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Method for preparing concrete brick

A technology for concrete bricks and paving bricks, which is applied in the fields of concrete materials, concrete bricks and their preparation, and can solve problems such as the limitation of recycled aggregates or waste glass aggregates, and achieve the effects of saving mining, protecting the environment, and reducing emissions

Active Publication Date: 2013-05-08
THE HONG KONG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a concrete brick using recycled aggregate and / or waste glass aggregate and its preparation for the limitation of the application of recycled aggregate or waste glass aggregate in existing concrete bricks method

Method used

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  • Method for preparing concrete brick

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Produce concrete paving bricks according to the ratio in Table 1. Methods for determining compressive strength are well known in the art. The carbon dioxide absorption rate of the brick is calculated by the following formula:

[0051] Brick CO 2 Absorption rate (%) = (weight increase of brick after curing / dry weight of brick) × 100%

[0052] From the ratio listed in Table 1 and the characteristics of the produced concrete paving bricks, it can be seen that due to the increase in the amount of waste glass aggregate, the strength of the paving bricks has decreased, but the strength of all concrete paving bricks still reaches above 49MPa. carbon dioxide (CO 2 ) gas curing increases the strength of the brick by at least 20%. In addition, the strength of all paving blocks fully meets the requirements of Hong Kong building codes and Chinese national standards. When waste glass aggregates are added, the impact of bricks on CO 2 The reduction in the absorption rate is m...

Embodiment 2

[0057] Proportionally produce concrete partition wall bricks according to Table 2. and determine the compressive strength and CO 2 absorption rate.

[0058] Table 2. Proportion and performance test results of concrete partition wall bricks

[0059]

[0060]

[0061] It can be seen from the proportions listed in Table 2 and the characteristics of the produced concrete partition wall bricks that due to the increase in the amount of waste glass aggregates, the strength of the partition wall bricks has decreased, and carbon dioxide (CO 2 ) gas curing increases the strength of the brick by at least 20%. The strength of all concrete partition wall bricks still meets the requirements of Hong Kong building codes and Chinese national standards. Compared with paving bricks, the CO2 absorption rate of partition bricks is increased.

Embodiment 3

[0063] Produce concrete paving bricks according to the ratio in Table 3. and determine the compressive strength and CO 2 absorption rate.

[0064] From the listed proportion of table 3 and the characteristics of the manufactured concrete paving bricks, it can be seen that compared with example 1, the curing time of carbon dioxide increases, and the CO 2 The absorption rate increases, but when the carbon dioxide curing time exceeds 6 hours, the increase in the absorption rate slows down.

[0065] Table 3. Proportion and performance test results of concrete paving bricks

[0066]

[0067] In addition, the paving bricks manufactured by the mixing ratios listed in Examples 1 to 3 were subjected to an alkali-aggregate reaction experiment according to the American standard (ASTMC1260-01), and the paving bricks mixed with fly ash or kaolin powder or slag powder were mixed for 14 days The expansion ratios are all less than 0.02%, far less than the standard requirement of 0.1%. ...

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Abstract

The present invention relates to a method for preparing concrete bricks. The concrete bricks are produced by using cement, aggregate, and fly ash or slag powder, kaolin powder or slag powder, blending through a blender and then pressing by a molding machine. The bricks are then fed into a carbon dioxide curing room for maintenance or are maintained at ambient pressure and room temperature or atmospheric pressure steam. The used aggregate includes recycled aggregates and cullet aggregates, and also may include sand or pebbles. The concrete bricks provided by the present inventions can be made into paving bricks, partition wall bricks and load bearing wall bricks due to different proportions. The performance of the concrete bricks fully meets the standard requirements. The concrete bricks have a good function of absorbing carbon dioxide.

Description

technical field [0001] The invention relates to concrete materials in the field of building materials, in particular to a concrete brick and a preparation method thereof. Background technique [0002] Human society produces a large amount of construction waste and waste glass bottles every day, and dealing with these construction waste and waste glass bottles has become a serious social and environmental problem. With the rapid economic growth and the improvement of people's living standards, in large and medium-sized cities in China, the management and treatment of construction waste and waste glass bottles is also becoming a major environmental problem, and seriously affects the country's sustainable development strategy . Therefore, it is becoming increasingly important to develop new technologies for recycling and utilizing construction waste and waste glass. [0003] Construction waste generally consists of concrete fragments, bricks and tiles, sand, dust, wood, plast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B28/04C04B28/08C04B18/30
CPCY02W30/91
Inventor 潘智生寇世聪
Owner THE HONG KONG POLYTECHNIC UNIV
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