Preparation method of anti-crack low-shrinkage cement mortar

A cement mortar and low shrinkage technology, applied in the field of cement mortar materials, can solve the problems of low compressive strength, poor crack resistance, and easy microcracks, etc., and achieve the effect of improving dispersion performance and improving hydrophilicity

Inactive Publication Date: 2019-11-19
李魁
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main technical problem to be solved by the present invention is to provide a kind of crack-resistant low-cracking-resistance, aiming at the defects that the current cement mortar has large drying shrinkage and deformation after hardening, and microcracks are prone to occur locally, resulting in low compressive strength and poor crack resistance. The preparation method of shrinkage cement mortar

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of coarse wood flour:

[0030] Take 200g of straw residue and 400mL of sodium hydroxide solution with a mass fraction of 45% and put them into a water bath reactor with a stirrer, heat the water bath to 90°C, start the stirrer, stir for 3h, filter, remove the filter residue and use the obtained filtrate The glacial acetic acid with a mass fraction of 95% was neutralized to neutral to obtain a lignin suspension, which was centrifuged at a high speed of 3500r / min for 12 minutes to remove the supernatant and separate the lower precipitate, which was washed twice with water and placed in In an oven with a set temperature of 70°C, dry for 4 hours to obtain coarse wood powder;

[0031] Preparation of product:

[0032] In parts by weight, add 70 parts of β-cyclodextrin and 100 parts of sodium hydroxide solution with a mass fraction of 90% to the beaker, stir at room temperature for 10 minutes, then add 5 parts of glycidyl trimethyl chloride Ammonium, put the beaker...

Embodiment 2

[0040] Preparation of coarse wood flour:

[0041] Take 215g of straw residue and 425mL of sodium hydroxide solution with a mass fraction of 45% and put them into a water bath reaction kettle with a stirrer, heat the water bath to 92.5°C, start the stirrer, stir for 4h, filter, remove the filter residue and use the obtained filtrate The glacial acetic acid with a mass fraction of 95% was neutralized to neutral to obtain a lignin suspension, which was centrifuged at a high speed of 3600r / min for 13.5min to remove the supernatant and separate the lower precipitate, which was washed with water for 2.5 times and placed in In an oven with a set temperature of 75°C, dry for 4.5 hours to obtain coarse wood powder;

[0042] Preparation of product:

[0043] In parts by weight, add 72.5 parts of β-cyclodextrin and 115 parts of sodium hydroxide solution with a mass fraction of 90% to the beaker, stir at room temperature for 12.5 minutes, and then add 7.5 parts of epoxypropyl trimethyl ch...

Embodiment 3

[0051] Preparation of coarse wood flour:

[0052] Take 230g of straw residue and 450mL of sodium hydroxide solution with a mass fraction of 45% and put them into a water bath reactor with a stirrer, heat the water bath to 95°C, start the stirrer, stir for 5h, filter, remove the filter residue and use the obtained filtrate The glacial acetic acid with a mass fraction of 95% was neutralized to neutral to obtain a lignin suspension, which was centrifuged at a high speed of 3700r / min for 15 minutes to remove the supernatant and separate the lower precipitate, which was washed with water for 3 times and placed in In an oven with a set temperature of 80°C, dry for 5 hours to obtain coarse wood powder;

[0053] Preparation of product:

[0054] In parts by weight, add 75 parts of β-cyclodextrin and 130 parts of sodium hydroxide solution with a mass fraction of 90% to the beaker, stir at room temperature for 15 minutes, then add 10 parts of glycidyl trimethyl chloride ammonium, place...

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PUM

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Abstract

The invention belongs to the field of cement mortar materials, and particularly relates to a preparation method of anti-crack low-shrinkage cement mortar. According to the invention, waste straw is used as a raw material; carbonized wood fibers, mixed aggregate, coarse wood powder, hydroxymethyl cellulose, triethylamine and sodium sulfite are added into water and then stirred and dispersed to obtain the anti-crack low-shrinkage cement mortar. An organic viscosity reducer used in the invention is quaternary ammonium type cationic cyclodextrin, so the shrinkage amount of the cement mortar is reduced, and cracking of the cement mortar is avoided. The coarse wood powder recovered from straw residues contains a large amount of lignin; on one hand, as a modifying substance for cyclodextrin, thecoarse wood powder improves the dispersion performance of cyclodextrin; on the other hand, sulfonic acid groups are introduced into lignin molecules, so high dispersion of cement particles and uniformdensity of slurry can be kept, and shrinkage amount in a later solidification period is reduced; in addition, since a certain amount of lignin is added, the deposition density of cyclodextrin duringbonding of a construction surface is improved, the compressive strength of the cement mortar is enhanced, and the cement mortar has wide application prospects.

Description

technical field [0001] The invention belongs to the field of cement mortar materials, and in particular relates to a preparation method of crack-resistant and low-shrinkage cement mortar. Background technique [0002] Cement products are cement deep-processing products with a large volume and wide range. Because of their wide source of raw materials, long corrosion resistance life, low maintenance costs, energy saving and environmental protection, etc., they have become an indispensable and important building material product in national economic construction. In recent years, with the continuous development of urbanization, large-scale urban construction has brought opportunities to the development of the cement product industry, and cement artistic products such as cement fences and garden landscape projects will also be widely used in construction, water conservancy, In the construction of transportation, landscaping and other projects, cement products have become an indi...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B24/24C04B24/38C04B111/20
CPCC04B24/24C04B24/38C04B28/04C04B2111/20C04B2201/50C04B24/383C04B24/121C04B22/14C04B14/386C04B14/06C04B14/185
Inventor 李魁
Owner 李魁
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