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Method for producing steam-pressing silicate products by waste concrete

A waste concrete and silicate technology, applied in the field of building materials, can solve the problems of large drying shrinkage and low strength, and achieve the effects of simple equipment, high strength and environmental protection

Inactive Publication Date: 2006-09-13
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main raw materials used to manufacture new wall materials are fly ash, sand and cement, etc. The existing new wall materials generally have the problems of low strength and large dry shrinkage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Step 1, breaking the waste concrete into fragments below 50mm, and then grinding to a particle size below 2mm;

[0014] Step 2, add 25% (mass ratio) of ground quicklime (or corresponding amount of slaked lime) to the ground waste concrete fine particles and stir evenly, add a certain amount of water (water-solid ratio is 0.25, mass ratio), stir;

[0015] Step 3, molding the stirred mixture into adobe or plate under a pressure of 5 MPa, autoclaving at a constant temperature for 6 hours in an autoclave with a saturated vapor pressure of 1.3 MPa, and exiting the autoclave.

Embodiment 2

[0017] Step 1, crush the waste concrete into pieces below 50mm, and then grind until the specific surface area is greater than 300m 2 / kg powder;

[0018] Step 2, in the ground waste concrete powder (can be mixed with 10-80% mass ratio of fly ash, sand powder, steel slag powder or slag powder to replace waste concrete powder), add 0.8‰ (mass ratio) Aluminum powder, add a certain amount of water (water-solid ratio is 0.50, mass ratio), stir evenly, add 25% (mass ratio) of ground quicklime, stir evenly;

[0019] Step 3: inject the stirred mixture into the mould, stop for 2 hours, cut, and autoclave at a constant temperature for 6 hours in an autoclave with a saturated vapor pressure of 1.3 MPa, and then leave the autoclave.

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PUM

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Abstract

A silicate product (building aerocrete block, hollow building block, brick, or slab) is prepared from waste concrete, lime and selective powdered coal ash, sand and steel slags through crushing and grinding the waste concrete, mixing with others, and shaping under steam pressure.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a method for producing autoclaved silicate products by using an autoclave process with waste concrete as the main raw material. Background technique [0002] With the development of society and the improvement of economic level, urban construction, municipal administration, road construction and maintenance will produce a large amount of waste concrete. [0003] The traditional treatment of waste concrete is mainly dumping and backfilling. In foreign countries, the waste concrete obtained from the destroyed buildings is cleaned, and the waste concrete is recovered by crushing and used as aggregate of concrete. However, studies at home and abroad have found that when waste concrete is used as secondary aggregate in concrete, the density, workability, hardness, ultrasonic velocity and compressive strength of concrete will deteriorate. Chinese patent CN1107558C has also a...

Claims

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Application Information

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IPC IPC(8): C04B18/16C04B28/10
CPCY02W30/91
Inventor 柯昌君
Owner YANGTZE UNIVERSITY