mixed concrete and lightweight aggregate into a container provided with an air content meter, smashing and sealing tightly, then pumping air into the lightweight aggregate concrete by the air content meter for pressurizing until the pressure can not descend; re-weighing certain amount of pressurized CW g of lightweight aggregate concrete and placing in the square hole sieve of 4.75mm, sieving out cement slurry, then weighing MW2 g of the sieved out cement slurry; and calculating the water absorption rate R of the lightweight aggregate concrete by using the formula R=[(MW1-MW2) / CW]*100%. The technical scheme leads the lightweight aggregate to be in a saturate state before pumping, and can not appear thickening and drying of concrete to lose liquidity and plug pump tubes under the state of pumping.

Description

technical field [0001] The invention relates to a method for measuring pressure water absorption of lightweight aggregate concrete. Background technique [0002] Lightweight aggregate concrete is made of porous materials such as fly ash ceramsite, shale ceramsite, clay ceramsite, etc., and is prepared with Portland cement, water and admixtures (or without admixtures) according to the mix ratio requirements. of concrete. Lightweight aggregate concrete has the effect of light weight and heat preservation, and is used more and more in industrial and civil buildings; however, lightweight aggregate concrete is made of porous materials such as fly ash ceramsite, shale ceramsite, clay ceramsite, etc. The water absorption rate of these aggregates is relatively large, and the water absorption rate of lightweight aggregates will increase with the increase of pressure. Therefore, when pouring lightweight aggregate concrete by pumping, under the action of pumping pressure, the porous l...

AI Technical Summary

Problems solved by technology

Lightweight aggregate concrete has the effect of light weight and heat preservation, and is used more and more in industrial and civil buildings; however, lightweight aggregate concrete is made of porous materials such as fly ash ceramsite, shale ceramsite, clay ceramsite, etc. The water absorption rate of these aggregates is relatively large, and the water absorption rate of lightweight aggregates will increase with the increase of pressure. Therefore, when pouring lightweight aggregate concrete by pumping, under the action of pumping pressure, the porous lightweight Under the action of pump pressure, the aggregate will absorb water and cause the concrete to thicken and dry, lose fluidity and block the pump pipe; therefore, in the construction of general lightweight aggregate concrete, it is usually used to lift the lightweight aggregate concrete to the building This is one of the main reasons why lightweight aggregate concrete cannot be widely used

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