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Ultra-low-density foam concrete and preparation method thereof

A foam concrete and ultra-low density technology, applied in the field of building materials, can solve the problems of poor thermal insulation performance, high density, slow hardening speed, etc., and achieve the effect of good thermal insulation effect, low thermal conductivity, and convenient construction requirements

Inactive Publication Date: 2011-08-17
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The sulphoaluminate cement foam concrete introduced by Chinese patent CN1887772A adopts a physical method to prepare foam concrete, and the density grade is 300kg / m 3 Above, but its density is high, thermal insulation performance is poor, and its application is limited
The preparation method of foamed concrete introduced by patent CN101497533A has complex production process, slow hardening speed, and is prone to problems such as collapse and settlement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Raw materials: 42.5 grade rapid hardening sulfoaluminate cement, HP (mass concentration 10%), FS (NJFA), water;

[0024] 2) Preparation of cement slurry: Weigh 135g of sulfoaluminate cement, add water into the mixer according to the water-cement ratio of 0.56, and mix and stir, and the speed is controlled at 800rpm;

[0025] 3) Foam stabilizer mixing: add 0.3% FS of cement mass, mix with cement slurry at low speed (1000rpm) and stir for 2min;

[0026] 4) Stirring of the mixed slurry: add HP with a cement mass of 19.56%, mix with the cement slurry and stir at high speed (2500rpm) for 0.5min;

[0027] 5) Foamed concrete casting: inject the stirred foamed concrete slurry into the mould;

[0028] 6) static foaming;

[0029] 7) Natural conservation;

[0030] Determination of the apparent dry density of foam concrete is 130kg / m 3 , the compressive strength is 0.12MPa, and the thermal conductivity is 0.05W / m·K.

Embodiment 2

[0032] 1) Raw materials: 42.5 grade rapid hardening sulfoaluminate cement, HP (mass concentration 30%), FS (NJFA), water;

[0033] 2) Preparation of cement slurry: Weigh 150g of sulfoaluminate cement, add water into the mixer according to the water-cement ratio of 0.56, and mix and stir, and the speed is controlled at 800rpm;

[0034] 3) Foam stabilizer mixing: add 0.3% FS of cement mass, mix with cement slurry at low speed (1000rpm) and stir for 2min;

[0035] 4) Stirring of the mixed slurry: add 8% HP of cement mass, mix with the cement slurry and stir at high speed (2600rpm) for 0.6min;

[0036] 5) Foamed concrete casting: inject the stirred foamed concrete slurry into the mould;

[0037] 6) static foaming;

[0038] 7) Natural conservation;

[0039] Determination of the apparent dry density of foam concrete is 136kg / m 3 , the compressive strength is 0.14MPa, and the thermal conductivity is 0.06W / m·K.

Embodiment 3

[0041] 1) Raw materials: 42.5 grade rapid hardening sulfoaluminate cement, HP (mass concentration 20%), FS (NJFA), water;

[0042] 2) Preparation of cement slurry: Weigh 180g of sulfoaluminate cement, add water into the mixer according to the water-cement ratio of 0.54 and mix, and the speed is controlled at 900rpm;

[0043] 3) Foam stabilizer mixing: add 0.4% FS of cement mass, mix with cement slurry at low speed (1200rpm) and stir for 2min;

[0044] 4) Stirring of the mixed slurry: add 9% HP of cement mass, mix with the cement slurry and stir at high speed (3000rpm) for 0.5min;

[0045] 5) Foamed concrete casting: inject the stirred foamed concrete slurry into the mould;

[0046] 6) static foaming;

[0047] 7) Natural conservation;

[0048] Determination of the apparent dry density of foam concrete is 150kg / m 3 , the compressive strength is 0.18MPa, and the thermal conductivity is 0.08W / m·K.

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Abstract

The invention relates to ultra-low-density foam concrete and a preparation method thereof. The foam concrete is formed by mixing cement, a chemical foaming agent, a foam stabilizer and water in a mass ratio of (130-180):(10.3-15.2):(0.1-1.8):(60-90). The ultra-low-density foam concrete is prepared in a chemical foaming manner by the steps of: adding the foam stabilizer into sulfate aluminum cement slurry, stirring the slurry uniformly, then adding the chemical foaming agent, fully stirring the slurry and performing injection molding and natural curing. The dry apparent density of the ultra-low-density foam concrete prepared with the method is 130 to 150kg / m<3>, the compressive strength is more than 0.10MPa, and the heat conduction coefficient is less than 0.10W / mK; and the ultra-low-density foam concrete can be used as a material for roof heat preservation engineering, floor heating engineering and lightweight cushion layers, and is particularly suitable for an outer wall heat preservation system, an energy-saving composite board and the like.

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 porous concrete with a large number of closed pores inside, which is formed by introducing an appropriate amount of tiny air bubbles into cement slurry or cement mortar, stirring evenly and then hardening. It has light weight, heat preservation, sound insulation, frost resistance, shock absorption and high slurry A series of superior properties such as fluidity are 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 foam concrete generally fluctuates from 300-1500kg / m 3 There is a close relationship betwe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B28/36B28B1/14
CPCC04B28/065C04B38/10C04B40/0032C04B2103/48C04B22/068C04B2103/40C04B24/34
Inventor 潘志华秦璜
Owner NANJING UNIV OF TECH
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