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Water permeable brick prepared by using natural zeolite and steel slags as raw materials

A technology of natural zeolite and permeable bricks, applied in ceramic products, sustainable waste treatment, solid waste management, etc., can solve problems such as difficulty in direct utilization, cracking of brick bodies, affecting the volume stability of bricks, etc., to improve volume stability , the effect of large specific surface area and rich pore structure

Active Publication Date: 2020-03-06
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, steel slag contains a relatively high proportion of free calcium oxide (f-CaO), which swells when exposed to water, which affects the volume stability of bricks, and even causes bricks to crack, making it difficult to use directly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take 13kg of finely ground steel slag, 47kg of cement, 10.95kg of natural zeolite, 26kg of sand, 3kg of sodium tartrate, and 7kg of water, and mix them as raw materials for brick making. Among them, the average particle size of finely ground steel slag is 0.05mm, and the specific surface area is 350m 2 / g, the f-CaO content is 2%; the average particle size of natural zeolite is 1.6mm, and the specific surface area is 300m 2 / g. The molding pressure in the brick making process is 20MPa, the steam curing temperature after molding is 60°C, and the curing time is 24h.

[0017] Performance tests are performed on finished bricks that have been shaped and cured. It was measured on the third day after it was made, and the compressive strength was 29MPa, the flexural strength was 6.6MPa, and the volume expansion rate was 0.025%. Measured on the 28th day after it was made, the compressive strength was 30MPa, the flexural strength was 6.9MPa, the volume expansion rate was 0.025...

Embodiment 2

[0019] Take 24.75kg of finely ground steel slag, 40.25kg of cement, 13.63kg of natural zeolite, 18.87kg of sand, 2.5kg of sodium tartrate, and 8kg of water, and mix them as raw materials for brick making. Among them, the average particle size of finely ground steel slag is 0.06mm, and the specific surface area is 350m 2 / g, the f-CaO content is 1.8%; the average particle size of natural zeolite is 2.0mm, and the specific surface area is 415m 2 / g. The molding pressure in the brick making process is 22MPa, the steam curing temperature after molding is 65°C, and the curing time is 36h.

[0020] Performance tests are performed on finished bricks that have been shaped and cured. It was measured on the third day after it was made, and the compressive strength was 32MPa, the flexural strength was 6.5MPa, and the volume expansion rate was 0.043%. Measured on the 28th day after it was made, the compressive strength was 35MPa, the flexural strength was 6.9MPa, the volume expansion r...

Embodiment 3

[0022] Take 34.5kg of finely ground steel slag, 35.5kg of cement, 13.4kg of natural zeolite, 14.6kg of sand, 2kg of sodium tartrate, and 9kg of water, and mix them as raw materials for brick making. Among them, the average particle size of finely ground steel slag is 0.08mm, and the specific surface area is 400m 2 / g, the f-CaO content is 1.6%; the average particle size of natural zeolite is 1.0mm, and the specific surface area is 475m 2 / g. The molding pressure in the brick making process is 23MPa, the steam curing temperature after molding is 70°C, and the curing time is 48h.

[0023] Performance tests are performed on finished bricks that have been shaped and cured. It was measured on the third day after it was made, and the compressive strength was 32MPa, the flexural strength was 6.1MPa, and the volume expansion rate was 0.030%. Measured on the 28th day after it was made, the compressive strength was 36MPa, the flexural strength was 7.0MPa, the volume expansion rate wa...

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Abstract

The invention belongs to the field of brick making, and relates to a water permeable brick prepared by using natural zeolite and steel slags as raw materials. Raw materials comprise a binding material, an aggregate, a modifying agent and water, and the water is used as a dispersing agent. The binding material is fine-ground steel slags and cement, the aggregate is natural zeolite and grit, and themodifying agent is one or more of sodium tartrate, sodium malate and sodium citrate. In the brick making process, the shaping pressure is 18-25MPa, after the brick is shaped, steam curing needs to beperformed, the curing temperature is 45-75 DEG C, and the curing time is 12-72h. The steel slags are used for preparing the water permeable brick, and through combination of a physical method and a chemical method, before preparation and during preparation, the steel slags are modified, and the volume invariability of the finished product namely the brick is improved.

Description

technical field [0001] The invention belongs to the field of brick making, in particular to a permeable brick prepared from natural zeolite and steel slag. Background technique [0002] Permeable brick is a basic pavement and building material, which has a wide range of application scenarios and a large amount of use. The permeable process of general permeable bricks has no adsorption or filtering effect, and the pollutants dispersed or dissolved on the surface can penetrate from one side to the other side. When used as a pavement material, the pollutants on the pavement can easily enter the ground through permeable bricks, causing groundwater pollution. Modulating the properties of permeable bricks to achieve the retention of pollutants in the permeable process can block the diffusion of pollutants and prevent secondary pollution, which has significant environmental protection value. [0003] Natural zeolite is a widely distributed inorganic mineral resource, which has th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B18/14C04B14/04C04B38/08
CPCC04B14/047C04B18/142C04B28/00C04B2111/00284C04B2201/50C04B14/06C04B24/06C04B38/08Y02W30/91
Inventor 吉可明刘平张侃
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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