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A kind of foam concrete with low water absorption rate and preparation method thereof

A technology of foamed concrete and low water absorption, which is applied in the field of foamed concrete with low water absorption and its preparation, which can solve the problems of high cost and achieve the effects of improving consistency, reducing floating, and uniform distribution of air bubbles

Inactive Publication Date: 2017-02-15
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the water absorption of foamed concrete is mainly reduced by adding water-repellent agents (emulsified paraffin, silicone, etc.), but this method has the disadvantage of high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of foam concrete with low water absorption rate is prepared as follows:

[0026] (1) Weigh 70 parts (parts by weight, the same below) of P.O42.5 ordinary Portland cement, 10 parts of sulphoaluminate cement, 0.3 parts of polyacrylamide, 0.3 parts of sodium hydroxymethyl cellulose, 0.1 parts Polycarboxylate superplasticizer, 0.3 parts of lithium carbonate, 20 parts of water and 0.06 parts of animal protein foaming agent;

[0027] (2) Dilute the foaming agent according to the foaming agent: water weight ratio of 1:50 to form a foaming agent solution, then use an air compressor to add compressed air to the foaming agent solution to generate bubbles, and set aside;

[0028] (3) Add the weighed ordinary Portland cement, sulphoaluminate cement, thickener, water reducer, foam stabilizer and quick-setting agent into the mixing pot, stir for 30 seconds, and then add the weighed water (deducting the prepared The water required for the foaming agent solution) was added and ...

Embodiment 2

[0034] A kind of foamed concrete with low water absorption rate, the distribution ratio of each component is calculated in parts by weight: 60 parts of P.O42.5 ordinary Portland cement, 10 parts of sulphoaluminate cement, 0.1 part of polyacrylamide, 0.2 part Polyoxyethylene fatty alkanolamine, 0.1 part of polycarboxylate superplasticizer, 0.3 part of lithium carbonate, 30 parts of water and 0.07 part of animal protein foaming agent.

[0035] The preparation method is the same as in Example 1. The foamed concrete prepared in this example is poured into two sets of 70×70×70mm triple molds respectively. After curing for 28 days, its performance is tested. The result is: the open porosity is 42%, and the water absorption The ratio is 23%, and the bulk density of the six foamed concrete test blocks is 5.8kN / m 3 、5.8kN / m 3 、5.9kN / m 3 、6.0kN / m 3 、6.1kN / m 3 、6.1kN / m 3 , The compressive strength is 2.13MPa, 2.20MPa, 2.40MPa, 2.55MPa, 2.66MPa, 2.65MPa respectively.

[0036] Compar...

Embodiment 3

[0039] A kind of foamed concrete with low water absorption rate, the distribution ratio of each component is calculated in parts by weight: 35 parts of P.O42.5 ordinary Portland cement, 5 parts of sulphoaluminate cement, 20 parts of sandy soil (the largest grain Diameter is 4mm), 0.2 parts of hydroxyethyl cellulose, 0.3 parts of sodium hydroxymethyl cellulose, 0.1 part of polycarboxylate superplasticizer, 0.5 parts of lithium carbonate, 40 parts of water and 0.07 parts of rosin soap foaming agent.

[0040]The preparation method is the same as in Example 1. The foamed concrete prepared in this example is poured into two sets of 70×70×70mm triple molds respectively. After curing for 28 days, its performance is tested. The result is: the open porosity is 45%, The water absorption rate of the foam concrete is 24%, and the bulk density of the 6 foam concrete test blocks is 7.9kN / m 3 、8.0kN / m 3 、8.0kN / m 3 、8.1kN / m 3 、8.2kN / m 3 、8.1kN / m 3 , The compressive strength is 2.57MPa, 2...

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Abstract

The invention relates to a low-water-absorption foamed concrete and a preparation method thereof. The low-water-absorption foamed concrete is prepared from ordinary Portland cement, sulphoaluminate cement, raw material soil, water, a thickening agent, a water-reducing agent, a foam-stabilizing agent, an accelerator and a foaming agent. Through addition of the sulphoaluminate cement and the accelerator which can accelerate coagulation of the ordinary Portland cement, break of bubbles during an initial setting time is reduced and an opening porosity and water absorption of the foamed concrete are reduced. Through addition of the thickening agent, thickness of the foamed concrete can be adjusted and upward-floating of the bubbles is reduced so that the bubble is distributed uniformly. The foamed concrete is low in water absorption, is uniform in volume weight, is stable in compressive strength and has a better thermal-insulation and temperature-preserving performance, a better mechanical performance and a better freeze-thaw-destroy resistant performance.

Description

technical field [0001] The invention specifically relates to a low water absorption foamed concrete and a preparation method thereof. Background technique [0002] Foamed concrete is a lightweight material with a tiny pore structure prepared by mixing cement, raw soil, water and air bubbles. Foamed concrete has the advantages of light bulk density, good thermal insulation, and adjustable strength, and has important application prospects in building insulation and soft soil roadbed reinforcement. However, during the initial setting process of foamed concrete, the bubbles are easily broken to form interconnected pores, which increases the porosity of the foamed concrete opening and the water absorption rate. The upper and lower layers have different volumetric densities. Obviously, the longer the initial setting time of foamed concrete, the more serious the phenomenon of bubble breakage. When foamed concrete is used as insulation material, the high water absorption rate wil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/10C04B28/06
Inventor 余剑英章灿林赵满喜谢云飞杨光周吉
Owner WUHAN UNIV OF TECH
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