Recycled c25 concrete from waste fired bricks and its preparation method

A technology for waste sintered bricks and concrete, which is applied in the field of construction engineering materials, can solve the problems affecting the resource utilization of waste sintered bricks, the low strength level of recycled concrete, and the reduction of the replacement rate of recycled aggregates, so as to improve basic mechanical properties and mechanical properties. The effect of improving and saving natural resources

Active Publication Date: 2016-11-30
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 the prepared recycled concrete, generally C10-C20; second, according to the strength requirements, recycled aggregates can only partially replace natural aggregates for recycled concrete Preparation, and the substitution rate is generally low
Therefore, in order to increase the compressive strength of concrete, the replacement rate of recycled aggregate can only be reduced, which in turn affects the resource utilization of waste fired bricks

Method used

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  • Recycled c25 concrete from waste fired bricks and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A recycled C25 concrete from waste fired bricks is prepared from cement, recycled coarse aggregate from waste fired bricks, fine aggregate, and water at a mass ratio of 1:1.96:1.15:0.46.

[0029] Described cement is P.O 42.5 ordinary Portland cement.

[0030] The bulk density of the waste sintered brick regenerated coarse aggregate is 1609 kg / m 3 , the crushing index is 31.6%, the water absorption rate is 29%, and the particle size is d 1 Mass distribution: 5 mm≤d 1 ≤10mm is 25%, 10mm1 ≤16mm is 30%, 16mm1 ≤20 mm is 25%, 20 mm1 ≤25mm is 20%.

[0031] The fine aggregate is river sand with an apparent density of 2536 kg / m 3 , moisture content 3%, particle size d 2 Range: 0.15 mm~2.36 mm, particle size distribution: 0.15 mm≤d 2 ≤0.3 mm is 10%, 0.3 mm2 ≤0.6 mm is 30%, 0.6 mm2 ≤1.18mm is 30%, 1.18mm2 ≤2.36mm is 30%.

[0032] According to GB / T50080-2002 "General Concrete Mixture Performance Test Method Standard" to test the working performance of the waste fired brick ag...

Embodiment 2

[0034] A recycled C25 concrete from waste fired bricks is prepared from cement, recycled coarse aggregate from waste fired bricks, fine aggregate, and water at a mass ratio of 1:1.91:1.17:0.45.

[0035] Described cement is P.O 42.5 ordinary Portland cement.

[0036] The bulk density of the waste sintered brick regenerated coarse aggregate is 1623 kg / m 3 , the crushing index is 30.7%, the water absorption rate is 27%, and the particle size is d 1 Mass distribution: 5 mm≤d 1 ≤10mm is 25%, 10mm1 ≤16mm is 35%, 16mm1 ≤20 mm is 20%, 20 mm1 ≤25mm is 20%.

[0037] The fine aggregate is machine-made sand with an apparent density of 2591kg / m 3 , moisture content 3.3%, particle size d 2The 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 20%, 0.3 mm2 ≤0.6 mm is 20%, 0.6 mm2 ≤1.18mm is 30%, 1.18mm2 ≤2.36mm is 30%.

[0038] According to GB / T50080-2002 "General Concrete Mixture Performance Test Method Standard" to test the working pe...

Embodiment 3

[0040] A recycled C25 concrete from waste fired bricks is prepared from cement, recycled coarse aggregate from waste fired bricks, fine aggregate, and water at a mass ratio of 1:1.85:1.19:0.44.

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

[0042] The bulk density of the waste sintered brick regenerated coarse aggregate is 1645kg / m 3 , the crushing index is 29%, the water absorption rate is 27%, and the particle size is d 1 Mass distribution: 5 mm≤d 1 ≤10mm is 20%, 10mm1 ≤16mm is 40%, 16mm1 ≤20 mm is 20%, 20 mm1 ≤25mm is 20%.

[0043] The fine aggregate is river sand with an apparent density of 2611 kg / m 3 , moisture content 3.9%, 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 20%, 0.3 mm2 ≤0.6 mm is 25%, 0.6 mm2 ≤1.18mm is 25%, 1.18mm2 ≤2.36mm is 30%.

[0044] According to GB / T50080-2002 "General Concrete Mixture Performance Test Method Standard", the working performance of th...

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Abstract

The invention relates to waste sintered brick recycled C25 concrete and a preparation method thereof. The C25 concrete is prepared from cement, waste sintered brick recycled coarse aggregate, fine aggregate and water at a mass ratio of 1: (1.76-1.96): (1.15-1.23): (0.42-0.46). The prepared concrete has qualified and stable strength as well as good working performance such as workability, fluidity, water-retaining property and the like, the preparation process is simple and environment-friendly, and construction is easier.

Description

technical field [0001] The invention relates to the technical field of building engineering materials, in particular to recycled C25 concrete from 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 and the successive rollout of old village reconstruction, 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 my country's urban and rural areas are mainly made of fired clay bricks. Masonry or hybrid structures of materials. Therefore, resulting in an unprecedented increase in construction waste mainly based on 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 buildings in 2×10 9 More than t, the va...

Claims

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Application Information

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Patent Type & Authority Patents(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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