CN103332949A - High-strength aerated concrete block and preparation method thereof - Google Patents

Abstract

The invention relates to a high-strength aerated concrete block and a preparation method thereof. The high-strength aerated concrete block is prepared by the following raw materials by weight: 25-30 parts of cement, 10-15 parts of quicklime, 12-15 parts of gypsum, 0.15-0.2 part of aluminum powder, 10-15 parts of propylene glycol, 3-5 parts of a polycarboxylate water reducing agent, 12-15 parts of saw dust,5-8 parts of oil residues, 3-5 parts of branch powder, 5-8 parts of clay, 3-5 parts of sodium persulfate, 30-35 parts of gravels and 4-6 parts of 3-aminopropyl trimethoxysilane. Cement consumption in the high-strength aerated concrete block is relatively large, and the polycarboxylate water reducing agent and the gravels are added, so that compressive strength of the block is obviously enhanced, thereby meeting actual production requirements.

Description

High strength air-entrained concrete building block and preparation method thereof

Technical field

The invention belongs to a kind of building material technique, specifically is a kind of concrete segment and preparation method thereof.

Background technology

Novel wall material gas concrete is as New Building Materials a kind of less energy-consumption, environment-friendly type, belong to the material of construction that country promotes, but because common gas concrete is made by cement, flyash, unslaked lime, gypsum etc., have that drying shrinkage value is big, intensity is low, infiltration, not corrosion-resistant, problem such as thermal insulation is not good, material source is single, therefore, urgent need is further studied for the air-entrained concrete building block technology, makes further to satisfy the requirement in market.

Summary of the invention

The purpose of this invention is to provide high strength air-entrained concrete building block and preparation method thereof, to solve the not high problem of intensity that present air-entrained concrete building block exists.

Technical solution of the present invention is as follows:

A kind of high strength air-entrained concrete building block is characterized in that being made by the raw material of following weight part: cement 25-30, unslaked lime 10-15, gypsum 12-15, aluminium powder 0.15-0.2, polyvinyl alcohol 10-15, polycarboxylate water-reducer 3-5, sawdust 12-15, oil foot 5-8, branch powder 3-5, clay 5-8, Sodium Persulfate 3-5, stone chippings 30-35,3-aminopropyl trimethoxysilane 4-6.

The preparation method of described high strength air-entrained concrete building block is characterized in that may further comprise the steps:

(1), sawdust, branch powder, clay are added suitable quantity of water, be heated to 80-90 ℃, stirred 20-30 minute, add oil foot, polyvinyl alcohol, stirred 15-25 minute, and added Sodium Persulfate then, stir after 30-45 minute, add the 3-aminopropyl trimethoxysilane and stirred 20-30 minute, stir into mud;

(2), cement, gypsum are added 90-100 ℃ of hot water mixing 15-25 minute, then, other materials such as the mud of adding step (1) gained and unslaked lime, aluminium powder, stone chippings, polycarboxylate water-reducer stirred 10-15 minute, obtained the slurry that water content is 30-35%;

(3), with slurry cast, send in the 40-60 ℃ of drying room after precuring 1.5-2.5 hour, cut into the building block base, be coated with the last layer dimethyl silicone oil at the outer wall of building block base;

(4), steam press maintenance in the still is sent in building block, vapor pressure 1-1.3Mpa, the steam-cured time 6-8.0h of constant voltage gets finished product.

The air-entrained concrete building block that the present invention produces, wherein adopt the oil foot composition, through the initiator modification, increased the hydrophobicity of building block, improved its infiltration ability greatly, building block of the present invention body of wall outside the residential quarter uses, last more than 3 years, do not find the wall leakage phenomenon, and adopt traditional air-entrained concrete building block that all have resident family infiltration to occur annual spring.Adopt among the present invention cement amount big, increased polycarboxylate water-reducer and stone chippings, obviously improved the ultimate compression strength of building block, satisfy needs of production.

The air-entrained concrete building block that the present invention produces has advantages such as ultimate compression strength height, light weight, sound insulation, heat insulation, good heat preservation performance, anti-freezing property and contraction thereof be little, has solved traditional air-entrained concrete building block intensity defective low, easy to crack.

Embodiment

A kind of high strength air-entrained concrete building block is made by the raw material of following weight part (kilogram): cement 25, unslaked lime 10, gypsum 15, aluminium powder 0.2, polyvinyl alcohol 15, polycarboxylate water-reducer 5, sawdust 12, oil foot 8, branch powder 5, clay 5, Sodium Persulfate 5, stone chippings 30,3-aminopropyl trimethoxysilane 4.

The preparation method of high strength air-entrained concrete building block is characterized in that may further comprise the steps:

(1), sawdust, branch powder, clay are added suitable quantity of water, be heated to 80-90 ℃, stirred 20-30 minute, add oil foot, polyvinyl alcohol, stirred 15-25 minute, and added Sodium Persulfate then, stir after 30-45 minute, add the 3-aminopropyl trimethoxysilane and stirred 20-30 minute, stir into mud;

(2), cement, gypsum are added 90-100 ℃ of hot water mixing 15-25 minute, then, other materials such as the mud of adding step (1) gained and unslaked lime, aluminium powder, stone chippings, polycarboxylate water-reducer stirred 10-15 minute, obtained the slurry that water content is 30-35%;

(3), with slurry cast, send in the 40-60 ℃ of drying room after precuring 1.5-2.5 hour, cut into the building block base, be coated with the last layer dimethyl silicone oil at the outer wall of building block base;

(4), steam press maintenance in the still is sent in building block, vapor pressure 1-1.3Mpa, the steam-cured time 6-8.0h of constant voltage gets finished product.

The cubes that the hollow brick that the present invention is produced cuts into 100mm * 100mm * 100mm carries out Performance Detection, and detected result is as follows: ultimate compression strength 6.98Mpa, shrinkage value 0.37mm/m, frost resistance loss of strength 14%.

Claims (2)

1. a high strength air-entrained concrete building block is characterized in that being made by the raw material of following weight part: cement 25-30, unslaked lime 10-15, gypsum 12-15, aluminium powder 0.15-0.2, polyvinyl alcohol 10-15, polycarboxylate water-reducer 3-5, sawdust 12-15, oil foot 5-8, branch powder 3-5, clay 5-8, Sodium Persulfate 3-5, stone chippings 30-35,3-aminopropyl trimethoxysilane 4-6.

2. the preparation method of high strength air-entrained concrete building block according to claim 1 is characterized in that may further comprise the steps:

(1), sawdust, branch powder, clay are added suitable quantity of water, be heated to 80-90 ℃, stirred 20-30 minute, add oil foot, polyvinyl alcohol, stirred 15-25 minute, and added Sodium Persulfate then, stir after 30-45 minute, add the 3-aminopropyl trimethoxysilane and stirred 20-30 minute, stir into mud;

(2), cement, gypsum are added 90-100 ℃ of hot water mixing 15-25 minute, then, other materials such as the mud of adding step (1) gained and unslaked lime, aluminium powder, stone chippings, polycarboxylate water-reducer stirred 10-15 minute, obtained the slurry that water content is 30-35%;

(3), with slurry cast, send in the 40-60 ℃ of drying room after precuring 1.5-2.5 hour, cut into the building block base, be coated with the last layer dimethyl silicone oil at the outer wall of building block base;

(4), steam press maintenance in the still is sent in building block, vapor pressure 1-1.3Mpa, the steam-cured time 6-8.0h of constant voltage gets finished product.