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Waste sintered brick recycled C30 concrete and preparation method thereof

A technology for waste sintered bricks and concrete, applied in the field of construction engineering materials, can solve the problems affecting the resource utilization of waste sintered bricks, low strength grade of recycled concrete, and low aggregate density of waste sintered bricks, etc. The effect of improving performance and saving natural resources

Active Publication Date: 2015-04-22
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are mainly the following problems in the preparation technology of recycled concrete from the construction waste generated by the demolition of old buildings and structures at home and abroad: First, the aggregate density of waste fired bricks is low, and aggregates are prone to float during the vibration process , so that the aggregate distribution inside the concrete is uneven, resulting in a relatively low strength grade of recycled concrete, generally C10-C20; second, according to the strength requirements, recycled aggregate can only partially replace natural aggregate for the preparation of recycled concrete , and the substitution rate is low
Therefore, in order to increase the compressive strength of concrete, the replacement rate of recycled aggregate can only be reduced, which affects the resource utilization of waste fired bricks

Method used

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  • Waste sintered brick recycled C30 concrete and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A recycled C30 concrete from waste fired bricks, which is prepared from cement, recycled coarse aggregate from waste fired bricks, fine aggregate, water and water reducer at a mass ratio of 1:1.679:0.653:0.397:0.006.

[0027] The cement is P.O 42.5 ordinary Portland cement.

[0028] The bulk density of the waste sintered brick regenerated coarse aggregate is 1611 kg / m 3 , the crushing index is 31.8%, the water absorption rate is 30%, and the particle size is d 1 Mass distribution: 5 mm≤d 1 ≤10mm is 22%, 10mm1 ≤16mm is 30%, 16mm1 ≤20 mm is 26%, 20 mm1 ≤25mm is 22%.

[0029] The fine aggregate is river sand with an apparent density of 2527 kg / m 3 , moisture content 5%, particle size d 2 Range: 0.15 mm~2.36 mm, particle size distribution: 0.15 mm≤d 2 ≤0.3 mm is 9%, 0.3 mm2 ≤0.6 mm is 30%, 0.6 mm2 ≤1.18mm is 36%, 1.18mm2 ≤2.36mm is 25%.

[0030] The water reducer is a polycarboxylate high-efficiency water reducer.

[0031] According to GB / T50080-2002 "General Concret...

Embodiment 2

[0033] A recycled C30 concrete from waste sintered bricks, which is prepared from cement, recycled coarse aggregate from waste sintered bricks, fine aggregate, water and water reducer at a mass ratio of 1:1.695:0.693:0.389:0.007.

[0034] The cement is P.O 42.5 ordinary Portland cement.

[0035] The bulk density of the waste sintered brick regenerated coarse aggregate is 1632 kg / m 3 , the crushing index is 30.1%, the water absorption rate is 26%, and the particle size is d 1 Mass distribution: 5 mm≤d 1 ≤10mm is 25%, 10mm1 ≤16mm is 28%, 16mm1 ≤20 mm is 25%, 20 mm1 ≤25mm is 22%.

[0036]The fine aggregate is machine-made sand with an apparent density of 2570 kg / m 3 , moisture content 4%, particle size d 2 The range is: 0.15 mm to 2.36 mm, and the particle size and mass distribution is: 0.15 mm≤d 2 ≤0.3 mm is 10%, 0.3 mm2 ≤0.6 mm is 26%, 0.6 mm2 ≤1.18mm is 40%, 1.18mm2 ≤2.36 mm is 24%.

[0037] The water reducer is a polycarboxylate high-efficiency water reducer.

[0038] ...

Embodiment 3

[0040] A recycled C30 concrete from waste fired bricks, which is prepared from cement, recycled coarse aggregate from waste fired bricks, fine aggregate, water and water reducer at a mass ratio of 1:1.708:0.732:0.382:0.008.

[0041] The cement is P.O 42.5 ordinary Portland cement.

[0042] The bulk density of the waste sintered brick regenerated coarse aggregate is 1651 kg / m 3 , the crushing index is 29.3%, the water absorption rate is 23%, and the particle size distribution is: 5 mm≤d 1 ≤10mm is 22%, 10mm1 ≤16mm is 27%, 16mm1 ≤20 mm is 28%, 20 mm1 ≤25mm is 23%.

[0043] The fine aggregate is river sand with an apparent density of 2605 kg / m 3 , moisture content 3%, particle size range: 0.15 mm to 2.36 mm, particle size mass distribution: 0.15 mm≤d 2 ≤0.3 mm is 10%, 0.3 mm2 ≤0.6 mm is 28%, 0.6 mm2 ≤1.18 mm is 39%, 1.18 mm2 ≤2.36 mm is 23%.

[0044] The water reducer is a polycarboxylate high-efficiency water reducer.

[0045] According to GB / T50080-2002 "General Concrete M...

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Abstract

The invention relates to waste sintered brick recycled C30 concrete and a preparation method thereof. The waste sintered brick recycled C30 concrete is prepared from cement, a waste sintered brick recycled coarse aggregate, a fine aggregate, water and a water reducing agent at a weight ratio of 1 to (1.679-1.737) to (0.653-0.817) to (0.367-0.397) to (0.006-0.01). The C30 concrete prepared by the method disclosed by the invention is qualified and stable in strength, high in compressive strength and split and tensile strength, good in working performances such as workability, fluidity and water retention property, simple and environmentally friendly in preparation process and easy to implement.

Description

technical field [0001] The invention relates to the technical field of building engineering materials, in particular to a recycled C30 concrete using waste fired bricks and a preparation method thereof. Background technique [0002] With the continuous acceleration of my country's urbanization process, the continuous deepening of new rural construction, the transformation of old villages, and the construction of new villages, a large number of urban and rural houses have been demolished. After investigation and research, it has been found that most of the old buildings in urban and rural areas in my country are made of sintered clay. Masonry structures or mixed structures with bricks as the main material, therefore, lead to an unprecedented increase in construction waste mainly composed of fired clay bricks. At present, the total amount of construction waste piled up in my country has reached 70×10 9 t, the construction solid waste generated by the annual demolition of build...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/16
CPCY02W30/91
Inventor 高丹盈景嘉骅左祥祥周潇
Owner ZHENGZHOU UNIV
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