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Cementing material with low-temperature resistance and preparation method thereof

A gelling material, low temperature resistance technology, applied in the field of building materials, can solve problems such as poor compressive strength, achieve the effect of solving poor compressive strength, ensuring early compressive strength, and excellent low temperature resistance

Pending Publication Date: 2020-04-10
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of poor early compressive strength in low temperature engineering, the invention provides a quaternary system gelling material with low temperature resistance and good mechanical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A cementitious material with low temperature resistance is composed of the following raw materials in parts by weight: 42.5 parts of sulphoaluminate cement clinker, 7.5 parts of anhydrite gypsum, 35 parts of monomineral anhydrous calcium sulphoaluminate, and 15 parts of dihydrate gypsum , 50 parts of antifreeze.

[0027] Wherein the single mineral anhydrous calcium sulfoaluminate preparation method is:

[0028] Mix the pure chemical reagents calcium carbonate, aluminum hydroxide and calcium sulfate in a molar ratio of 3:6:1, add deionized water no more than 10% of the total mass of calcium carbonate, aluminum hydroxide and calcium sulfate, and press it at 105 Dry at ℃ for 12 hours, put it in a high-temperature furnace at 1320 ℃ for 1.5 hours, take out the clinker and cool it to room temperature, then grind it through an 80 μm square hole sieve and put it into a closed container.

[0029] Wherein antifreeze preparation method is:

[0030] The NaCl solution prepared at ...

Embodiment 2

[0039] A cementitious material with low temperature resistance is composed of the following raw materials in parts by weight: 42.5 parts of sulphoaluminate cement clinker, 7.5 parts of anhydrite, 40 parts of monomineral anhydrous calcium sulphoaluminate, 10 parts of dihydrate gypsum, Antifreeze 50 parts.

[0040] Wherein the single mineral anhydrous calcium sulfoaluminate preparation method is:

[0041] Mix the pure chemical reagents calcium carbonate, aluminum hydroxide and calcium sulfate in a molar ratio of 3:6:1, add deionized water no more than 10% of the total mass of calcium carbonate, aluminum hydroxide and calcium sulfate, and press it at 105 Dry at ℃ for 12 hours, put it in a high-temperature furnace at 1320 ℃ for 1.5 hours, take out the clinker and cool it to room temperature, then grind it through an 80 μm square hole sieve and put it into a closed container.

[0042] Wherein antifreeze preparation method is:

[0043] The NaCl solution prepared at -15°C is in a flu...

Embodiment 3

[0051] A cementitious material with low temperature resistance is composed of the following raw materials in parts by weight: 42.5 parts of sulfoaluminate cement, 7.5 parts of anhydrite, 45 parts of monomineral anhydrous calcium sulfoaluminate, 5 parts of dihydrate gypsum, antifreeze 50 servings.

[0052] Wherein the single mineral anhydrous calcium sulfoaluminate preparation method is:

[0053] Mix the pure chemical reagents calcium carbonate, aluminum hydroxide and calcium sulfate in a molar ratio of 3:6:1, add deionized water no more than 10% of the total mass of calcium carbonate, aluminum hydroxide and calcium sulfate, and press it at 105 Dry at ℃ for 12 hours, put it in a high-temperature furnace at 1320 ℃ for 1.5 hours, take out the clinker and cool it to room temperature, then grind it through an 80 μm square hole sieve and put it into a closed container.

[0054] Wherein antifreeze preparation method is:

[0055] The NaCl solution prepared at -15°C is in a fluid sta...

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Abstract

The invention provides a cementing material with low-temperature resistance and a preparation method. The cementing material is prepared from sulphoaluminate cement clinker, anhydrite, monomineral anhydrous calcium sulphoaluminate, dihydrate gypsum and other additives. The cementing material disclosed by the invention adopts a sulphoaluminate clinker-anhydrite-anhydrous calcium sulphoaluminate-dihydrate gypsum quaternary system, so that the development of the strength of the cementing material at negative temperature is facilitated. The cementing material disclosed by the invention is subjected to hydration reaction at negative temperature to generate an ettringite crystal phase, so that the cementing material has excellent early compressive strength, and the cementing material is suitablefor construction in a low-temperature environment in winter. According to the formula of the cementing material, the problem of poor hydration performance in a negative temperature environment is effectively solved, and the cementing material has excellent negative temperature strength performance. The cementing material is safe, environment-friendly, non-toxic, pollution-free and convenient to operate and has remarkable application value and economic benefit.

Description

technical field [0001] The present invention relates to a cementitious material, in particular to a cementitious material with low-temperature resistance, which consists of a quaternary system of sulphoaluminate cement clinker-anhydrite-single mineral anhydrous calcium sulphoaluminate-dihydrate gypsum. It belongs to the field of building materials. Background technique [0002] The hydration rate of Portland cement-based cementitious materials is slow in low temperature environment, and the formation rate of main hydration products such as C-S-H gel is significantly reduced, which leads to the slow development of early strength of cement stone. Only 7.5MPa, it is difficult to meet the low temperature construction requirements. The sulfoaluminate cement (CSA) has the advantages of fast hydration speed, high early strength and good frost resistance, which just makes up for the shortcomings of ordinary Portland cement in this respect. [0003] The important mineral compositio...

Claims

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Application Information

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IPC IPC(8): C04B28/16C04B40/00C04B40/02C04B111/76
CPCC04B28/16C04B40/0078C04B40/02C04B2111/76C04B2201/50C04B7/32C04B22/14C04B22/143C04B22/124C04B14/06
Inventor 兰明章李敏陈智丰崔素萍王剑锋王亚丽
Owner BEIJING UNIV OF TECH
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