Recycled sintered brick aggregate C30-containing concrete and preparation method thereof

A technology for concrete and sintered bricks, which is applied in the field of C30 concrete containing recycled sintered brick aggregates and its preparation, and can solve problems affecting the fluidity and strength of concrete mixtures, low strength and ductility of recycled concrete specimens, and resource utilization of construction waste Low efficiency and other issues, to achieve the effect of improving microstructure and durability, increasing the number of effective collisions, and improving stirring efficiency

Inactive Publication Date: 2018-11-20
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are mainly the following problems in the preparation technology and engineering application of construction waste resource utilization in recycled concrete at home and abroad: First, the process of crushing construction waste into recycled aggregate will cause cracks in the recycled aggregate, and The structural surface of recycled aggregate may be carbonized and eroded by rainwater in nature, which will cause the recycled aggregate to become loose, which will lead to defects such as low strength and ductility, large creep shrinkage and other defects in the recycled concrete specimen. Generally, the recycled concrete prepared The strength is 10-20MPa; second, due to the need for strength and other working performance, the ratio of recycled aggregates used in recycled concrete to replace natural aggregates is low, resulting in low efficiency of resource utilization of construction waste; third, due to the use of recycled sintered bricks The aggregate density is low, and the traditional concrete mixing technology is prone to the floating of recycled aggregates, resulting in uneven aggregates inside the concrete, which negatively affects the fluidity and strength of the concrete mixture

Method used

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  • Recycled sintered brick aggregate C30-containing concrete and preparation method thereof
  • Recycled sintered brick aggregate C30-containing concrete and preparation method thereof
  • Recycled sintered brick aggregate C30-containing concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Testing of working performance of C30 concrete containing recycled sintered brick aggregate:

[0023] A C30 concrete containing recycled fired brick aggregate, composed of the following raw materials by weight: cement 494.22kg, recycled fired brick coarse aggregate 765.99kg, natural coarse aggregate 327.85kg, fine aggregate 589.98kg, water 250.97kg, water ash The ratio is 0.51.

[0024] The cement is P.O 42.5R ordinary Portland cement.

[0025] The particle size of the coarse aggregate of recycled fired bricks d 1 5mm-10mm, volume density is 1032kg / m 3 , the crushing index is 15.2%, the water absorption rate is 12%, and the water content rate is 5.26%.

[0026] In the regenerated sintered brick coarse aggregate, the regenerated sintered brick aggregate accounts for 45%-65% of the total mass of the regenerated aggregate.

[0027] The natural coarse aggregate includes limestone gravel, and the particle size d of the natural coarse aggregate is 2 5mm-16mm, ...

Embodiment 2

[0036] Embodiment 2: Containing recycled sintered brick aggregate C30 concrete compressive strength test:

[0037] Put the cube test block of compressive strength in the C30 concrete containing recycled sintered brick aggregate obtained in the embodiment of the present invention, let it stand for 24 hours in an environment with a temperature of 20 ± 5°C, and finally move it to the concrete standard curing room for curing. The age of standard curing for 28d. After reaching the curing age, according to the provisions of GB / T50081-2002 "Standards for Test Methods of Mechanical Properties of Ordinary Concrete", the test blocks were taken out for compression tests. The test results are shown in Table 1. It can be seen from the test results that the prepared C30 concrete containing recycled fired brick aggregate meets the standard requirements of concrete.

[0038] Table 1 Strength test results of concrete containing recycled fired brick aggregate

[0039]

Embodiment 3

[0040] Example 3: Testing of working performance of C30 concrete containing recycled sintered brick aggregate:

[0041] A C30 concrete containing recycled fired brick aggregate, composed of the following raw materials by weight: cement 635.37kg, recycled fired brick coarse aggregate 730.95kg, natural coarse aggregate 310.05kg, fine aggregate 570.95kg, water 292.26kg, water ash The ratio is 0.46.

[0042] The cement is P.O 42.5R ordinary Portland cement.

[0043] The particle size of the coarse aggregate of recycled fired bricks d 1 5mm-10mm, volume density is 1140kg / m 3 , the crushing index is 17.3%, the water absorption rate is 14.8%, and the water content rate is 6.52%.

[0044]In the regenerated sintered brick coarse aggregate, the regenerated sintered brick aggregate accounts for 45%-65% of the total mass of the regenerated aggregate.

[0045] The natural coarse aggregate includes limestone gravel, and the particle size d of the natural coarse aggregate is 2 5mm-16mm,...

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Abstract

The invention discloses recycled sintered brick aggregate C30-containing concrete and a preparation method thereof. The recycled sintered brick aggregate C30-containing concrete is prepared from cement, recycled sintered brick aggregates, natural coarse aggregates, fine aggregates and water according to a mass ratio of 1:(1.21-1.54):(0.48-0.66):(0.86-1.19):(0.39-0.50), and a water-ash ratio is 0.40-0.51. The preparation technology enhances the intensity of recycled concrete and obviously improves the working properties, such as workability, flowability and cohesiveness, of the concrete; furthermore, the preparation method is simple, efficient, environmentally friendly and energy-saving.

Description

technical field [0001] The invention relates to the technical field of building engineering materials, in particular to a concrete containing recycled fired brick aggregate C30 and a preparation method thereof. Background technique [0002] With the continuous advancement of the urbanization process, the acceleration of the industrialization process and the continuous improvement of people's living standards, the construction waste generated in various cities in my country is increasing day by day, accounting for 30%-40% of the total urban waste. The output of construction waste is about 600 million tons. The utilization of renewable resources of construction waste is an important aspect to enable the construction industry to achieve sustainable development, build a circular economy and build a conservation-minded society. In the past 100 years, a large number of masonry structures have been built in my country, resulting in waste bricks accounting for more than 30% of const...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B18/167C04B14/28C04B14/06
Inventor 高畅黄靓
Owner HUNAN UNIV
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