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Preparation method of early-strength water reducer for first-aid repair work

An early-strength water-reducing agent and engineering technology, applied in the field of retarding water-reducing agents, can solve the problems of slow development of concrete strength, limited use, and failure to consider the influence of concrete thixotropy

Inactive Publication Date: 2018-09-11
芜湖恒固混凝土材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the traditional polycarboxylate-based water reducer will delay the hydration of cement, the early strength of concrete will develop slowly, which limits its use in precast concrete and cold climates.
Patent application number 201310346345.8 discloses a high early strength polycarboxylate water reducer and its preparation method. The water reducer is made of methallyl polyoxyethylene ether, acrylamide, sodium methacrylate, Acrylic acid and acrylated alkanolamine and other monomers are polymerized under the action of initiators and chain transfer agents. This water reducer has problems such as single early strength mode, limited shortening of setting time, and no consideration of the impact on concrete thixotropy.

Method used

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  • Preparation method of early-strength water reducer for first-aid repair work

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preparation example Construction

[0017] The present invention also provides a preparation method of the early-strength water reducer for emergency repair projects, the steps are as follows:

[0018] (1) Mixing sepiolite fiber, hexamethylolmelamine hexamethyl ether and pentaerythritol oleate in an aqueous medium at 120-150° C. for 0.5-1 hour to obtain modified sepiolite fiber;

[0019] (2) Polyethylene glycol monomethyl ether acrylate, mono(meth)acrylate monomer, methacrylic acid and unsaturated acid are mixed uniformly in the mixed solution of water and glycerin, then add chain transfer agent, at 70- Stir at 110°C for 1.5-5h to obtain a polyester polycarboxylate water reducer;

[0020] (3) Add asbestos wool and modified sepiolite fiber to the polyester polycarboxylate water reducer, mix thoroughly, then add alkyl organic amine, sodium nitrite, defoamer, mix evenly, and then use Early-strength water reducer for emergency repair projects.

[0021] The invention adopts polyethylene glycol monomethyl ether acry...

Embodiment 1

[0023] (1) Mix 2 g of sepiolite fiber, 1.5 g of hexamethylolmelamine hexamethyl ether and 1 g of pentaerythritol oleate in water for 1 hour at 125° C., centrifugally wash and dry to obtain modified sepiolite fiber;

[0024] (2) 35g polyethylene glycol monomethyl ether acrylate, 8g polyethylene glycol polytetramethylene glycol mono(meth)acrylate and 1.5g maleic acid are mixed uniformly in the mixed solution of 100g water and 25g glycerin, Then add 0.5g of mercaptoacetic acid and stir at 80°C for 2.5h to obtain a polyester polycarboxylate water reducer;

[0025] (3) Add 5g of asbestos wool and modified sepiolite fiber to the polyester polycarboxylate water reducer, mix well, then add 6g of triisopropanolamine, 15g of sodium nitrite, and 0.5g of silicone defoaming agent Agent (Defeng defoamer, DF-1089), mixed evenly, that is, an early-strength water reducer for emergency repair projects.

Embodiment 2

[0027] (1) Mix 1g of sepiolite fiber, 1g of hexamethylolmelamine hexamethyl ether and 2g of pentaerythritol oleate in an aqueous medium at 150°C for 0.5h, centrifuge, wash and dry to obtain modified sepiolite fiber;

[0028] (2) 40g polyethylene glycol monomethyl ether acrylate, 6g propoxy polyethylene glycol polypropylene glycol mono(meth)acrylate and 1g maleic acid are mixed homogeneously in the mixed solution of water and 30g glycerol, then Add 0.2g of mercaptoethanol and stir at 110°C for 1.5h to obtain a polyester polycarboxylate water reducer;

[0029] (3) Add 6g of asbestos wool and modified sepiolite fiber to the polyester polycarboxylate water reducer, mix well, then add 10g of triethanolamine, 12g of sodium nitrite, and 1g of polyether modified silicon defoamer (Defeng defoamer, DF-881), mix evenly, and get the early-strength superplasticizer for emergency repair projects.

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Abstract

The invention relates to the technical field of early-strength water reducers, specifically to a concrete early-strength water reducer for first-aid repair work. A preparation method of the early-strength water reducer for first-aid repair work comprises the following steps: (1) uniformly mixing polyethylene glycol monomethyl ether methyl acrylate, mono(methyl)acrylate monomer and unsaturated acidin a mixed solution of water and glycerin, adding a chain transferring agent, and stirring at 70-110 DEG C for 1.5-5 h so as to obtain a polyester polycarboxylic acid water-reducer; and (2) adding asbestos wool and modified sepiolite fiber into the polyester polycarboxylic acid water-reducer, fully mixing, adding alkyl organic amine, sodium nitrite and an antifoaming agent, and uniformly mixing to obtain the early-strength water reducer for first-aid repair work. According to the early-strength water reducer of the invention, gas content of concrete is greatly reduced and initial setting timeand final setting time of concrete are shortened, and durability is enhanced.

Description

technical field [0001] The invention relates to the technical field of retarding water-reducing agents, in particular to a preparation method of an early-strength water-reducing agent used in emergency repair projects. Background technique [0002] Water reducing agent is an admixture that can reduce water consumption under the condition that the concrete slump is basically the same. In order to shorten the construction period, adding enhanced water reducer to concrete can not only improve the performance of concrete but also increase the early strength of concrete. Water reducers are divided into two types: organic and inorganic. Organic water reducers are in the category of water surface active agents. They have a better water reducing effect and can well reduce the interfacial energy between water, gas and solid, and play a role in lubrication and dispersion. However, it is weak to change the hydration reaction process of cement concrete; the inorganic water reducing age...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42
CPCC04B40/0046C04B24/2694C04B14/40C04B14/4643C04B24/121C04B22/085C04B24/42
Inventor 承忠富
Owner 芜湖恒固混凝土材料有限公司
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