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A modified calcium oxide cement concrete expansion agent and its preparation method

A technology of cement concrete and calcium oxide, applied in the field of building materials, can solve problems such as excessive consumption of expansion energy, and achieve the effects of reducing chemical shrinkage, large expansion rate, and wide source of ingredients

Active Publication Date: 2017-02-22
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of excessive consumption of expansion energy of calcium oxide expansion clinker in the plastic stage of concrete, the present invention provides a modified calcium oxide cement concrete expansion agent and a preparation method thereof, which can reduce the ineffectiveness of calcium oxide expansion agent in the plastic stage of cement concrete. Expansion energy, increasing the expansion efficiency of concrete after hardening

Method used

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  • A modified calcium oxide cement concrete expansion agent and its preparation method
  • A modified calcium oxide cement concrete expansion agent and its preparation method
  • A modified calcium oxide cement concrete expansion agent and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Limestone with a mass ratio of 90:10 is mixed with a composite mineralizer and then ground together by a ball mill to a fineness of 200m 2 / kg of raw meal powder, in which the compound mineralizer is gypsum. The ground raw meal powder was calcined at 1200°C, and kept at this temperature for 120 minutes (that is, the calcination time at 1200°C was 120 minutes). Fineness is 200m 2 / kg to obtain calcium oxide expansion clinker.

[0031] The calcium oxide expanded clinker that will make is added in the dichloromethane solution of the polylactic acid that the number average molecular weight is 5kg / mol, and the mass ratio of calcium oxide and polylactic acid is 99:1, removes solvent dichloromethane after stirring 5min, The obtained solid is ground to a specific surface area of ​​500m 2 / kg, sealed and packaged to obtain the modified calcium oxide cement concrete expansion agent 1 of the present invention.

[0032] As a comparison, the above-mentioned calcium oxide-based e...

Embodiment 2

[0034] Limestone with a mass ratio of 99:1 is mixed with a composite mineralizer and then ground together by a ball mill to a fineness of 100m 2 / kg of raw meal powder, wherein the composite mineralizer is gypsum / alumina / aluminum sulfate with a mass ratio of 50:25:25. The ground raw meal powder is calcined at 1350°C, and kept at this temperature for 60 minutes. After the heat preservation is completed, the fired sample is immediately taken out and quenched in the air, and ground to a fineness of 100m 2 / kg to obtain calcium oxide expansion clinker.

[0035]Add the prepared calcium oxide-based expanded clinker into a chloroform solution of polyε-caprolactone (PCL) with a number average molecular weight of 10 kg / mol, the mass ratio of calcium oxide to PCL is 95:5, and stir for 5 minutes The solvent trichloromethane was removed, and the obtained solid was ground to a specific surface area of ​​600m 2 / kg, sealed and packaged to obtain the modified calcium oxide cement concrete ...

Embodiment 3

[0038] Mix the limestone with a mass ratio of 95:5 and the composite mineralizer, and then grind them together with a ball mill to a fineness of 600m 2 / kg of raw meal powder, wherein the composite mineralizer is gypsum / aluminum sulfate / alumina with a mass ratio of 30:50:20. Calcinate the ground raw meal powder at 1450°C, and keep it at this temperature for 40 minutes. After the heat preservation is over, take out the fired sample and quench it in the air, and grind it to a fineness of 600m 2 / kg to obtain calcium oxide expansion clinker.

[0039] Add the prepared calcium oxide-based expanded clinker into a tetrahydrofuran solution of polylactic-co-glycolic acid (PLGA) with a number-average molecular weight of 50kg / mol, the mass ratio of calcium oxide to PLGA is 90:10, stir for 15min and remove Solvent tetrahydrofuran, the obtained solid is ground to a specific surface area of ​​450m 2 / kg, sealed and packaged to obtain the modified calcium oxide cement concrete expansion ag...

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Abstract

The invention provides a modified calcium oxide expansion agent for cement concrete. The modified calcium oxide expansion agent for the cement concrete has the specific surface area of 100-600m<2> / kg and is prepared from a degradable high polymer and calcium oxide expansion clinker. According to the modified calcium oxide expansion agent for the cement concrete, provided by the invention, the invalid hydration of calcium oxide at a plastic stage of concrete is reduced, the hardened expansion quantity is increased, and the shelf life of the product can be further prolonged; the expansion agent can be applied to the crack resisting and seepage prevention of a concrete structure and can be used for greatly improving the durability of the concrete.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a modified calcium oxide cement concrete expansion agent and a preparation method thereof. Background technique [0002] Cement concrete is currently the largest building material in the world, with low price and wide application. However, cement concrete is easy to shrink and crack, which shortens the service life of engineering structures and seriously affects the durability of concrete. In order to solve the problem that cement concrete is easy to shrink and crack, researchers have invented expansive cement and cement concrete expansion agent. Since the invention of expansive cement in France in the 1930s, especially since Japan separated the expansive component on the basis of expansive cement as a separate expansion agent, the concrete expansive agent has gradually developed into the largest amount used in the concrete industry. One of the admixtures, it is widely used in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/06
Inventor 刘加平王瑞张守治程俊王育江王洪松蒋永菁
Owner JIANGSU SOBUTE NEW MATERIALS
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