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High-tenacity cement mortar and preparation method thereof

A cement mortar, high toughness technology, applied in the field of building materials, can solve problems such as reducing brittleness, and achieve the effects of low cost, environmental friendliness, and rich raw material sources

Inactive Publication Date: 2017-09-26
FUJIAN JIANGXIA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for cement mortar, due to the lack of aggregate components, it is more brittle than ordinary concrete, and it also has the limitations of ordinary concrete, such as the greater the strength, the greater the brittleness, so how to get a high strength At the same time, there are certain technical bottlenecks in cement mortar suitable for engineering applications, and it is necessary to add better toughening materials to reduce its brittleness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 Preparation of Activated Halloysite Nanotubes

[0029] a) Take the halloysite nanotubes, mechanically pulverize them and screen them with 350 mesh before use;

[0030] b) Put 60 stainless steel balls with a diameter of 5 mm and 50 stainless steel balls with a diameter of 10 mm in two identical 15 L nylon tanks, and then add the halloysite nanotubes obtained in step a) respectively 6 kg, then add 600 mL of absolute ethanol dropwise, and seal it with a nylon cover; put two ball mill jars symmetrically into the planetary ball mill, and ball mill for 40 minutes under the condition that the rotation speed is 350 rpm and the rotation direction is automatically changed every 30 minutes. After h, short-cut halloysite nanotubes with an average length of 200-230 nm are obtained;

[0031] c) The chopped halloysite nanotubes obtained in step b) were added to an aqueous solution of Tween 20 with a pH of 8 and a concentration of 15 wt%, sonicated for 24 h, filtered, washed...

Embodiment 2

[0032] Example 2 Preparation of toughened material

[0033] 1) Dissolve 30 kg of the activated halloysite nanotubes obtained in Example 1 and 60 kg of thionyl chloride in 200 L of N-methylpyrrolidone, stir at 45 °C for 12 hours, and then clean them with a 40 kHz, 200 KW ultrasonic wave Sonicate in the machine at 75 °C for 13 h, then centrifuge at 4500 rpm for 35 min, separate the solid and wash it with carbon tetrachloride, then dry it in vacuum at 25 °C for 30 h;

[0034]2) Mix 30 kg of halloysite nanotubes treated in step 1) with 8 kg of ethylenediamine and 6 L of triethylamine in 200 L of N-methylpyrrolidone, stir at 50 °C for 12 h, and then Under protection, in a 20 kHz, 150 KW ultrasonic cleaning machine at 75 °C for 8 h, distill off triethylamine and N-methylpyrrolidone under reduced pressure, and then wash with the mixed solvent R Dry under vacuum for 24 h;

[0035] 3) Mix 20 kg of halloysite nanotubes treated in step 2) and 5 kg of cyanuric chloride in 200 L of tetra...

Embodiment 3

[0038] Example 3 Preparation of High Toughness Cement Mortar

[0039] First add 80 parts by weight of cement, 120 parts by weight of fine sand of 50-200 mesh, and 10 parts by weight of fly ash into the mixer, and dry stir for 2-3 minutes; then add 15 parts by weight of water-based polyurethane, 15 parts by weight of toughening material, and 1.5 parts by weight of strong agent, 3 parts by weight of polyacrylate, 2 parts by weight of raw gypsum, 0.4 parts by weight of sodium dodecylbenzenesulfonate, 0.9 parts by weight of water reducing agent and 50 parts by weight of water, continue to stir for 5-10 minutes before proceeding Construction; After 28 days of standard cultivation, the finished cement mortar is obtained.

[0040] After testing, the compressive strength, flexural strength, bond strength, water absorption and shrinkage of the obtained finished cement mortar were 45.35MPa, 20.8MPa, 3.85MPa, 0.36% and 0.39% respectively.

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Abstract

The invention discloses high-tenacity cement mortar and a preparation method thereof. The high-tenacity cement mortar is characterized in that on the basis of taking cement, fine sand, polyacrylic ester and gypsum as raw materials of cement mortar, hydroxyethyl cellulose is utilized to modify halloysite subjected to activating treatment, so that the modified halloysite can not only be fully dispersed in cement mortar but also endow the cement mortar with favorable tenacity, isotropy and fatigue resistance, and accordingly, the high-performance cement mortar is prepared.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a high-toughness cement mortar and a preparation method thereof. Background technique [0002] Ordinary mortar has a low tension-compression ratio, large dry shrinkage deformation, poor impermeability, crack resistance, corrosion resistance, and high density, so its application range is greatly restricted. With the development of industry, to further improve the performance of mortar, it is necessary to improve the performance of cementing materials, so polymer mortar appeared. Use polymers to modify cement mortar so that while maintaining the advantages of the original inorganic materials of cement, such as compressive strength, flexural strength, and aging resistance, organic materials with strong cohesive force, good deformability, and strong sealing are added. characteristics, so that the cohesive force, frost resistance and impermeability of cement mortar have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B20/02
CPCC04B28/00C04B20/023C04B2201/50C04B14/06C04B18/08C04B24/282C04B14/10C04B2103/12C04B24/2641C04B22/143C04B24/20C04B2103/302C04B22/002
Inventor 蒋国平肖三霞
Owner FUJIAN JIANGXIA UNIV
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