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A kind of foam concrete and preparation method thereof

A foamed concrete and concrete technology, applied in the field of building materials, can solve the problems of poor thermal insulation performance, high density and high cost, and achieve the effects of good durability and low material cost

Inactive Publication Date: 2011-11-30
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The sulphoaluminate cement foam concrete introduced by Chinese patent CN1887772A adopts special cement to prepare foam concrete, and the density grade is 300kg / m 3 above, but its cost is high, its durability is not good, its density is high, its thermal insulation performance is poor, and its application is limited.
A new type of foam concrete preparation process introduced by Chinese patent CN101973779A, the density grade is 700-1200kg / m 3 , the density is too high, and the thermal insulation performance is poor, so it can only be used in filling engineering occasions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Raw materials: PII52.5 Portland cement, hydrogen peroxide (mass concentration 30%), NJ physical foaming agent, CaCl 2 , polycarboxylate water reducer, water;

[0023] 2) Preparation of cement slurry: Weigh 160g of PII52.5 Portland cement, add water into the mixer according to the water-cement ratio of 0.54, and mix and stir, and the speed is controlled at 1000rpm;

[0024] 3) Mixing of foam stabilizer and early strength agent: add NJ physical foaming agent of 0.4% of cement quality and CaCl of 2% of cement quality 2 , mixed with cement slurry at medium speed (1000rpm) and stirred for 2min;

[0025] 4) Stirring of the mixed slurry: add polycarboxylate water reducing agent with 0.4% of cement mass and 10% of cement mass with hydrogen peroxide to mix with cement slurry, and stir at high speed (2500rpm) for 0.5min;

[0026] 5) Foam concrete pouring: pour the mixed cement slurry into the pre-prepared mold;

[0027] 6) static foaming;

[0028] 7) Curing at room tempera...

Embodiment 2

[0031] 1) Raw materials: PII52.5 Portland cement, hydrogen peroxide (mass concentration 15%), NJ physical foaming agent, aluminum sulfate, polycarboxylate water reducer, water;

[0032] 2) Preparation of cement slurry: Weigh 240g of PII52.5 Portland cement, add water into the mixer according to the water-cement ratio of 0.54, and mix and stir, and the speed is controlled at 1000rpm;

[0033] 3) Mixing of foam stabilizer and early strength agent: add NJ physical foaming agent of 0.4% of cement mass and aluminum sulfate of 1.8% of cement mass, mix with cement slurry at medium speed (1000rpm) and stir for 2min;

[0034] 4) Stirring of the mixed slurry: add polycarboxylate water reducer with 0.3% of cement mass and hydrogen peroxide with 16% of cement mass to mix with cement slurry, and stir at high speed (2500rpm) for 0.5min;

[0035] 5) Foam concrete pouring: pour the mixed cement slurry into the pre-prepared mold;

[0036] 6) static foaming;

[0037] 7) Curing at room tempera...

Embodiment 3

[0040] 1) Raw materials: PO42.5 ordinary Portland cement, hydrogen peroxide (mass concentration 30%), NJ physical foaming agent, water glass, polycarboxylate water reducer, water;

[0041]2) Preparation of cement slurry: Weigh 320g of PO42.5 ordinary Portland cement, add water into the mixer according to the water-cement ratio of 0.54, and mix and stir, and the speed is controlled at 1000rpm;

[0042] 3) Mixing of foam stabilizer and early strength agent: add NJ physical foaming agent of 0.5% of cement mass and water glass of 2% of cement mass, mix with cement slurry at medium speed (1000rpm) and stir for 2min;

[0043] 4) Stirring of the mixed slurry: add polycarboxylate water reducing agent with 0.5% of cement mass and 6.7% of cement mass with hydrogen peroxide and mix with cement slurry, and stir at high speed (2500rpm) for 0.5min;

[0044] 5) Foam concrete pouring: pour the mixed cement slurry into the pre-prepared mold;

[0045] 6) static foaming;

[0046] 7) Curing at ...

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Abstract

The invention relates to a foamed concrete and a preparation method thereof. The foamed concrete adopts a chemical foaming method, and a foam stabilizer, an early strength agent, and a water reducer are respectively added to ordinary Portland cement slurry and stirred evenly, and then chemical foaming agent is added. The foaming agent is fully stirred evenly, then injection molded, cured at room temperature, and hardened. The dry apparent density range of the foamed concrete prepared by this method is 150-300kg / m3, the corresponding compressive strength is 0.10-0.50MPa, and the thermal conductivity is lower than 0.10W / mK. It can be used as roof insulation project, floor heating project, light Cushion material, especially suitable for external wall insulation system, energy-saving composite panels, etc. used in building energy-saving projects.

Description

technical field [0001] The invention relates to a composition and a preparation method of a lightweight building material, in particular to an ultra-low density foam concrete and a preparation method thereof. The invention belongs to the technical field of building materials. Background technique [0002] Foamed concrete is a kind of cement-based porous light solid material that uses cement as the main raw material, introduces appropriate amount of air bubbles by means of chemical or physical foaming methods, and then pours, cures, and hardens. It has a series of superior properties such as moisture resistance, sound insulation, frost resistance, shock absorption and high fluidity of slurry, and is usually used in engineering occasions such as energy-saving insulation, noise control, high-rise buildings, shock absorption and buffering, and irregular space filling. [0003] The density of ordinary foam concrete generally fluctuates between 300-1500kg / m 3 There is a close re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
Inventor 潘志华秦璜
Owner NANJING UNIV OF TECH
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