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Novel additive for cement mortar and application method of novel additive

A cement mortar and additive technology, which is applied in the field of new cement mortar additives, can solve the problems of fast hardening cement strength decline quickly, and the hydration speed cannot be increased, so as to achieve the goal that the final strength will not decrease, the workload can be reduced, and the setting time can be adjusted Effect

Inactive Publication Date: 2015-01-07
JINGDEZHEN CERAMIC INSTITUTE
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AI Technical Summary

Problems solved by technology

[0002] Cement is a widely used hydraulic material. It is used in a huge amount in building construction and road laying. With the rapid development of science and technology, higher requirements are put forward for the hydration and strength properties of cement. In the traditional low water-cement ratio In some cases, although watering is repeated during the middle and later stages of the cement hydration process, the hydration rate cannot be increased; when the mortar is required to be quickly solidified and shaped, fast-hardening cement is often used, but the strength of the fast-hardening cement decreases in the middle and late stages. Faster, it is difficult to meet the requirements of the market

Method used

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  • Novel additive for cement mortar and application method of novel additive

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: the preparation of Portland cement concrete when the water-cement ratio is 1:1

[0015] The first step: add acrylamide (AM) and N,N'-methylenebisacrylamide (MBAM) to water at a weight ratio of 5:1 to prepare a 50% premix;

[0016] Step 2: Commercially available No. 425 Portland cement powder, configure cement mortar according to the water-cement ratio of 1:1, then weigh 5% of the mortar weight and mix it with the cement mortar and mix it evenly;

[0017] The third step: according to the weight ratio, add 0.08wt% concentration of 10wt% ammonium persulfate (APS) solution and 0.02wt% concentration of 10wt% N,N,N',N'- Tetramethylethylenediammonium (TEMED) solution, stir quickly and evenly.

[0018] Step 4: The mortar obtained in Step 3 is poured into the model within 1 hour to complete the molding operation.

[0019] The cement slurry in the model will be initially set within 30 minutes. When no additives are added, the above cement is mixed according to th...

Embodiment 2

[0021] Embodiment 2: the preparation of Portland cement concrete when the water-cement ratio is 1: 1.2

[0022] Step 1: Add acrylamide (AM) and N,N'-methylenebisacrylamide (MBAM) to water at a weight ratio of 12:1 to prepare a 50% premix;

[0023] The second step: commercially available No. 425 Portland cement powder, according to the water-cement ratio of 1 ︰ 1.2 Configure cement mortar, then weigh 8% of the weight of the mortar and mix it with the cement mortar and stir evenly;

[0024] The third step: according to the weight ratio, add 0.15wt% concentration of 10wt% ammonium persulfate (APS) solution and 0.02wt% concentration of 10wt% N,N,N',N'- Tetramethylethylenediammonium (TEMED) solution, stir quickly and evenly.

[0025] Step 4: The mortar obtained in Step 3 is poured into the model within 1 hour to complete the molding operation.

[0026] The cement slurry in the model will be initially set within 40 minutes. When no additives are added, the above cement will hav...

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Abstract

The invention relates to a novel additive for cement mortar and an application method of the novel additive. The additive is composed of the following components by weight percent: 1-5wt% of acrylamide (AM), 0.2-1wt% of N,N'-methylene bisacrylamide (MBAM), 0.02-0.2wt% of ammonium persulfate (APS) and 0.02wt% of N, N, N',N'-tetramethylethylenediamine (TEMED). The problems that repeated watering and water replenishing are required in the process of cement hydration and the hydration speed is slow in the middle and later periods of cement under the condition of low water-cement ratio, and the like are solved. The setting time is effectively adjusted, the intensity in the early and middle periods is improved, and the ultimate strength of components is not reduced is ensured, and therefore, the additive has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of cement mortar preparation, and in particular relates to a novel additive for cement mortar and a using method thereof. Background technique [0002] Cement is a widely used hydraulic material. It is used in a huge amount in building construction and road laying. With the rapid development of science and technology, higher requirements are put forward for the hydration and strength properties of cement. In the traditional low water-cement ratio In some cases, although watering is repeated during the middle and later stages of the cement hydration process, the hydration rate cannot be increased; when the mortar is required to be quickly solidified and shaped, fast-hardening cement is often used, but the strength of the fast-hardening cement decreases in the middle and late stages. Faster, it is difficult to meet the requirements of the market. Contents of the invention [0003] The technical problem to be solved b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B24/26
Inventor 石棋
Owner JINGDEZHEN CERAMIC INSTITUTE
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