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Modified material and treatment method of low-quality aggregate

A technology for modifying materials and processing methods, which is applied in the field of building materials, and can solve the problems of not being able to achieve effective pore filling and surface coating at the same time, so as to promote secondary hydration/chemical bonding, ensure strength and compactness, and optimize The effect of the interface

Inactive Publication Date: 2020-11-24
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Therefore, the technical problem to be solved by the present invention is to overcome the defects that the modified materials and modification methods for porous and low-quality aggregates in the prior art cannot simultaneously achieve effective filling of pores and surface coating, thereby providing a low-cost Modified material and treatment method of high-quality aggregate

Method used

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  • Modified material and treatment method of low-quality aggregate
  • Modified material and treatment method of low-quality aggregate
  • Modified material and treatment method of low-quality aggregate

Examples

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Effect test

Embodiment 1

[0067] The present embodiment provides a kind of processing method of low-quality aggregate, comprising the following steps:

[0068] The composition of the modified material:

[0069] Portland cement 52.5R 50kg; mineral admixture 12.5kg; active powder 5kg; water reducing agent 0.6kg; 3kg metakaolin, 4kg limestone, 2.5kg silica fume; the active powder is nano-silica; the water reducer is ZY-700 polycarboxylate water reducer produced by CNBM Zhongyan Technology Co., Ltd.; the viscosity regulator is BASF Rheoplus420 high-performance viscosity modifier produced by China Co., Ltd.

[0070] The processing steps are as follows: 1) Soak 20 kg of the cleaned coral aggregate with 50 kg of water glass solution with a mass fraction of 30% for 4 hours, take it out, and dry it for use; Stir evenly before use; 3) put the coral aggregate to be treated into the impregnation container, inject the modified material, vacuumize, stir for 1 min under a vacuum of 5 kPa, and then stir for 2 min un...

Embodiment 2

[0072] The present embodiment provides a kind of processing method of low-quality aggregate, comprising the following steps:

[0073] The composition of the modified material:

[0074] Portland cement 52.5R 50kg; mineral admixture 15kg; active powder 2kg; water reducing agent 0.2kg; Metakaolin, 4kg limestone; the active powder is nano-silica; the water reducer is ZY-700 polycarboxylate water reducer produced by CNBM Zhongyan Technology Co., Ltd.; the viscosity regulator is Ningbo Zhongshuike Chemical Technology Co., Ltd. The SK-420 viscosity modifier produced by the company.

[0075] The processing steps are as follows: 1) Soak 35 kg of the cleaned coral aggregate with 50 kg of water glass solution with a mass fraction of 5% for 5 hours, take it out, and dry it for use; Stir evenly and set aside; 3) Put the coral aggregate to be treated into an impregnation container, inject the modified material slurry, and then stir for 6 minutes under a high pressure of 0.5 MPa; 4) Dip th...

Embodiment 3

[0077] The present embodiment provides a kind of processing method of low-quality aggregate, comprising the following steps:

[0078] The composition of the modified material:

[0079] Aluminate cement CA-60 46kg; mineral admixture 13kg; active powder 4kg; water reducing agent 0.5kg; 100kg, of which, the composition of the mineral admixture is 5kg fly ash, 4kg metakaolin, 4kg silica fume; the active powder is nano-silica; the water reducer is ZY-700 produced by CNBM Zhongyan Technology Co., Ltd. Polycarboxylate water reducer; viscosity regulator is the Rheoplus420 high-performance viscosity modifier produced by BASF China Co., Ltd.; the expansion agent is the ZY-UEAII type expansion agent produced by CNBM Zhongyan Technology Co., Ltd.; The agent is the SX rosin air-entraining agent produced by Shanxi Sanmus Building Material Chemical Co., Ltd.; the defoamer is a silicone defoamer.

[0080] The processing steps are as follows: 1) Soak 25 kg of the cleaned coral aggregate with...

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Abstract

The invention belongs to the technical field of building materials, and specifically relates to a modified material and treatment method of a low-quality aggregate. The modified material of the low-quality aggregate provided by the invention comprises the following components in percentage by mass: 46-50% of cement, 10-15% of a mineral admixture, 2-5% of an active powder, 0.2-0.6% of a water reducing agent, 0.001-0.004% of a viscosity adjusting agent, 0-3.2% of an expanding agent, 0-0.12% of an air entraining agent, and 0-0.0007% of a defoaming agent. The modified material provided by the invention can realize effective filling and coating modification of the low-quality aggregate through the cooperation between the components, and the adjustment of the use amount, and especially through the cooperation of the specific use amount of the cement, active powder and viscosity adjusting agent, the surface tension and viscosity of the modified material can be effectively adjusted, and a porepenetration amount and a shell coating thickness are coordinately optimized. The combined use of the inorganic and organic components promotes the secondary hydration / chemical bonding of a slurry layer, and improves the strength of an interface between the aggregate and the slurry layer. The cylindrical compress strength of the aggregate after modification treatment is increased by 40% or more, acrushing value is reduced by 30% or more, and a water absorption rate in 24 h is reduced by 15% or more.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a modified material of low-quality aggregate and a processing method. Background technique [0002] With the continuous advancement of my country's ocean development strategy, the amount of infrastructure construction in offshore islands or coastal areas has increased significantly. As an important part of concrete raw materials, ordinary river sand and gravel resources are extremely scarce on offshore islands and are transported from the mainland. Sand and gravel raw materials will greatly increase the construction cost and prolong the construction period. Under the premise of not destroying the local ecological environment, using abandoned coral reefs and sand on islands and reefs as raw materials to prepare coral aggregate concrete can not only save natural sand and gravel resources, reduce transportation costs, shorten the construction period, but also e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B28/04C04B20/10
CPCC04B28/06C04B28/04C04B20/1074C04B7/02C04B18/08C04B18/12C04B18/146C04B14/106C04B14/28C04B22/06C04B24/24C04B2103/302C04B2103/0068C04B22/148C04B22/066C04B2103/304C04B2103/50
Inventor 曹银王玲王振地姚燕
Owner CHINA BUILDING MATERIALS ACAD
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