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Recycled aggregate structural concrete and manufacture method

A technology of recycled aggregate and manufacturing method, applied in the field of concrete, can solve the problems of high water absorption, decreased durability, limited application of recycled aggregate, etc.

Inactive Publication Date: 2013-05-08
SHENZHEN HUAWEI ENVIRONMENTAL PROTECTION BUILDINGMATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Compared with natural stone aggregate, recycled aggregate has the following disadvantages: high water absorption, low crushing index, high void ratio
Therefore, when the recycled aggregate is used to make concrete, it will bring the weaknesses of concrete slump, low strength, decreased elastic modulus, high drying shrinkage and creep, and decreased durability, which will lead to the degradation of recycled aggregate. Very limited use in structural concrete

Method used

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  • Recycled aggregate structural concrete and manufacture method
  • Recycled aggregate structural concrete and manufacture method
  • Recycled aggregate structural concrete and manufacture method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] According to Table 1, the recycled aggregates with a particle size of 20 mm and 10 mm (water absorption before treatment are 6.23% and 7.76%, respectively, and the specific gravity is 2393 kg / m3 and 2356 kg / m3) using different concentrations The physical properties and mechanical properties of the recycled aggregate were measured according to the standard method after the water-soluble resin (PVA) was poured naturally and vacuumized and dried.

[0018] From the data listed in Table 1, it can be seen that with the increase of resin concentration, the specific gravity and crushing index of the recycled aggregate treated by the two filling methods increased, and the water absorption decreased. When the resin concentration exceeds 10%, the performance of the aggregate does not change much. At the same time, it can be seen that although the natural pouring method doubles the time, the effect of improving the performance of the recycled aggregate is not as good as that of the...

Embodiment 2

[0022] Table 2 lists the proportions of concrete manufactured with recycled aggregates treated with 10% PVA, while Table 3 lists the mechanical properties and durability of concrete produced according to the proportions of Table 2. It can be seen that the mechanical properties and durability of the recycled aggregate concrete without treatment are poor. Also, the performance of concrete decreases with the increase of recycled aggregate.

[0023] Compared with the concrete made of untreated recycled aggregate, the 28-day compressive strength, splitting strength and elastic modulus of the concrete treated with PVA are greatly improved, the 112-day dry shrinkage rate is reduced, and the 365-day creep is reduced. . 50% recycled aggregate replaces natural aggregate, and its performance fully meets the requirements of structural concrete.

[0024] Table 2 Properties of concrete with different recycled aggregate content

[0025]

[0026] *R1-50, R1-100 refers to the recycled ag...

Embodiment 3

[0030] Table 4 lists the proportions of recycled aggregates treated with 10% PVA at different cement contents, different water-cement ratios, and different mineral additive contents, while Table 5 shows the concrete manufactured according to the proportions in Table 4 performance. It can be seen from Table 5 that the mechanical properties and durability of recycled aggregate concrete can be greatly improved by increasing the cement content, reducing the water-cement ratio, and adding mineral additives such as kaolin powder or silica fume, while adding fly ash will reduce Concrete 28-day strength, but durability of concrete can be improved.

[0031] Table 4 Proportion of recycled aggregate concrete with different cement contents and different water-cement ratios

[0032]

[0033] Table 5 Performance of recycled aggregate concrete with different cement contents and different water-cement ratios

[0034]

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Abstract

The invention first provides a concept of improving the physical performance and mechanical performance of a recycled aggregate by utilizing water-soluble resin, and the concrete is applicable to a structural concrete and a high-performance recycled aggregate concrete. The invention also provides a manufacture method of the recycled aggregate structural concrete, wherein the cement can be any of the cements which are commonly used in the concrete technology; and the admixture includes the water-soluble resin such as polyving akohol (PVA) and white emulsion. The manufacture method of the concrete comprises the following steps in sequence: mixing the water-soluble resin with the water based on a certain ratio; pouring the mixture into the recycled aggregate through a dipping or a vacuuming way; drying the aggregate by air so as to reduce the water absorption of the recycled aggregate as well as improving the crush index; uniformly stirring the cement, the processed recycled aggregate, the sand or gravel or the fine recycled aggregate and other mineral substances based on a certain mixing ratio; and conveying or pumping the mixture to a construction site to pour, so as to obtain the recycled aggregate structural concrete provided by the invention.

Description

technical field [0001] The invention belongs to the concrete category in the field of building materials, and relates to a structural concrete manufactured by using a water-soluble resin to improve the physical properties and mechanical properties of recycled aggregate and using the recycled aggregate, and a manufacturing method of the structural concrete. Background technique [0002] With the rapid development of the economy, in many large cities in China, the waste generated by the construction industry has become a public hazard. These wastes not only cause serious damage to the environment, but also compete with human beings for living space, seriously affecting the sustainable development of the country. Therefore, it is imminent to develop new technologies to reduce, recycle and utilize construction waste. [0003] Construction waste is mainly produced during the demolition of old buildings and the construction of new buildings. Therefore, to reduce buildings, it is ...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B28/06C04B18/16
CPCY02W30/91
Inventor 寇世聪杨正松张昭雄潘志奇
Owner SHENZHEN HUAWEI ENVIRONMENTAL PROTECTION BUILDINGMATERIAL
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