Large-dosage fly ash concrete and preparation method thereof

A fly ash and concrete technology, applied in the field of concrete and civil construction materials, can solve the problems of low chemical activity and low strength, and achieve the effects of promoting dispersion and reaction, improving strength and increasing specific surface area

Active Publication Date: 2018-01-19
南京平达绿色建材科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a kind of large-volume fly ash concrete and its preparation method, utilize roasted bentonite and attapulgite, organic and inorganic activator and surfactant to make a kind of large-volume fly ash concrete Functionally modified synergist, used in combination with early-strength polycarboxylate superplasticizer, can stimulate the fly ash and mineral powder components with low chemical activity through various means, and realize the optimization of the chemical properties of fly ash and mineral powder. Activated, overcomes the defect of low early strength of large-volume fly ash concrete, has the effect of internal water diversion, and is beneficial to the maintenance process of concrete

Method used

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  • Large-dosage fly ash concrete and preparation method thereof

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Effect test

Embodiment 1

[0028] The preparation method of the modified reinforcing agent is as follows: (1) the mixture of 6.67 kg of bentonite and 3.33 kg of attapulgite is dried and dehydrated at 150 degrees Celsius, and then calcined and activated at 400 degrees Celsius for 6 hours; (2) the bentonite and attapulgite are activated for 6 hours; The soil mixture is uniformly mixed with 2kg sodium sulfate and 2kg calcium hydroxide powder; (3) 1.12kg triethanolamine maleate and 1.12kg calcium lignosulfonate are dissolved in 3.3 g of water and configured into a solution, and under stirring conditions, this The solution is evenly added to the mixture of sodium sulfate, calcium hydroxide and soil, and the mixture is continued to stir for 10 minutes, and then allowed to stand for 6 hours to form a multifunctional modified reinforcing agent for large-volume fly ash concrete.

[0029] Add 140kg PO 42.5 ordinary Portland cement, 265kg secondary fly ash, 45kg slag powder, 50kg modified reinforcing agent, 1010kg ...

Embodiment 2

[0031] The preparation method of the modified reinforcing agent is as follows: (1) the mixture of 5.00kg bentonite and 5.00kg attapulgite is dried and dehydrated under the condition of 150 degrees Celsius, and then calcined and activated at 600 degrees Celsius for 3 hours; (2) the bentonite and attapulgite are activated for 3 hours; The soil mixture is uniformly mixed with 2kg sodium sulfate and 2kg calcium hydroxide powder; (3) 1.12kg triethanolamine maleate and 1.12kg calcium lignosulfonate are dissolved in 3.3 g of water and configured into a solution, and under stirring conditions, this The solution is evenly added into the mixture of sodium sulfate, calcium hydroxide and soil, and the mixture is continued to stir for 10 minutes, and then allowed to stand for 9 hours to make a multifunctional modified reinforcing agent for large-volume fly ash concrete.

[0032] Add 170kg PO 42.5 ordinary Portland cement, 215kg secondary fly ash, 55kg slag powder, 45kg modified reinforcing ...

Embodiment 3

[0034] The preparation method of the modified reinforcing agent is as follows: (1) the mixture of 3.33 kg of bentonite and 6.67 kg of attapulgite is dried and dehydrated at 150 degrees Celsius, and then calcined and activated at 800 degrees Celsius for 2 hours; (2) the bentonite and attapulgite are activated for 2 hours; The soil mixture is uniformly mixed with 2kg sodium sulfate and 2kg calcium hydroxide powder; (3) 1.12kg triethanolamine maleate and 1.12kg calcium lignosulfonate are dissolved in 3.3 g of water and configured into a solution, and under stirring conditions, this The solution is evenly added to the mixture of sodium sulfate, calcium hydroxide and soil, and the mixture is continued to stir for 10 minutes, and then allowed to stand for 6 hours to form a multifunctional modified reinforcing agent for large-volume fly ash concrete.

[0035] 190kg PO 42.5 ordinary Portland cement, 195kg secondary fly ash, 65kg slag powder, 40kg modified reinforcing agent, 1100kg grav...

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Abstract

The invention provides large-dosage fly ash concrete and a preparation method thereof. The large-dosage fly ash concrete is prepared from the following raw materials: cement, fly ash, mineral powder,gravel, river sand, water, a modified reinforcing agent and a polycarboxylate superplasticizer, wherein the modified reinforcing agent is prepared from bentonite, attapulgite, lignosulfonate, sodium sulfate, calcium hydroxide, triethanolamine maleate and water. The preparation method comprises the following steps: adding the cement, the mineral powder, the fly ash, the modified reinforcing agent,the gravel and the river sand into a mixer; performing dry mixing for 30-40min; adding the water and the superplasticizer into the mixer; mixing for 10-15min to obtain the large-dosage fly ash concrete. According to the large-dosage fly ash concrete and the preparation method thereof provided by the invention, a multifunctional modified synergistic for large-dosage fly ash concrete is prepared from the roasted bentonite together with attapulgite, organic and inorganic activators and a surfactant; by combining the multifunctional modified synergistic with an early-strength polycarboxylate superplasticizer, the aim of improving the strength, compactness and durability of the large-dosage fly ash concrete can be achieved.

Description

technical field [0001] The invention belongs to the technical field of concrete and civil building materials, and particularly relates to a large-volume fly ash concrete and a preparation method thereof. Background technique [0002] As a basic building material, concrete plays an important role in my country's economic construction and social progress. Concrete is composed of cement, sand, gravel and water reducer. The production of concrete cementitious materials is due to high energy consumption and high carbon emissions. There are serious environmental pollution problems with dust emissions. The production of cement requires a large amount of non-renewable resources such as limestone and coal, and the cost is relatively high. Ordinary cement concrete has high compressive strength and high stiffness, but it has shortcomings such as easy shrinkage and cracking during the cementation and hardening process, low flexural strength, poor toughness, and small ultimate elongation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
Inventor 何辉徐中华邱阿莲陶小福
Owner 南京平达绿色建材科技有限公司
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