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Air-setting and hydraulic Portland cement

A Portland cement and gas condensing water technology, applied in cement production and other directions, can solve the problems of high cost and uncontrollable setting time of wet-mixed mortar, and achieve the effects of increasing equipment cost, good construction performance and improving construction efficiency.

Active Publication Date: 2016-07-20
JIAHUA SPECIAL CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the defects of high cost of existing cement mortar and uncontrollable setting time of wet-mixed mortar, the present invention provides an air-setting hydraulic Portland cement. Non-condensing, ready-to-use and setting effect; and during the opening time, the mortar has good construction performance, which can effectively improve the construction efficiency and greatly reduce the production cost. At the same time, the mortar requires less raw materials and is easy to control during production

Method used

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  • Air-setting and hydraulic Portland cement

Examples

Experimental program
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Effect test

Embodiment 1

[0023] In this embodiment, the air-setting hydraulic Portland cement includes the following components in weight percentage:

[0024] Ordinary Portland cement: 85%

[0025] Slaked lime: 5%

[0026] Bentonite: 2%

[0027] Fly ash: 7.915%

[0028] Hydroxyethyl cellulose ether: 0.07%

[0029] Air-entraining agent: 0.015%.

[0030] The slaked lime is calcareous slaked lime, and in the slaked lime, the sum of the mass percentages of calcium oxide and magnesium oxide is 85%.

[0031] The bentonite is sodium-based bentonite with a water absorption rate of 350% and a sieve residue of 5% at 80 μm.

[0032] The water requirement ratio of the fly ash is 114%, and the 80μm sieve residue is 8%.

[0033] After testing, the technical parameters of the air-setting hydraulic Portland cement in this example are (for the experimental method, refer to GB / T1346-2001 cement standard consistency water consumption, setting time, stability test method and GB / T17671-1999 cement Mortar strength t...

Embodiment 2

[0039] In this embodiment, the air-setting hydraulic Portland cement includes the following components in weight percentage:

[0040] Ordinary Portland cement: 88%

[0041] Slaked lime: 4%

[0042] Bentonite: 0.9%

[0043] Fly ash: 7%

[0044] Hydroxyethyl cellulose ether: 0.092%

[0045] Air-entraining agent: 0.008%.

[0046] The slaked lime is calcareous slaked lime, and in the slaked lime, the sum of the mass percentages of calcium oxide and magnesium oxide is 88.5%.

[0047] The bentonite is sodium-based bentonite with a water absorption rate of 301% and a sieve residue of 7.5% at 80 μm.

[0048] The water requirement ratio of the fly ash is 113%, and the sieve residue of 80 μm is 9.5%.

[0049] After testing, the technical parameters of the air-setting hydraulic Portland cement in this embodiment are:

[0050] Initial setting time: 138min, final setting time: 200min;

[0051] 3d compressive strength: 27.5MPa, 3d flexural strength: 4.2MPa;

[0052] 28d compressive...

Embodiment 3

[0055] In this embodiment, the air-setting hydraulic Portland cement includes the following components in weight percentage:

[0056] PI type Portland cement: 69.9%

[0057] Slaked lime: 5.015%

[0058] Bentonite: 4%

[0059] Fly ash: 21%

[0060] Hydroxyethyl cellulose ether: 0.07%

[0061] Air-entraining agent: 0.015%.

[0062] The slaked lime is calcareous slaked lime, and in the slaked lime, the sum of the mass percentages of calcium oxide and magnesium oxide is 88%.

[0063] The bentonite is sodium-based bentonite with a water absorption rate of 320% and a sieve residue of 6% at 80 μm.

[0064] The water requirement ratio of the fly ash is 110%, and the sieve residue of 80 μm is 6%.

[0065] After testing, the technical parameters of the air-setting hydraulic Portland cement in this embodiment are:

[0066] Initial setting time: 150min, final setting time: 226min;

[0067] 3d compressive strength: 24.0MPa, 3d flexural strength: 4.0MPa;

[0068] 28d compressive stre...

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Abstract

The invention relates to an air-setting and hydraulic Portland cement. The air-setting and hydraulic Portland cement comprises, by weight, 69.9 to 98.4% of cement, 1 to 5% of calcium hydroxide, 0.5 to 4% of bentonite, 0 to 21% of fly ash, 0.03 to 0.07% of hydroxyethyl cellulose ether and 0.005 to 0.015% of an air-entrainer. Wet-mixed mortar prepared by mixing the air-setting and hydraulic Portland cement provided by the invention, machine-made sand, a water reducer, a delayed coagulant and fly ash in a proper ratio with water has the characteristics of coagulation in an air environment and normal coagulation after open time and realizes non-coagulation within open time when not in use and immediate coagulation upon usage; in the open time, the motor has good construction performance, so construction efficiency can be effectively improved, and production cost is substantially reduced; and since few raw materials are used, easy controllability is realized in production.

Description

technical field [0001] The invention relates to a preparation method of building materials, in particular to an air-setting hydraulic Portland cement. Background technique [0002] Mortar is a basic building material in the construction industry and is widely used in construction engineering. In June 2007, six ministries and commissions including the Ministry of Commerce and the Ministry of Housing and Urban-Rural Development jointly issued the "Notice on Prohibiting On-Site Mixing of Mortar in Some Cities within a Time Limit". Under this background, commercial wet-mixed mortar ushered in development opportunities. [0003] Relying on the production line of commercial concrete, wet-mixed mortar makes full use of the idle time of commercial mixing station equipment for night production. This special production method determines that the mortar has the characteristics of good water retention performance, long setting time and water collection time. However, workers have alread...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/26
CPCY02P40/10
Inventor 许毅刚王宁夏艳晴古安林陈雪梅
Owner JIAHUA SPECIAL CEMENT