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Low-drying shrinkage high-performance recycled concrete

A recycled concrete, high-performance technology, applied in the field of civil engineering concrete, can solve the problems of small elastic modulus, reduced inhibition, and large drying shrinkage of recycled aggregates, so as to reduce the drying shrinkage value, solve a large number of stacking, and improve volume stability sexual effect

Inactive Publication Date: 2015-05-06
FUJIAN JIANGXIA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shrinkage mechanism of recycled concrete is basically the same as that of ordinary concrete, but because the old cement mortar on the surface of the recycled aggregate shrinks after absorbing water, and the elastic modulus of the recycled aggregate is small, the inhibition effect is reduced, resulting in the recycled concrete under normal circumstances. Drying shrinkage is greater than that of ordinary concrete

Method used

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  • Low-drying shrinkage high-performance recycled concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A high-performance recycled concrete with low drying shrinkage, which contains 400kg of cementitious materials (including 280kg of cement and 120kg of fly ash), 345kg of natural coarse aggregate, 805kg of recycled coarse aggregate, 660kg of natural fine aggregate, and 160kg of water. High-efficiency water reducer 9.0kg. The obtained high-performance recycled concrete had a slump of 195 mm and a 28-day cubic compressive strength of 40.2 MPa. The drying shrinkage of the obtained high-performance recycled concrete 2RAC70-F30 (Y2) and the ordinary concrete NC1 with the same proportion were tested respectively, and the results are shown in Table 2.

Embodiment 2

[0033]A high-performance recycled concrete with low drying shrinkage, which contains 500kg of cementitious material (300kg of cement, 200kg of fly ash), 950kg of recycled coarse aggregate, 715kg of natural fine aggregate, 180kg of water, and 5.0kg of superplasticizer. The obtained high-performance recycled concrete has a slump of 190 mm and a 28-day cubic compressive strength of 52.1 MPa. The drying shrinkage performance of the obtained high-performance recycled concrete 2RAC100-F40 (Y2) and the ordinary concrete NC2 with the same proportion were tested respectively, and the results are shown in Table 2.

Embodiment 3

[0035] A high-performance recycled concrete with low drying shrinkage, which contains 450kg of cementitious materials (270kg, 180kg of fly ash), 307kg of natural coarse aggregate, 714kg of recycled coarse aggregate, 476kg of natural fine aggregate, recycled fine aggregate 204kg, water 180kg, superplasticizer 4.0kg. The obtained high-performance recycled concrete has a slump of 210mm and a 28-day cubic compressive strength of 51.5Mpa. The drying shrinkage performance of the obtained high-performance recycled concrete 2RAC70-F40-RF30 (Y2) and the ordinary concrete NC3 with the same proportion were tested, and the results are shown in Table 2.

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Abstract

The invention discloses low-drying shrinkage high-performance recycled concrete satisfying pumping requirements, and belongs to the technical field of civil engineering concrete. Every cubic meter of the high-performance recycled concrete comprises 400-500 kg of binding material, 950-1150 kg of coarse aggregate, 660-715 kg of fine aggregate, 160-180 kg of water and 4-9 kg 0f superplasticizer, wherein the coarse aggregate is a recycled coarse aggregate or a mixture of the recycled coarse aggregate and natural coarse aggregate; the fine aggregate is a natural fine aggregate or a mixture of the natural fine aggregate and a recycled fine aggregate and prepared by a process of stone enveloped with cement. The strength grade of the obtained high-performance recycled concrete is C30-C50 and the slump is 180-210 mm; the dry shrinkage of the recycled concrete can be effectively improved to ensure that the dry shrinkage value is reduced by more than 25% relative to the common recycled concrete and lower than the common concrete with same proportion. The low-drying shrinkage high-performance recycled concrete has a significant theoretical value and social meaning for the reasonable and wide application of recycled concrete and the resource recovery of construction waste.

Description

technical field [0001] The invention belongs to the technical field of civil engineering concrete, and in particular relates to a high-performance recycled concrete with low drying shrinkage. Background technique [0002] Concrete is currently the most used building material. The amount of concrete used in the world exceeds 1 billion cubic meters per year, of which the amount of sand and gravel aggregate required reaches 6-8 billion tons. The demand for a large amount of sand and gravel has led to a large number of mountain quarrying and river sand excavation, which has seriously damaged the ecological environment and restricted the sustainable development of society. On the other hand, construction waste is the main component of urban waste, among which waste concrete accounts for the highest proportion, about 30% to 50%. In order to solve the above two problems, the recycling of waste concrete has become an important issue. [0003] High-performance recycled concrete is ...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B14/02C04B14/06
Inventor 陈欣郑建岚罗素蓉王雪芳王国杰
Owner FUJIAN JIANGXIA UNIV
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