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Application of water reducer great in water reduction performance and resistant to mud in recycled aggregate concrete of architecture solid waste

A recycled aggregate and concrete technology, applied in solid waste management, sustainable waste treatment, climate sustainability, etc., can solve the problems of concrete slump loss, concrete loss of fluidity and slump, loss of workability, etc.

Active Publication Date: 2018-09-21
SHANGHAI CONSTR BUILDING MATERIALS TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the high mud content and complex composition of the recycled aggregate, the aggregate mud content is high, and a large amount of admixture is adsorbed on the surface of the soil particles, and the research shows that the PEO side chain of the polycarboxylate superplasticizer is connected with the soil particles. Intercalation reaction, the result of the joint action of the two is that the concrete slump loses quickly, so that the concrete completely loses its fluidity and slump, and loses workability. High water reducing agent with good performance

Method used

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  • Application of water reducer great in water reduction performance and resistant to mud in recycled aggregate concrete of architecture solid waste
  • Application of water reducer great in water reduction performance and resistant to mud in recycled aggregate concrete of architecture solid waste
  • Application of water reducer great in water reduction performance and resistant to mud in recycled aggregate concrete of architecture solid waste

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Embodiment 1

[0057] An embodiment of the preparation method of the high water-reducing and mud-resistant water-reducing agent of the present invention comprises the following steps:

[0058] (1) Water, 3-buten-1-amine, H 3 PO 3 Add concentrated hydrochloric acid with a mass concentration of 37% into a 500ml four-neck glass flask with a stirrer, a thermometer, and a reflux condenser, fully stir and mix, heat up to 40°C, and slowly add formaldehyde solution with a mass concentration of 37%. The dropping time is controlled at 2 hours, and then the temperature is slowly raised to 75°C, and the reaction is continued for 2.5 hours to obtain the reaction monomer B;

[0059] (2) Water, APEG-CH 2 CH 2 NH 2 、H 3 PO 3 Add concentrated hydrochloric acid with a mass concentration of 37% into a 500ml four-necked glass flask equipped with a stirrer, a thermometer, and a reflux condenser, fully stir and mix, heat up to 40°C, slowly add a 37% formaldehyde aqueous solution dropwise, and drop The addi...

Embodiment 2

[0068] An embodiment of the preparation method of the high water-reducing and mud-resistant water-reducing agent of the present invention comprises the following steps:

[0069] (1) Water, 3-buten-1-amine, H 3 PO 3 Add concentrated hydrochloric acid with a mass concentration of 37% into a 500ml four-necked glass flask with a stirrer, a thermometer, and a reflux condenser, fully stir and mix, heat up to 45°C, and slowly add formaldehyde solution with a mass concentration of 37%. The dropping time is controlled at 1.5h, then the temperature is slowly raised to 85°C, and the reaction is continued for 1.5h to obtain the reaction monomer B;

[0070] (2) Water, HPEG-CH 2 CH 2 NH 2 、H 3 PO 3 Add concentrated hydrochloric acid with a mass concentration of 37% into a 500ml four-necked glass flask equipped with a stirrer, a thermometer, and a reflux condenser, fully stir and mix, heat up to 45°C, and slowly add formaldehyde solution with a mass concentration of 37%. The addition ...

Embodiment 3

[0079] An embodiment of the preparation method of the mud-resistant water reducer of the present invention comprises the following steps:

[0080] (1) Water, 3-buten-1-amine, H 3 PO 3 Add concentrated hydrochloric acid with a mass concentration of 37% into a 500ml four-necked glass flask equipped with a stirrer, a thermometer, and a reflux condenser, fully stir and mix, heat up to 42°C, and slowly add formaldehyde solution with a mass concentration of 37%. The dropping time is controlled at 2 hours, and then the temperature is slowly raised to 80°C, and the reaction is continued for 2 hours to obtain the reaction monomer B;

[0081] (2) Water, TPEG-CH 2 CH 2 NH 2 、H 3 PO 3 Add concentrated hydrochloric acid with a mass concentration of 37% into a 500ml four-necked glass flask equipped with a stirrer, a thermometer, and a reflux condenser, fully stir and mix, heat up to 43°C, slowly add a 37% formaldehyde aqueous solution dropwise, drop The addition time is controlled at...

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Abstract

The invention discloses application of a water reducer great in water reduction performance and resistant to mud in recycled aggregate concrete of architecture solid waste. The invention also providesthe recycled aggregate concrete of the architecture solid waste, wherein the recycled aggregate concrete contains the water reducer great in water reduction performance and resistant to mud. The water reducer great in water reduction performance and resistant to mud is based on a macromolecular structural design principle and formed by polymerizing activated monomers containing phosphorous acid functional groups and sulphonic acid functional groups, the macromolecular structure is in a ball shape and contains a great number of amidogen radicals containing positive charge, and therefore the water reducer has superior properties such as great water reduction performance, excellent slump loss resistance and high clay tolerability. The water reducer is used alone or cooperates with other functional polycarboxylate water reducers for use and has excellent water reduction performance and great slump loss resistance for the recycled aggregate concrete of the architecture solid waste.

Description

technical field [0001] The invention relates to the application of a water-reducing agent in recycled concrete, in particular to the application of a high water-reducing and mud-resistant water-reducing agent in building solid waste recycled aggregate concrete. Background technique [0002] Concrete is the second most consuming material on earth after water. The annual consumption in the world exceeds 20 billion tons. While the consumption of concrete is huge, it also causes social and environmental problems of resource consumption and waste disposal. my country is the country with the largest number of newly built buildings in the world, and it is also the country with the largest number of old buildings demolished every year in the world. According to preliminary estimates, the demolition of buildings per square meter will generate about 1 ton of construction solid waste. The rapid development of cities will inevitably produce a large amount of construction solid waste, an...

Claims

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Application Information

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IPC IPC(8): C04B24/16C04B28/00C04B103/30
CPCC04B24/165C04B28/00C04B2103/302C04B18/08C04B14/02C04B14/068C04B18/04C04B24/246C04B28/02Y02W30/91C04B18/16
Inventor 张小富吴德龙冯波赵利华
Owner SHANGHAI CONSTR BUILDING MATERIALS TECH GRP CO LTD
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