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A kind of fast-setting rapid-hardening cement mortar and its extrusion process

A technology of fast-hardening cement and extrusion process, applied in the field of building materials, can solve problems such as irritation, and achieve the effects of low production cost and simple preparation process

Active Publication Date: 2017-01-04
唐山市可迈福建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as an amine early strength agent, it is easy to release a pungent ammonia smell

Method used

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  • A kind of fast-setting rapid-hardening cement mortar and its extrusion process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] According to No. 1 formula in Table 1, first weigh 100g of Portland cement and pass it through a 20-mesh standard sieve. Next, 15 g of polyvinylidene fluoride was weighed, added to 105 g of dimethylacetamide, heated to 40° C., and vigorously stirred for 2 hours until the polyvinylidene fluoride was completely dissolved. At this time, the viscosity of the solution was 9 poise. Then, at room temperature, the above solution is added to the cement, and the mixture is stirred continuously until the mixture is uniform, so as to obtain the material for extrusion. The material for extrusion is loaded into an extrusion machine, and continuously extruded into a coagulation bath composed of 50 wt% water and 50 wt% dimethylacetamide, and the cement mortar is rapidly solidified and hardened.

Embodiment 2

[0032] According to No. 2 formula in Table 1, first weigh 25g of Portland cement and 75g of sand, pass through a 20-mesh standard sieve, and mix well. Next, 10 g of polyvinylidene fluoride was weighed, added to 100 g of dimethylformamide, heated to 50° C., and vigorously stirred for 3 hours until the polyvinylidene fluoride was completely dissolved. At this time, the viscosity of the solution was 8 poise. Then, at room temperature, the above solution is added to the cement, and the mixture is stirred continuously until the mixture is uniform, so as to obtain the material for extrusion. The material for extrusion is loaded into an extrusion machine, and continuously extruded into a coagulation bath composed of 80 wt% water and 20 wt% dimethylformamide, and the cement mortar is rapidly solidified and hardened.

Embodiment 3

[0034] According to No. 3 formula in Table 1, first weigh 40g of Portland cement and 60g of sand, pass through a 20-mesh standard sieve, and mix well. Next, 10 g of polyvinylidene fluoride was weighed, added to 70 g of N-methyl-2-pyrrolidone, heated to 60° C., and vigorously stirred for 4 hours until the polyvinylidene fluoride was completely dissolved. At this time, the viscosity of the solution was 15 poise. Then, at room temperature, the above solution is added to the cement, and the mixture is stirred continuously until the mixture is uniform, so as to obtain the material for extrusion. Put the material for extrusion into the extrusion machine, and continuously extrude it into the water, and the cement mortar will quickly solidify and harden.

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Abstract

The invention discloses quick-setting and rapid-hardening cement mortar and an extrusion process thereof, which belongs to the field of building materials. The cement mortar is prepared from Portland cement or ordinary Portland cement, sand, polyvinylidene fluoride and an organic solvent according to a mass ratio of 100:(0-400):(5-50): (50-120). The extrusion process comprises the steps: firstly dissolving the polyvinylidene fluoride in the organic solvent, then, adding the solution into the cement and the sand, stirring and mixing evenly, continuously extruding the cement mortar into a coagulation bath, and the cement mortar solidifies and hardens quickly. The extrusion process is simple in operation and capable of quickly solidifying the cement and the sand, so that the extrusion process can be used in the field of building materials.

Description

technical field [0001] The invention relates to a quick-setting quick-hardening cement mortar and an extrusion process thereof, belonging to the field of building materials. Background technique [0002] In order to meet the needs of special construction or special environment, early strength agents are usually added to increase the hydration speed of cement. According to their chemical composition, accelerators can be divided into three categories: inorganic salts, organic substances and compound types. [0003] Commonly used inorganic salt accelerators include chlorides, sulfates, nitrites, carbonates, etc. Chloride has obvious early-strength effect, and also has a significant effect of lowering the freezing point, but due to the introduction of chloride ions, this type of early-strength agent has a rusting effect on steel bars and has a negative effect on reinforced concrete. Sulfate is one of the widely used early strength agents, among which sodium sulfate and calcium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B24/26
Inventor 张亚彬尹洪江毕江寰王少迪樊文彬曹旭
Owner 唐山市可迈福建材有限公司
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