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Special air-setting hydraulic Portland cement for wet-mixed mortar

A Portland cement and wet-mixing mortar technology, which is applied in the field of air-setting hydraulic Portland cement for wet-mixing mortar, can solve the problems of uncontrollable setting time and high cost of wet-mixing mortar, and achieve good construction performance, The effect of increasing equipment cost 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 specially used for wet-mixed mortar. The wet-mixed mortar prepared with this cement has Due to the characteristics of condensation in the air environment and normal condensation after the opening time, the mortar realizes the effect of non-condensation and instant setting during the opening time; during the opening time, the mortar has good construction performance, which can effectively improve the construction efficiency and greatly reduce Production cost, while less raw materials, easy to control during production

Method used

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  • Special air-setting hydraulic Portland cement for wet-mixed mortar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this embodiment, the air-setting hydraulic Portland cement includes the following components in weight percentage:

[0026] PI type Portland cement: 74.985%

[0027] Slaked lime: 5%

[0028] Bentonite: 5%

[0029] Fly ash: 11%

[0030] Silica fume: 3.9%

[0031] Air-entraining agent: 0.015%

[0032] Polyvinyl alcohol: 0.1%.

[0033] The slaked lime is calcareous slaked lime, and the sum of the mass percentages of calcium oxide+magnesia in the slaked lime is 85%.

[0034] The bentonite is sodium-based bentonite with a water absorption rate of 305% and a sieve residue of 6% at 80 μm.

[0035] The water requirement ratio of the fly ash is 110%, and the sieve residue of 80 μm is 9%.

[0036] The mass percent of silicon dioxide in the described silica fume is 86%, and the specific surface area is 16m 2 / g, the activity index is 108%.

[0037] After testing, the technical parameters of the air-setting hydraulic Portland cement in this example are (for the experime...

Embodiment 2

[0043] In this embodiment, the air-setting hydraulic Portland cement includes the following components in weight percentage:

[0044] PⅡ type Portland cement: 79.985%

[0045] Slaked lime: 5%

[0046] Bentonite: 5%

[0047] Fly ash: 6%

[0048] Silica fume: 3.9%

[0049] Air-entraining agent: 0.015%

[0050] Polyvinyl alcohol: 0.1%.

[0051] The slaked lime is calcareous slaked lime, and the sum of the mass percentages of calcium oxide+magnesia in the slaked lime is 86%.

[0052] The bentonite is sodium-based bentonite with a water absorption rate of 320% and a sieve residue of 6% at 80 μm.

[0053] The water requirement ratio of the fly ash is 114%, and the 80μm sieve residue is 8%.

[0054] The mass percent of silicon dioxide in the described silica fume is 86%, and the specific surface area is 18m 2 / g, the activity index is 106%.

[0055] After testing, the technical parameters of the air-setting hydraulic Portland cement in this embodiment are:

[0056] Initial ...

Embodiment 3

[0061] In this embodiment, the air-setting hydraulic Portland cement includes the following components in weight percentage:

[0062] Ordinary Portland cement: 85%

[0063] Slaked lime: 2.5%

[0064] Bentonite: 1.7%

[0065] Fly ash: 8%

[0066] Silica fume: 2.7%

[0067] Air-entraining agent: 0.015%

[0068] Polyvinyl alcohol: 0.085%.

[0069] The slaked lime is calcareous slaked lime, and the sum of the mass percentages of calcium oxide+magnesia in the slaked lime is 88%.

[0070] The bentonite is sodium-based bentonite with a water absorption rate of 330% and a sieve residue of 5% at 80 μm.

[0071] The water requirement ratio of the fly ash is 105%, and the sieve residue of 80 μm is 9%.

[0072] The mass percent of silicon dioxide in the described silica fume is 88%, and the specific surface area is 18m 2 / g, the activity index is 110%.

[0073] After testing, the technical parameters of the air-setting hydraulic Portland cement in this embodiment are:

[0074] Ini...

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Abstract

The invention relates to a special air-setting hydraulic Portland cement for wet-mixed mortar. The special air-setting and hydraulic Portland cement comprises, by weight, 75 to 95% of cement, 1 to 5% of calcium hydroxide, 1.5 to 6% of bentonite, 0 to 8% of fly ash, 0.5 to 3.9% of silica fume, 0.005 to 0.015% of an air-entrainer and 0.03 to 0.2% of polyvinyl alcohol. The wet-mixed mortar prepared by blending 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 method for preparing building materials, in particular to an air-setting hydraulic Portland cement specially used for wet-mixed mortar. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/06
Inventor 许毅刚王田堂林燕夏艳晴王宁古安林
Owner JIAHUA SPECIAL CEMENT