Method for measuring pressure water absorption rate of lightweight aggregate concrete

A technology of lightweight aggregate concrete and measurement method, which is applied in the direction of using material absorption and weighing, etc., can solve the problems of concrete thickening, losing fluidity, and drying out.

Active Publication Date: 2010-01-20
CHINA CONSTR EIGHT ENG DIV CORP LTD
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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

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  • Method for measuring pressure water absorption rate of lightweight aggregate concrete
  • Method for measuring pressure water absorption rate of lightweight aggregate concrete
  • Method for measuring pressure water absorption rate of lightweight aggregate concrete

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Embodiment Construction

[0015] Usually, light aggregate needs to be pre-soaked or pre-wetted in water before it is formally used for mixing concrete. Since it is soaked or pre-wetted under normal pressure, even if the light aggregate absorbs water saturated or basically stable, the pumping pressure Under the state of pressure, the lightweight aggregate will continue to absorb water until it is saturated with water under pressure. Therefore, how to measure the pressure water absorption rate of lightweight aggregate concrete under pump pressure is the key to achieving smooth pumping.

[0016] In order to solve the phenomenon of clogging and drying of lightweight aggregate concrete during pumping, the method for measuring water absorption of lightweight aggregate concrete under pressure can be used to measure the water absorption of lightweight aggregate concrete under pump pressure, thereby calculating The extra water absorption can be injected into the concrete before pumping the concrete, so as to av...

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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...

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Application Information

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IPC IPC(8): G01N5/02
Inventor 王桂玲张秀芳王龙志张海霞张会冰杜栋危鼎
Owner CHINA CONSTR EIGHT ENG DIV CORP LTD
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