Method of producing pump-transporting light aggregate concrete

A light-weight aggregate concrete and light-fine aggregate technology, which is applied in clay preparation devices, mixing operation control, chemical instruments and methods, etc., can solve problems such as large economic losses, blockage of pump pipes, and decreased performance of concrete mixtures.

Active Publication Date: 2008-03-05
WUHAN MUNICIPAL CONSTR GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the density of light aggregate is lower than that of cement stone, and the light aggregate is very easy to float to the concrete surface under the condition of improper proportion design or construction control
Moreover, the light aggregate will absorb water from the cement slurry during the pumping process, which will cause the performance of the concrete mixture to decline
The poor homogeneity of concrete and the water absorption of light aggregate under pressure make it easy to block the pump pipe during the pumping construction of light aggregate concrete, which will affect the construction progress and cause large economic losses

Method used

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  • Method of producing pump-transporting light aggregate concrete
  • Method of producing pump-transporting light aggregate concrete
  • Method of producing pump-transporting light aggregate concrete

Examples

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Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1: a kind of preparation method of pumping light aggregate concrete, it comprises the steps:

[0045]1) selection of raw materials: select water, cement, fly ash, light coarse aggregate, light fine aggregate, water reducing agent and pumping agent according to Table 1, wherein, described light coarse aggregate is 30 minutes water absorption rate Not more than 8% shale ceramsite, the particle size of shale ceramsite is 4.75-13.2mm; the light and fine aggregate is river sand, the particle size is 0.1-4.75mm;

[0046] The pumping agent is 0.8kg of cellulose ether, 0.1kg of polyethylene oxide, 5kg of lignin fiber, 1kg of sodium dodecylsulfonate, and 13kg of silica fume; the cellulose ether is methyl hydroxyethyl cellulose ether or Any of the methyl hydroxypropyl cellulose ethers, with a viscosity of 30000-50000mPa · S; the molecular weight of polyethylene oxide is 500,000-1,000,000; lignin fiber is flocculent lignin fiber; sodium dodecyl sulfonate is commerciall...

Embodiment 2

[0064] A preparation method for pumping lightweight aggregate concrete, comprising the steps of:

[0065] 1) selection of raw materials: select water, cement, fly ash, light coarse aggregate, light fine aggregate, water reducing agent and pumping agent according to table 4, wherein, described light coarse aggregate is 30 minutes water absorption Not more than 8% shale ceramsite, the particle size of shale ceramsite is 4.75-13.2mm; the light and fine aggregate is shale ceramsite, the particle size is 0.1-4.75mm, and the water absorption rate of ceramsite is less than 20%;

[0066] The pumping agent is 1kg of cellulose ether, 0.2kg of polyethylene oxide, 10kg of lignin fiber, 1.5kg of sodium dodecylsulfonate, and 15kg of silica fume; the cement is Portland cement; the cellulose ether is methyl Either of hydroxyethyl cellulose ether or methyl hydroxypropyl cellulose ether, with a viscosity of 30,000-50,000mPa · S; the molecular weight of polyethylene oxide is 500,000-1,000,000; ...

Embodiment 3

[0079] A preparation method for pumping lightweight aggregate concrete, comprising the steps of:

[0080] 1) Selection of raw materials: select water, cement, fly ash, light coarse aggregate, light fine aggregate, water reducer and pumping agent according to Table 7; wherein, the light coarse aggregate is 30 minutes water absorption Not more than 8% shale ceramsite, the particle size of shale ceramsite is 4.75-13.2mm; the light fine aggregate is shale ceramsite, the particle size of shale ceramsite is 0.1-4.75mm, Sand water absorption is less than 20%;

[0081] The pumping agent is cellulose ether 1.1kg, polyoxyethylene 0.4kg, sodium lauryl sulfonate 0.5kg, lignin fiber 3kg, silica fume 15kg; Cement and fly ash constitute the cementitious material of the present invention, and cement is Ordinary Portland cement; the water demand ratio of fly ash is not more than 100%; the cellulose ether is any one of methyl hydroxyethyl cellulose ether or methyl hydroxypropyl cellulose ether...

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Abstract

The process of preparing light aggregate concrete suitable for pumping includes the following steps: 1. preparing materials including water 158-163 kg / cu m, cement 209-382 kg / cu m, fly ash 163-315 kg / cu m, light coarse aggregate 373-648 kg / cu m, light fine aggregate 292-526 kg / cu m, water reducing agent 3.49-4.48 kg / cu m, and pumping agent 1.12-3.49 kg / cu m, with the pumping agent comprising cellulose ether 8-12 weight portions, polyethylene oxide 1-5 weight portions, lignin fiber 30-100 weight portions, sodium dodecyl sulphonate 5-15 weight portions, and silica fume 100-300 weight portions; and 2. mixing the said materials through stirring for over 3 min to obtain the light aggregate concrete suitable for pumping. The light aggregate concrete suitable for pumping has high pumping performance, and less delamination, weepage and segregation.

Description

technical field [0001] The invention relates to a method for preparing lightweight aggregate concrete suitable for pumping. technical background [0002] With the rapid development of my country's construction industry and the acceleration of infrastructure construction, lightweight aggregate concrete is widely used in various non-load-bearing structures and main load-bearing structures due to its light weight, high strength, thermal insulation, sound insulation, and earthquake resistance. The development of lightweight aggregate concrete is considered to be the main way to reduce the weight of the structure and make the concrete develop in the direction of light weight and high strength. [0003] However, the density of light aggregate is lower than that of cement stone, and light aggregate is very easy to float to the surface of concrete under the condition of improper proportion design or construction control. Moreover, the light aggregate will absorb water from the ceme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28C7/04B28C5/00
CPCC04B40/0039C04B2111/00146C04B28/02C04B2103/34Y02W30/91C04B18/027C04B18/08C04B20/0096C04B40/0028C04B2103/302C04B14/06C04B16/0675C04B18/146C04B24/10C04B24/281C04B24/383
Inventor 胡曙光丁庆军王发洲王涛周宇飞
Owner WUHAN MUNICIPAL CONSTR GROUP
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