Autoclaved aerated concrete block produced from sludge and carbide slag

A concrete block, autoclaved and aerated technology, which is applied in the field of environmental protection and wall materials, can solve the problems of limited product transportation distance, low added value, and difficult to guarantee durability, so as to broaden the range of raw materials and reduce the cost of raw materials , The effect of management cost promotion

Inactive Publication Date: 2018-04-27
HANCHUAN XINXIN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The added value of the above-mentioned building materials is relatively low, which limits the transportation distance of the product, and makes it difficult for carbide slag to be consumed and utilized in large quantities
In addition, calcium carbide slag contains high magnesium and is used to prepare cement products or lime-sand bricks, and its durability is difficult to guarantee
[0005] The invention uses calcium carbide slag to prepare autoclaved aerated concrete blocks, so that the active components in the raw materials can fully react under autoclaved conditions, and overcome the problems of high magnesium content and insufficient heat insulation of lime-sand brick wall materials , and give full play to the characteristics of light weight, heat preservation, heat insulation, sound absorption, fire prevention, and easy processing of aerated concrete to provide an energy-saving wall material. Therefore, sludge and carbide slag are two major pollution sources affecting the urban environment. Using them to produce eco-environmental materials is in line with the development direction of circular economy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] (1) Carry out grinding after drying each raw material, carbide slag is ground to specific surface area 681.7kg / m2; Sludge is ground to specific surface area 562.2kg / m2; Silica sand is ground to specific surface area 999.7kg / m2; Natural gypsum Grinding to a specific surface area of ​​400kg / m2; grinding of cement clinker to a specific surface area of ​​380kg / m2. (2) The raw materials prepared in step (1) are prepared according to 30% carbide slag, 35% sludge, 20% silica sand, 10% cement clinker, and 5% natural gypsum ingredients according to the dry basis weight percentage, plus accounting for the total amount of the above mixed dry materials. 0.75% water reducing agent by mass and 48C warm water accounting for 40% of the total mass of the mixed dry material, stirred for 120 seconds, then added 0.07% aluminum powder and stirred for 40 seconds to obtain aerated concrete mixed slurry, pouring of the slurry The temperature is 45°C. (3) Pouring the mixed slurry in step (2), ...

Embodiment 2

[0013] (1) Grinding after each raw material is dried, calcium carbide slag is ground to specific surface area 561.6kg / m ; Sludge is ground to specific surface area 562.2kg / m ; Silica sand is ground to specific surface area 999.7kg / m ; The natural gypsum is ground to a specific surface area of ​​400kg / m2; the cement clinker is ground to a specific surface area of ​​300kg / m2. (2) The raw materials prepared in step (1) are prepared according to 30% carbide slag, 30% sludge, 25% silica sand, 10% cement clinker, and 5% natural gypsum ingredients according to the dry basis weight percentage, plus accounting for the total amount of the above mixed dry materials. Quality 0.6% water reducer and 53°C warm water accounting for 41.5% of the total mass of the mixed dry material were stirred for 120 seconds, then 0.12% aluminum powder was added and stirred for 40 seconds to obtain the aerated concrete mixture slurry, The pouring temperature of the slurry is 45°C. (3) Pouring the mixed slur...

Embodiment 3

[0015] (1) Grinding after each raw material is dried, carbide slag is ground to specific surface area 653.4kg / m2; Sludge is ground to specific surface area 542.7kg / m2; Silica sand is ground to specific surface area 887.4kg / m2; Natural gypsum Grinding to a specific surface area of ​​400kg / m2; grinding of cement clinker to a specific surface area of ​​380kg / m2. (2) The raw materials prepared in step (1) are prepared according to the dry basis weight percentage according to 30% of calcium carbide slag, 40% of sludge, 19% of silica sand, 6% of cement clinker, and 5% of natural gypsum. 0.85% water reducer by mass and 50°C warm water accounting for 40% of the total mass of the mixed dry material, stirred for 120 seconds, then added 0.1% aluminum powder and stirred for 40 seconds to obtain aerated concrete mixed slurry, slurry The pouring temperature is 45°C. (3) Pouring the mixed slurry in step (2), stopping to generate gas, pre-curing, cutting, and autoclaving to obtain the finish...

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Abstract

The invention relates to an autoclaved aerated concrete block prepared by using sludge and carbide slag, which belongs to the field of environmental protection and the field of building materials. The raw materials and various raw materials required for preparing the autoclaved aerated concrete block are proportioned by weight percentage as calcium carbide slag 25-45%, sludge 25-35%, silica sand 15-30%, and cement clinker 6-12%. , 3-6% of natural gypsum ingredients, plus 0.6-0.9% of the total mass of the above mixed dry material water reducing agent, 0.06%-0.12% of aluminum powder and 35%-45% of 48 ℃ ~ 55 ℃ warm water. The wet compressive strength of the aerated concrete block prepared by the present invention reaches more than 3.5MPa, the absolute dry compressive strength reaches more than 5MPa, and the dry bulk density is 550kg/m3~650kg/m3, which meets the national standard for autoclaved aerated concrete masonry. According to the requirements of block performance indicators, it opens up a new way of utilization for the difficult-to-use sludge and carbide slag resources, which is conducive to solving the problems of sludge and carbide slag stockpiling occupying land resources and polluting the environment.

Description

technical field [0001] The invention belongs to the fields of environmental protection and wall materials, and in particular relates to an autoclaved aerated concrete block prepared from sludge and carbide slag. Background technique [0002] Autoclaved aerated concrete block is currently the only single wall material that can achieve 50% building energy saving. It has the characteristics of light weight, heat preservation, heat insulation, sound absorption, fire prevention, and easy processing. In view of these characteristics, under the background that the country prohibits the use of clay bricks, autoclaved aerated concrete blocks are occupying a growing market as wall materials. At present, there are mainly air concrete products prepared by two raw material systems of lime_cement_sand and lime_cement_fly ash in circulation in the market in our country. Because it plays an important role in the field of concrete and its supply is becoming increasingly tense, it is bound t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B28/00C04B111/40
CPCC04B28/00C04B2111/40C04B2201/20C04B2201/32C04B2201/50C04B18/0427C04B18/0418C04B14/06C04B14/365C04B22/04C04B38/02
Inventor 刘建军刘通
Owner HANCHUAN XINXIN TECH
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