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Slow-release plastic expanding agent for cement-based binding material and preparation method of slow-release plastic expanding agent

A technology of plastic expansion agent and cementitious material, applied in the chemical field of cement-based cementitious material, can solve the problems of inability to compensate for chemical shrinkage, self-shrinkage and other shrinkage problems, unfavorable development of concrete strength and durability, uneven gas generation, etc. Achieve the effect of maintaining volume stability, improving the ability to resist segregation and bleeding, and improving flow properties

Active Publication Date: 2016-01-27
武汉市恒星防水材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Within 1 to 3 hours of the plastic stage of cement-based cementitious materials, common expansion agents on the market are used. Even the composite high-expansion calcium aluminate-calcium sulfoaluminate-calcium oxide expansion agent cannot compensate for the chemical damage caused by the plastic stage of cement paste. Shrinkage, self-shrinkage and other shrinkage problems; and the traditional metal powder expansion agent has a fast reaction speed, a large gas volume, large pores, and uneven gas generation, causing tiny cracks to form inside, which is not conducive to the development of concrete strength and durability.

Method used

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  • Slow-release plastic expanding agent for cement-based binding material and preparation method of slow-release plastic expanding agent
  • Slow-release plastic expanding agent for cement-based binding material and preparation method of slow-release plastic expanding agent
  • Slow-release plastic expanding agent for cement-based binding material and preparation method of slow-release plastic expanding agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1) 10 parts of calcium stearate and 5 parts of diethylene glycol, 5 parts of isobutyl methacrylate and 2 parts of silicone oil are mixed uniformly with the solid and liquid components in parts by mass;

[0048] 2) Add 45 parts of azodicarbonamide, 33 parts of N,N'-dinitrosopentamethylenetetramine and the pre-mixed foaming aid and foam stabilizer in step 1) to a small ball mill of solid components;

[0049] 3) Add the liquid mixing component of step 1) in the grinding process of step 2), and after the two components are ground evenly, control the particle size to be less than 80 μm, that is, to obtain the plastic expansion of slow-release cement-based cementitious material agent.

[0050]The plastic expansion agent for slow-release cement-based cementitious materials prepared in this example is mixed into C40 concrete at 0.2‰ of the cementitious materials in ordinary concrete. The early plastic shrinkage rate of the concrete is 0%, the 28d free expansion rate reaches 0...

Embodiment 2

[0052] 1) Prepare 10 parts of zinc stearate and 10 parts of borax in mass parts, and mix the solid components and liquid components in 6 parts of silicone oil evenly;

[0053] 2) Add 34 parts of azodicarbonamide, 40 parts of N,N'-dinitrosopentamethylenetetramine and the pre-mixed foaming aid and foam stabilizer in step 1) to a small ball mill of solid components;

[0054] 3) Add the liquid mixing component of step 1) in the grinding process of step 2), and after the two components are ground evenly, control the particle size to be less than 80 μm, that is, to obtain the plastic expansion of slow-release cement-based cementitious material agent.

[0055] The plastic expansion agent for slow-release cement-based cementitious materials prepared in this example is mixed into C30 concrete at 0.1‰ of the cementitious materials in ordinary concrete. The early plastic shrinkage rate of the concrete is 0.01%, the 28d free expansion rate reaches 0.05%, and the 28-day compressive stren...

Embodiment 3

[0057] 1) the mass parts are 10 parts of zinc stearate and 5 parts of glycerin, the solid component and the liquid component in 5 parts of isobutyl methacrylate and 2 parts of silicone oil are mixed uniformly respectively;

[0058] 2) Add 40 parts of azodicarbonamide, 35 parts of N,N'-dinitrosopentamethylenetetramine and the pre-mixed foaming aid and foam stabilizer in step 1) to a small ball mill of solid components;

[0059] 3) Add the liquid mixing component of step 1) in the grinding process of step 2), and after the two components are ground evenly, control the particle size to be less than 80 μm, that is, to obtain the plastic expansion of slow-release cement-based cementitious material agent.

[0060] The plastic expansion agent for slow-release cement-based cementitious materials prepared in this example is mixed into the C80 pipe pile concrete at 0.1‰ of the cementitious materials in ordinary concrete. The early plastic shrinkage rate of the concrete is 0%, the 28d ...

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Abstract

The invention provides a slow-release plastic expanding agent for a cement-based binding material and a preparation method of the slow-release plastic expanding agent and particularly relates to a plastic expanding agent capable of continuously generating certain expansion to compensate for early shrinkage of the cement-based binding material before the stage that a cement-based binding material mixture loses plasticity. The slow-release plastic expanding agent for the cement-based binding material is prepared from, by weight, 30-50 parts of aliphatic azo compounds, 20-40 parts of N-nitro compounds, 5-20 parts of foaming promoter and 5-15 parts of foam stabilizer. When the slow-release plastic expanding agent, polycarboxylate water reducing agent, a naphthalene water reducing agent and an aliphatic water reducing agent are compounded for use, the viscosity of the cement-based binding material mixture is slightly increased, the workability of the mixture is improved, micro-expansion is generated, and early shrinkage of the cement-based binding material mixture can be offset to a certain degree.

Description

technical field [0001] The invention relates to the chemical technology field of cement-based cementitious materials, in particular to a slow release type cement-based cementitious material that can continuously generate a certain expansion before the cement-based cementitious material mixture loses its plasticity stage to compensate for the early shrinkage of the cement-based cementitious material A plastic expansion agent and a preparation method thereof. Background technique [0002] The TB / T3192-2008 "Technical Conditions for Post-tensioned Prestressed Concrete Beam Pipeline Grouting of Railways" promulgated by the Ministry of Railways in 2008 clearly prohibits the use of high-alkaline expansion agents or expansion agents with aluminum powder as the expansion source, which limits The use of calcium oxide expansion agent and aluminum powder in press grout. The expansion effect of aluminate, sulfoaluminate and magnesium oxide expansion agents commonly used at present is r...

Claims

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Application Information

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IPC IPC(8): C04B24/42C04B24/12C04B24/04
Inventor 柯凯江波贺行洋苏英常鹰孙艺恒代飞
Owner 武汉市恒星防水材料有限公司
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