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Method for preparing cement concrete pavement curing agent

A technology for cement concrete and curing agent, applied in the direction of coating, alginic acid coating, etc., can solve the problems of inability to effectively improve concrete performance, inability to effectively improve concrete performance, low film-forming performance, etc., to avoid excessive drying, reduce Maintenance frequency, shrinkage reduction effect

Inactive Publication Date: 2017-05-31
周益铭
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention is: the traditional concrete curing agent is easily affected by temperature during storage and use, and demulsification occurs during storage, and the film-forming performance is not high during use, resulting in the inability to effectively improve the concrete curing agent. Concrete performance problems, providing a method to prepare cement concrete pavement curing agent by compounding modified rice husk ash and acrylic acid emulsion
During use, the acrylic emulsion can quickly form a film on the concrete pavement to prevent water from overflowing. The modified rice husk ash can penetrate into the concrete gap and react with free calcium oxide in cement and calcium hydroxide, the hydration product, to form crystals and block the concrete. The capillary pores on the surface prevent water loss, which effectively solves the problem that traditional curing agents cannot effectively improve the performance of concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018]Weigh 400g of rice husk, pour it into a beaker filled with 800mL of hydrochloric acid with a mass fraction of 10%, and then place the beaker in a digital speed measuring constant temperature magnetic stirrer at a temperature of 65°C and a speed of 300r / min. Stir for 3 hours, filter, collect the filter residue, and wash the filter residue with deionized water until the washing liquid is neutral, then place the filter residue in an oven, and dry it to constant weight at a temperature of 105°C, then transfer the dried filter residue to carbonization Into the furnace, nitrogen gas was introduced into the furnace at a rate of 10 mL / min, and under nitrogen protection, the temperature was programmed to rise to 550 °C at a rate of 6 °C / min, kept for carbonization for 45 min, cooled to room temperature with the furnace, and discharged to obtain carbonized rice husks; Transfer the carbonized rice husk obtained above into a muffle furnace, heat up to 780°C at a rate of 10°C / min, hea...

example 2

[0021] Weigh 450g of rice husk, pour it into a beaker filled with 900mL of hydrochloric acid with a mass fraction of 10%, and then place the beaker in a digital speed measuring constant temperature magnetic stirrer at a temperature of 68°C and a speed of 400r / min. Stir for 4 hours, filter, collect the filter residue, and wash the filter residue with deionized water until the washing liquid is neutral, then place the filter residue in an oven, dry to constant weight at a temperature of 108°C, and then transfer the dried filter residue to carbonization Into the furnace, nitrogen gas was introduced into the furnace at a rate of 15mL / min. Under nitrogen protection, the temperature was programmed to rise to 580°C at a rate of 7°C / min, kept for carbonization for 50min, cooled to room temperature with the furnace, and discharged to obtain charred rice husks; Transfer the carbonized rice husk obtained above into a muffle furnace, heat up to 790°C at a rate of 12°C / min, heat-preserve an...

example 3

[0024] Weigh 500g of rice husk, pour it into a beaker filled with 1000mL of hydrochloric acid with a mass fraction of 10%, and then place the beaker in a digital speed measuring constant temperature magnetic stirrer at a temperature of 70°C and a speed of 500r / min. Stir for 5 hours, filter, collect the filter residue, and wash the filter residue with deionized water until the washing liquid is neutral, then place the filter residue in an oven, dry to constant weight at a temperature of 110°C, and transfer the dried filter residue to carbonization Into the furnace, nitrogen gas was introduced into the furnace at a rate of 20 mL / min, and under nitrogen protection, the temperature was programmed to rise to 600 °C at a rate of 8 °C / min, kept for carbonization for 60 min, cooled to room temperature with the furnace, and discharged to obtain carbonized rice husks; Transfer the carbonized rice husk obtained above into a muffle furnace, heat up to 800°C at a rate of 15°C / min, heat-pres...

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Abstract

The invention discloses a method for preparing a cement concrete pavement curing agent, and belongs to the technical field of curing agent preparation. The method is as follows: first, cleaning rice husks with an acid, removing impurities, drying, carbonizing under oxygen free conditions, calcining in a muffle furnace to obtain rice husk ash, using ethylene glycol as a grinding aid, adding silane coupling agent for modifying the rice husk ash in ball milling process, using methyl methacrylate as a monomer, sodium dodecylbenzene sulfonate and the like as emulsifiers, and ammonium persulfate as an initiator for preparation of acrylic emulsion, and compoudding the acrylic emulsion and the modified rice husk ash for preparation of the cement concrete pavement curing agent. In the process of using, a film can be fast formed by the acrylic emulsion on a concrete pavement for preventing water overflow, the modified rice husk ash can penetrate into concrete cracks for reacting with free calcium oxide and hydration product calcium hydroxide in cement for formation of crystals so as to block capillary pores on the surface of the cement to prevent water loss, and the problem that traditional curing agents cannot effectively improve the performance of the concrete can be effectively solved.

Description

technical field [0001] The invention discloses a preparation method of a cement concrete pavement curing agent, which belongs to the technical field of curing agent preparation. Background technique [0002] Cement concrete is one of the most used and widely used building materials in construction projects. Its performance depends not only on the composition and ratio of raw materials, but also on later maintenance. If the concrete is not maintained in time after construction, its internal moisture will pass through. The capillary pores of the system evaporate to the outside world, resulting in insufficient hydration of the cementitious material, and the reduction of hydration products, which in turn causes the performance of concrete to decline. Therefore, curing is crucial to the development of concrete properties. [0003] In the initial stage of concrete pouring, the curing agent is like an inhibitor of water evaporation, and with the formation of the film, water vapor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B40/04C08F220/14C08F220/18C08F220/06C08F220/28C09D133/12C09D105/04C09D7/12
CPCC04B40/04C08F220/14C09D133/12C09D7/62C08L5/04C08K9/06C08K9/04C08K3/04C08F220/1804C08F220/06C08F220/282
Inventor 周益铭许丽君
Owner 周益铭
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