Preparation method of recycled aggregate concrete

A recycled aggregate and concrete technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of poor mechanical properties and durability, and achieve the goal of improving compressive strength and interfacial bond strength Effect

Inactive Publication Date: 2012-12-19
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the shortcomings of poor mechanical properties and durability of recycled aggregate concrete prepared by traditional molding technology, the present invention provides a kind of microstructure that can improve the interface transition zone of recycled concrete, so as to achieve the preparation of recycled aggregate concrete that improves the performance of recycled concrete method

Method used

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  • Preparation method of recycled aggregate concrete
  • Preparation method of recycled aggregate concrete
  • Preparation method of recycled aggregate concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 1100 kg of regenerated aggregate, 70 kg of slag and 1.87 kg of polycarboxylate superplasticizer to the forced concrete and stir for 15 seconds, then add 15% (27 kg) of water and stir for 15 seconds, and then add 300 kg of Cement and 600kg of natural sand were mixed for 30s, and finally the remaining 85% (151kg) of water was added and stirred for 60s to form freshly mixed recycled aggregate concrete.

Embodiment 2

[0030] Add 900kg of regenerated aggregate, 80kg of slag and 2.31kg of polycarboxylate water-reducer to the forced concrete mixer and stir for 15s, then add 25% (46kg) water and stir for 15s, then add 300kg The cement and 600kg of natural sand were mixed for 30s, and finally the remaining 75% (136kg) of water was added and stirred for 60s to prepare freshly mixed recycled aggregate concrete.

Embodiment 3

[0032] Add 1200kg of regenerated coarse aggregate, 40kg of slag, 35kg of silica fume and 2.86kg of lignosulfonate sodium salt superplasticizer to the forced concrete mixer and stir for 15s, then add 18% (32kg) Then add 300kg of cement and 600 kg of natural sand and stir for 30s, and finally add the remaining 82% (148kg) of water and stir for 60s to prepare fresh recycled aggregate concrete.

[0033] The following table shows the 7d and 28d compressive strength results of the recycled aggregate concrete prepared in Examples 1, 2, and 3 of the present invention, and the recycled aggregate concrete prepared by the traditional primary mixing molding process and secondary mixing molding process. Wherein the raw materials and proportions adopted in the traditional primary and secondary stirring molding processes are consistent with those adopted in Example 3.

[0034] One-time mixing process Secondary mixing process Example 1 Example 2 Example 3 7d compress...

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Abstract

The invention relates to a preparation method of recycle aggregate concrete, belongs to the field of preparation methods of cement concrete, aims at solving the problems of poor mechanical performance and poor durability of recycled aggregate concrete prepared by a traditional molding process, and provides the preparation method of the recycled aggregate concrete capable of improving the microstructure of a recycled concrete interface transition region to improve the performance of the recycled concrete. The preparation method comprises the following steps of: absorbing and airing the recycled aggregate until the surface of the recycled aggregate is dried, and uniformly mixing and stirring with admixture and water reducing agent; uniformly stirring with the first part of water, and uniformly stirring with cement and natural aggregate; and uniformly stirring the second part of water. The recycled aggregate concrete prepared by the method can be used for effectively reducing the interface transition region and improving the microstructure of the interface transition region, so that the interface transition region around the recycled aggregate is compact; and the interface bonding strength between the recycled aggregate and cement in the concrete can be greatly improved.

Description

technical field [0001] The invention relates to a preparation method of cement concrete, in particular to a preparation method of recycled aggregate concrete. Background technique [0002] At present, the use of recycled aggregates to prepare concrete has made great progress, and its molding process has an important impact on the preparation and performance of recycled concrete. The concept of recycled aggregate concrete is: After crushing, cleaning and grading waste concrete blocks, mix them with grading in a certain proportion to form recycled aggregate, and partially or completely replace natural aggregates such as sand and gravel to prepare fresh concrete. This technology effectively solves the problems of environmental pollution and resource waste caused by the stacking of construction concrete waste, and meets the strategic requirements of sustainable development. [0003] Compared with natural aggregate, recycled aggregate has a rough particle surface with more edges...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/16
CPCY02W30/91
Inventor 王守德赵智慧宫晨琛芦令超程新
Owner UNIV OF JINAN
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