Preparation method for water-preserving and salt-tolerant alkaline concrete internal curing agent
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A technology of concrete internal and curing agent, which is applied in the field of concrete admixture to achieve good construction performance
Active Publication Date: 2012-02-22
GUILIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
Therefore, more important for SAP is its ability to absorb alkaline water and release water, but there are few reports in the existing literature.
Method used
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Embodiment 1
[0022] (1) Weigh 2.5g of tapioca starch, 1g of kaolin, 0.02g of ammonium cerium nitrate, 0.18g of ammonium persulfate and 0.012g of N,N'-methylenebisacrylamide into a beaker, dissolve in 100ml of distilled water, and use glass Stir the rod until fully dissolved to obtain a mixed solution; put the mixed solution into a four-neck flask and place it in a water bath at 80°C and stir thoroughly;
[0023] (2) Weigh 7.5g of acrylamide and 2.5g of 2-acrylamido-2-methylpropanesulfonic acid into a beaker, add 100ml of deionized water, and stir evenly to obtain a monomer solution;
[0024] (3) At 80°C, add the monomer solution prepared in step (2) dropwise into a four-necked flask, and control the monomer solution addition time at 0.5 hours; carry out the mixed solution prepared in step (1) Graft copolymerization reaction with the monomer solution, the reaction time is 4 hours, and the gel-like graft copolymer is obtained after the reaction;
[0025] (4) The graft copolymer prepared in ...
Embodiment 2
[0028] (1) Weigh 2.5g of tapioca starch, 1g of bentonite, 0.015g of cerium ammonium nitrate, 0.135g of potassium persulfate and 0.012g of N, N'-methylenebisacrylamide into a beaker, dissolve in 100ml of distilled water, and use a glass rod Stir until fully dissolved to obtain a mixed solution; put the mixed solution into a four-necked flask, place it in a 70°C water bath and stir thoroughly;
[0029] (2) Weigh 6g of acrylamide and 4g of sodium methacrylate into a beaker, add 100ml of deionized water, and stir until fully dissolved to obtain a monomer solution;
[0030] (3) At 70°C, add the monomer solution prepared in step (2) dropwise into a four-necked flask, and control the time for adding the monomer solution to 0.5 hours; carry out the mixed solution prepared in step (1) Graft copolymerization reaction with the monomer solution, the reaction time is 4 hours, and the gel-like graft copolymer is obtained after the reaction;
[0031] (4) The graft copolymer prepared in step...
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Abstract
The present invention discloses a preparation method for a water-preserving and salt-tolerant alkaline concrete internal curing agent. According to the method, plant starch, inorganic powder with a layered structure, an anionic monomer, a non-ionic monomer and water are adopted as main raw materials; under effects of an initiator, a cross-linking agent and a certain temperature, treatments of dissolving, reacting, filtering, washing, drying and crushing are performed to obtain the internal curing agent. The internal curing agent of the present invention has the following advantages that: the internal curing agent of the present invention provides the stronger deionized water absorbency than the existing internal curing agent, wherein the deionized water absorbency is increased by 200-500 times; the saline solution absorbency and the alkaline solution absorbency are 35-55% of the deionized water absorbency; the water-preserving rate of the internal curing agent of the present invention is 55-65% after the internal curing agent absorbs the alkaline solution; with adopting the low mixing amount of 0.05-0.5% of the internal curing agent, the strength of the silica fume-doped C60-C100 high-performance concretes is not reduced while the 7-day autogenous shrinkage rates of the concretes are reduced by 65-85%; the internal curing agent of the present invention is applicable for the high strength and early strength concrete pavement, steel pipe concrete under the closed environment, self-compacting concrete and other engineering fields, wherein the fields adopt the design with a low water-cement ratio and a high cementing material content, and adopt a large amount of high activity mineral admixtures.
Description
technical field [0001] The invention relates to a preparation method of an internal curing agent for water-retaining, salt-resistant and alkali-resistant concrete, which belongs to the technical field of concrete admixtures. technical background [0002] High-performance concrete (HPC for short) has the characteristics of high workability, high volume stability, high durability and long-term maintenance of superior mechanical properties, and is widely used in roads, bridges and high-rise buildings. In the early stage of hydration (from initial setting to 7 days), HPC is prone to internal self-drying effect due to internal water shortage, forming self-shrinkage. Excessive autogenous shrinkage, on the one hand, leads to a large number of micro-cracks in the internally constrained concrete, and on the other hand, it leads to penetrating cracking in the externally constrained concrete. Due to the high density of HPC, traditional external maintenance methods such as film coverin...
Claims
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