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C60 pumping concrete and preparation method thereof

A technology for pumping concrete and machine-made sand, which is applied in the field of concrete, and can solve the problems of reducing the encapsulation of cementitious materials on aggregates, affecting the compressive strength of concrete, reducing the workability of concrete, etc., and achieving improved encapsulation and good encapsulation , Improve the effect of particle shape difference

Active Publication Date: 2020-05-15
重庆华西易通建设股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the large amount of fine aggregate and coarse aggregate in concrete, generally, the raw materials such as coarse aggregate and fine aggregate of concrete raw materials in various regions are all obtained locally, and due to the large amount of river sand in the Sichuan-Chongqing area The fineness is relatively fine, while the surface of the machine-made sand is rough and the gradation is poor; the particle shape of the gravel is poor, mostly broken pebbles, and the needle-like flake stones are relatively high, which not only reduces the workability of concrete, but also poor The aggregate gradation also affects the compressive strength of concrete; and in order to improve the workability of concrete mixture, it is necessary to reduce the viscosity of concrete mixture and improve the fluidity of concrete mixture, but for gradation Poor aggregate, there will be a central rockfill, which reduces the encapsulation of the cementitious material on the aggregate

Method used

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  • C60 pumping concrete and preparation method thereof

Examples

Experimental program
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Effect test

preparation example 1

[0038] Preparation example 1 of slump-retaining agent: ①Take 160kg of isopentenol polyoxyethylene ether, 20kg of 1,4-butanediol vinyl ether and 200kg of water, heat it to 60°C, and keep stirring for 10 minutes to obtain the mixture A;

[0039] ② Take 4kg of acrylic acid, 20kg of hydroxyethyl acrylate and 50kg of an aqueous solution of 1wt% sodium persulfate, and mix them uniformly to obtain a mixed solution B;

[0040] ③Add 2kg of thioglycolic acid, 0.5kg of sodium methacrylate hydroxypropyl sulfonate, 0.5kg of ethylene glycol dimethacrylate and 0.3kg of sodium isopropylxanthate to the mixture A, and keep it warm at 60°C After stirring for 5 minutes, add 50kg of 1wt% sodium persulfate aqueous solution dropwise while stirring, and the dropwise addition is completed within 30 minutes; agent mother liquor;

[0041] ④Add 20wt% aqueous solution of sodium hydroxide to the mother liquor of the slump-preserving agent, adjust the pH to 6, and obtain the slump-retaining agent with a so...

preparation example 2

[0042] Preparation example 2 of slump-retaining agent: ①Take 170kg of prenol polyoxyethylene ether, 25kg of 1,4-butanediol vinyl ether and 250kg of water, heat it to 65°C, and keep stirring for 15 minutes to obtain the mixed solution A;

[0043] ② Take 5kg of acrylic acid, 22.5kg of hydroxyethyl acrylate and 55kg of an aqueous solution of 1wt% sodium persulfate, and mix them uniformly to obtain a mixed solution B;

[0044] ③Add 3kg of thioglycolic acid, 0.75kg of sodium methacrylate hydroxypropyl sulfonate, 0.75kg of ethylene glycol dimethacrylate and 0.4kg of sodium isopropylxanthate to the mixture A, and keep it warm at 65°C After stirring for 7.5min, add dropwise an aqueous solution of 55kg of 1wt% sodium persulfate while stirring, and complete the dropwise addition within 30min; Slump retaining agent mother liquor;

[0045] ④Add 20wt% sodium hydroxide aqueous solution to the slump retaining agent mother liquor, adjust the pH to 6.5, and obtain a slump retaining agent with...

preparation example 3

[0046] Preparation example 3 of slump-retaining agent: ①Take 180kg of isopentenol polyoxyethylene ether, 30kg of 1,4-butanediol vinyl ether and 300kg of water, heat it to 70°C, keep stirring for 20min, and obtain the mixture A;

[0047] ② Take 6kg of acrylic acid, 25kg of hydroxyethyl acrylate and 60kg of an aqueous solution of 1wt% sodium persulfate, and mix them uniformly to obtain a mixed solution B;

[0048] ③Add 4kg of thioglycolic acid, 1kg of sodium methacrylate hydroxypropyl sulfonate, 1kg of ethylene glycol dimethacrylate and 0.5kg of sodium isopropylxanthate to the mixture A, and keep stirring at 70°C for 10 minutes Finally, dropwise add 60 kg of 1wt% sodium persulfate aqueous solution while stirring, and finish the dropwise addition within 30 minutes; then finish adding the mixed solution B dropwise while stirring, finish the dropwise addition within 1 hour, continue the heat preservation reaction for 1.5 hours, and obtain the slump retaining agent Mother liquor;

...

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Abstract

The invention discloses C60 pumping concrete and a preparation method thereof. According to the technical scheme, the C60 pumping concrete is characterized by being prepared from the following components in parts by weight: 400 to 420 parts of cement, 130 to 150 parts of an admixture, 690 to 710 parts of a fine aggregate, 960 to 980 parts of a coarse aggregate, 8 to 10 parts of an admixture and 160 to 170 parts of water, wherein the fine aggregate is formed by mixing river sand and machine-made sand in a weight ratio of 3:7, the fineness modulus of the river sand is 0.9-1.1, and the fineness modulus of the machine-made sand is 2.8-2.9; the coarse aggregate is formed by mixing large pebbles and small pebbles in a weight ratio of 6.5:3.5, the particle size of the large pebbles is 10-20 mm, the mud content of the large pebbles is smaller than 0.5%, the particle size of the small pebbles is 5-10 mm, and the mud content of the small pebbles is smaller than 0.6%. The pumping concrete has theadvantages of being high in compressive strength, good in workability and high in pumping height.

Description

technical field [0001] The invention relates to the technical field of concrete, more specifically, it relates to a C60 pumping concrete and a preparation method thereof. Background technique [0002] Ordinary concrete refers to the artificial stone made of cement as the main cementitious material, mixed with water, sand, stones, chemical admixtures and mineral admixtures in an appropriate proportion, after uniform mixing, compact molding and curing hardening. Pumped concrete refers to the concrete whose slump of the concrete mixture is not less than 100mm and the concrete pump is used to transport the mixture through the pipeline. [0003] In the prior art, the Chinese patent whose authorized notification number is CN102701682B discloses a pumped concrete, a pumped concrete prefabricated pile and a production method thereof. The raw materials of the pumped concrete include: cementitious material, fine aggregate, coarse aggregate, water reducing agent and water, wherein the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/00146C04B2201/50C04B18/08C04B18/141C04B18/146C04B14/02C04B14/06C04B24/32C04B24/023C04B24/04C04B24/06C04B22/14C04B24/16C04B24/045C04B22/062C04B24/10C04B22/16C04B24/003C04B2103/302
Inventor 刘成文肖波曾昌洪张建勇李斌梁治雷华魁冯斌刘先亮
Owner 重庆华西易通建设股份有限公司
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