High-performance cement mortar and preparation method thereof

A high-performance technology for cement mortar, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of low tension-compression strength ratio, low bond strength, large dry shrinkage deformation, etc., and achieve early High strength, low cost, and improved flexibility

Inactive Publication Date: 2017-04-19
DONGGUAN LIANZHOU INTPROP OPERATION MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Cement mortar is a heterogeneous brittle material with a porous structure. During the hardening process, it has high brittleness, low tensile and compressive strength ratio, large dry shrinkage deformation, low elongation, poor crack resistance, low bond strength, impermeability, and corrosion resistance. Poor performance and other defects, so that the scope of application is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A high-performance cement mortar, in parts by weight, comprises the following components:

[0040] 26 parts of cement, 50 parts of river sand,

[0041] 2 parts of organic admixture, 1 part of modified coconut fiber,

[0042] 1 part antifreeze, 1 part fatty acid monoglyceride,

[0043] 0.8 parts of sodium tetraborate, 1 part of calcium chloride, 10 parts of water;

[0044] Its preparation method comprises the following steps:

[0045] (1) Preparation of organic admixture:

[0046] Put the solution of acrylic acid and isopentyl polyoxyethylene ether copolymer with a molecular weight of 80,000 and a mass concentration of 5% into a three-necked flask with a constant temperature in a water bath at 25°C, and adjust its pH to 11 with a 1mol / L sodium hydroxide solution. First dropwise add a calcium nitrate solution with a mass concentration of 40%, after the dropwise addition is completed, continue to stir for 10 hours, and then add dropwise a sodium silicate solution with ...

Embodiment 2

[0053] A high-performance cement mortar, in parts by weight, comprises the following components:

[0054] 40 parts of cement, 60 parts of river sand,

[0055] 5 parts of organic admixture, 3 parts of modified coconut fiber,

[0056] Antifreeze 4 parts, fatty acid monoglyceride 2 parts,

[0057] 1.5 parts of sodium tetraborate, 2 parts of calcium chloride, 30 parts of water;

[0058] Its preparation method comprises the following steps:

[0059] (1) Preparation of organic admixture:

[0060] Put the solution of trimethylaminopropyl methacrylamide and propyl polyoxyethylene ether copolymer with a molecular weight of 30,000 and a mass concentration of 15% in a three-necked flask with a constant temperature in a water bath at 50°C, and use 1mol / L hydrogen Sodium oxide solution to adjust the pH of the copolymer solution to 12, first dropwise add a sodium silicate solution with a mass concentration of 15%, stir while adding, continue stirring for 5 hours after the addition is co...

Embodiment 3

[0068] A high-performance cement mortar, in parts by weight, comprises the following components:

[0069] 30 parts of cement, 53 parts of river sand,

[0070] 3 parts of organic admixture, 1.5 parts of modified coconut fiber,

[0071] Antifreeze 2 parts, fatty acid monoglyceride 1.4 parts,

[0072] 1 part of sodium tetraborate, 1 part of calcium chloride, 15 parts of water;

[0073] Its preparation method comprises the following steps:

[0074] (1) Preparation of organic admixture:

[0075] The particle size is 200nm, and the mass concentration is 20% styrene, butyl acrylate and acrylic acid are obtained by emulsion polymerization, and the polymer nanoparticle aqueous dispersion liquid is put into the three-neck flask of 25 ℃ water bath constant temperature, oxidized with 1mol / L hydrogen Sodium solution adjusts the pH of the copolymer solution to 10, first dropwise add a calcium nitrate solution with a mass concentration of 40%, after the dropwise addition is completed, co...

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Abstract

The invention discloses high-performance cement mortar. The high-performance cement mortar comprises, by weight, 26-40 parts of cement, 50-60 parts of river sand, 2-5 parts of an organic admixture, 1-3 parts of modified coconut fibers, 1-4 parts of an antifreezing agent, 1-2 parts of fatty acid monoglyceride, 0.8-1.5 parts of sodium tetraborate, 1-2 parts of calcium chloride and 10-30 parts of water, wherein the organic admixture is prepared from polymers, soluble metal salt and soluble metal silicate through the dropwise addition reaction. The invention further discloses a preparation method of the high-performance cement mortar. As for the cement mortar provided by the invention, the early strength is high, the post strength cannot be reduced, the toughness and permeation resistance of the cement mortar are good, the preparation method is simple, and cost is low.

Description

[0001] Technical field: [0002] The invention relates to the field of building materials, in particular to a high-performance cement mortar. [0003] Background technique: [0004] Cement mortar is a heterogeneous brittle material with a porous structure. During the hardening process, it has high brittleness, low tensile and compressive strength ratio, large dry shrinkage deformation, low elongation, poor crack resistance, low bond strength, impermeability, and corrosion resistance. However, the disadvantages such as poor performance limit its application range. [0005] It is an effective way to modify cement mortar with polymer. A large number of experiments have proved that the introduction of polymer-based additives such as polymer emulsion and redispersible polymer powder into ordinary cement mortar will cause a series of changes in the properties of cement mortar. Such as, increased flexural strength, reduced compressive strength, reduced rigidity, enhanced flexibility,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B20/02C04B18/24C04B24/26
CPCC04B18/24C04B20/023C04B28/00C04B40/0039C04B14/068C04B2103/601C04B24/045C04B22/0013C04B22/124C04B22/002C04B24/2647C04B22/085C04B22/08C04B24/2658C04B24/2688Y02W30/91
Inventor 李风浪李舒歆
Owner DONGGUAN LIANZHOU INTPROP OPERATION MANAGEMENT CO LTD
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