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Additive used for increasing flexural and compressive strength of cement mortar, and preparation and application method thereof

A technology of compressive strength and cement mortar, applied in the field of cement admixture and its preparation, can solve the problems of poor reinforcement effect of polymer cement admixture and the like

Active Publication Date: 2017-05-31
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the technical problem that the existing polymer cement admixture has poor reinforcing effect, and provides an admixture for improving the flexural and compressive strength of cement mortar and its preparation and use method

Method used

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  • Additive used for increasing flexural and compressive strength of cement mortar, and preparation and application method thereof
  • Additive used for increasing flexural and compressive strength of cement mortar, and preparation and application method thereof
  • Additive used for increasing flexural and compressive strength of cement mortar, and preparation and application method thereof

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specific Embodiment approach 1

[0024] Specific embodiment one: the admixture that improves the flexural and compressive strength of cement mortar material of the present embodiment is CMC-XYX type polymer emulsion, wherein CMC is carboxymethyl cellulose in the polymer, X is styrene sulfonic acid group , Y is a vinyl acetate group.

specific Embodiment approach 2

[0025] Specific embodiment two: the preparation method of the admixture that improves cement mortar material bending resistance and compressive strength described in specific embodiment one, carries out according to the following steps:

[0026] 1. Take sodium carboxymethyl cellulose, sodium styrene sulfonate, vinyl acetate, potassium persulfate and water; wherein the mass ratio of sodium carboxymethyl cellulose to potassium persulfate is 1: (0.18~0.833); The mass ratio of sodium carboxymethyl cellulose to sodium styrene sulfonate is 1: (1-10.5); the ratio of the mass of sodium carboxymethyl cellulose to the volume of vinyl acetate is 1 g: (2.15-11.25) mL; The ratio of the mass of sodium carboxymethyl cellulose to the volume of water is 1g: (22-28) mL; then divide the sodium styrene sulfonate into two equal parts, and divide the potassium persulfate into three equal parts;

[0027] 2. Add water into the reaction vessel with a reflux condenser and a stirrer, heat it in a water ...

specific Embodiment approach 3

[0035] Specific embodiment 3: The difference between this embodiment and specific embodiment 2 is that the dropping rate in step 6 is (0.004-0.007) mL / s, which is equivalent to adding 1 drop every 3-5 s. Others are the same as in the second embodiment.

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Abstract

The invention discloses an additive used for increasing flexural and compressive strength of cement mortar, and a preparation and application method thereof, and belongs to the field of cement additive. The additive is used for solving a technical problem of conventional polymer cement additives that strengthening effect is poor. The additive is a CMC-XYX type polymer emulsion, wherein CMC is used for representing carboxymethyl cellulose, X is used for representing styrene sulfonic acid group, and Y is used for representing acetic acid vinyl ester group. The preparation method comprises following steps: potassium persulphate and sodium p-styrene sulfonate are added into a carboxymethyl cellulose solution successively for graft copolymerization; potassium persulphate, and acetic acid vinyl ester are added successively for graft copolymerization; and potassium persulphate and sodium p-styrenesulfonate are added successively for graft copolymerization so as to obtain the additive. In applications, the additive is uniformly mixed with sodium lignosulfonate, water, sand, and cement, and then is uniformly mixed with tributyl phosphate. The preparation and application method is simple; and the additive can be used in building field.

Description

technical field [0001] The invention relates to a cement admixture and a preparation method thereof. Background technique [0002] Cement mortar composite materials are widely used in the modern construction industry and play an irreplaceable role. However, complex and diverse construction methods and use environments put forward higher requirements for the mechanical properties of cement mortar. Therefore, improving the mechanical properties of cement mortar is the key inevitable trend of development. [0003] Ordinary cement mortar has disadvantages such as high water consumption and high folding ratio, which affect its wide-scale application. Polymers are usually used as admixtures to increase the flexural strength of cement mortar and reduce water consumption. The modification of cement mortar by polymer is mainly due to the film formation of polymer and the formation of micro-bubbles to increase the fluidity of cement mortar. However, there are many problems in the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/02C08F212/14C08F218/08C04B24/16C04B28/04
CPCC04B24/163C04B28/04C04B2201/52C08F251/02C04B24/168C04B24/18C04B24/003C08F214/14C08F218/08
Inventor 韩福芹吕高磊孙开萌
Owner NORTHEAST FORESTRY UNIVERSITY
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