Recycled aggregate concrete and preparation method thereof

A technology of recycled aggregate and concrete, which is applied in the field of building materials, can solve the problem of less recycled aggregate concrete, achieve the effects of improving aging resistance and hydrolysis resistance, wide sources, and enhancing microscopic stress-strain performance

Inactive Publication Date: 2015-12-23
FUJIAN JIANGXIA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the research results show that if the admixtures such as active ultrafine mineral powder and high-efficiency water reducer can be added, the recycled aggregate can be modified through a certain technical approach, and high-performance green concrete with high strength and good durability can be made. , so that it is widely used in loa

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Preparation of modified wood fiber:

[0037] 1) Add the dry wood powder to the high-speed mixer, stir at 80°C, and add the aluminate coupling agent of 2% of the weight of the wood powder in two times, the time interval between the two additions is 3 minutes, and then stir for 5 minutes after adding , to obtain activated wood flour;

[0038] 2) Add 200 parts by weight of activated wood powder to an aqueous solution containing 60 parts by weight of A-151 silane coupling agent, stir for 0.4 hours, heat to 60°C, stir for 8 hours and filter, and place the obtained wood powder in In an industrial centrifuge, take it out after centrifuging at 500r / min for 15min;

[0039]3) Vacuum dry the treated wood powder at 50°C for 24 hours, then cool it down to 20°C, then put the wood powder and 100 parts by weight of maleic anhydride graft copolymer into a high-speed mixer, and rotate and mix at 300r / min for 2 hours After that, heat to 100°C, mix at 400r / min for 15min, cool to 45°...

Embodiment 2

[0058] 1. Preparation of modified wood fiber:

[0059] 1) Add the dry wood powder to the high-speed mixer, stir at 85°C, and add the aluminate coupling agent of 2% of the weight of the wood powder in two times, the time interval between the two additions is 3 minutes, and then stir for 6 minutes after adding , to obtain activated wood flour;

[0060] 2) Add 200 parts by weight of activated wood powder to an aqueous solution containing 70 parts by weight of A-171 silane coupling agent, stir for 0.4 hours, heat to 61°C, stir for another 6 hours and filter, and place the obtained wood powder in In an industrial centrifuge, take it out after centrifuging at 500r / min for 15min;

[0061] 3) Vacuum dry the treated wood powder at 52°C for 24 hours, then cool to 26°C, then put the wood powder and 120 parts by weight of maleic anhydride graft copolymer into a high-speed mixer, and mix at 300r / min for 1.5 After h, heat to 90°C, mix at 420r / min for 13min, cool to 45°C, and discharge t...

Embodiment 3

[0080] 1. Preparation of modified wood fiber:

[0081] 1) Add the dry wood powder to the high-speed mixer, stir at 90°C, and add the aluminate coupling agent of 2% of the weight of the wood powder in two times, the time interval between the two additions is 4 minutes, and then stir for 6 minutes after adding , to obtain activated wood flour;

[0082] 2) Add 200 parts by weight of activated wood powder into an aqueous solution containing 80 parts by weight of A-151 silane coupling agent, stir for 0.4 hours, heat to 62°C, stir for 5 hours and filter, and place the obtained wood powder in In an industrial centrifuge, take it out after centrifuging at 500r / min for 15min;

[0083] 3) Vacuum-dry the treated wood powder at 55°C for 24 hours, then cool to 28°C, then put the wood powder and 150 parts by weight of maleic anhydride graft copolymer into a high-speed mixer, and rotate and mix at 300r / min for 1h Afterwards, heat to 80°C, mix at 450r / min for 10 minutes, cool to 45°C, and...

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PUM

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Abstract

The invention discloses recycled aggregate concrete and a preparation method thereof. The recycled aggregate concrete comprises the following raw materials by weight percent: 15 to 20 percent of cement, 5 to 15 percent of water, 15 to 25 percent of third mixed additive, 38 to 63 percent of coarse aggregate, 0.3 to 1 percent of modified wood fiber-containing polyurethane modified epoxy resin flexibilizing emulsion, 0.1 to 0.5 percent of lauryl sodium sulfate, 0.1 to 0.5 percent of sodium gluconate, 0.1 to 0.5 percent of water glass, 0.5 to 1 percent of polyacrylate, and the sum of weight percent of the raw materials is 100 percent; and the coarse aggregate is the waste concrete renewable coarse aggregate or a mixture of waste concrete renewable coarse aggregate and natural coarse aggregate. The renewable aggregate concrete has good impact resistance, earthquake resistance and crack resistance, the pressure resisting strength of the recycled aggregate concrete in 28 days can reach 80 to 100 MPa, and the recycled aggregate concrete is applicable to a load-bearing structure.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a recycled aggregate concrete and a preparation method thereof. Background technique [0002] The relationship between the quality of recycled concrete and the performance of original concrete and mortar, the damage of original concrete, the method of breaking and the composition of the new mixture have been studied at home and abroad. The quality of the recycled concrete and the quality of the interface zone, as well as the mortar content in the matrix concrete play an important role in determining the performance of recycled concrete. The strength characteristics of recycled concrete are affected by some key factors such as the strength of the matrix concrete, the ratio of coarse and fine aggregates in the matrix concrete, the ratio of the maximum particle size of the aggregate in the matrix concrete to the maximum particle size of the recycled concrete aggregate, ...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B18/16
CPCY02W30/91
Inventor 蒋国平肖三霞
Owner FUJIAN JIANGXIA UNIV
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