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Preparation method of modified limestone powder for mass concrete

A technology for mass concrete and limestone powder, applied in the field of concrete materials, can solve the problems of large workability loss, low activity and low strength of concrete, and achieve the effects of reducing surface cracking, improving economic value, and reducing the temperature difference between inside and outside.

Active Publication Date: 2021-05-04
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In recent years, limestone powder has been widely used in concrete to reduce the pressure of social environmental protection, but the natural structural defects of limestone powder (irregular structure, low activity) lead to defects such as large loss of concrete workability and low strength after it is mixed into concrete, so scholars A lot of research has been done on modified limestone powder, mainly to solve the above problems

Method used

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  • Preparation method of modified limestone powder for mass concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Dissolve 50g of limestone powder in 200ml of absolute ethanol, add 50g of KH570 and stir at 80°C for 1h; cool down to 65°C, add 242g of prenol polyoxyethylene ether, add 1g of ammonium persulfate, stir for 1.5h, and cool down to room temperature ; Add 0.5 g of PEG-PCL copolymer with a molecular weight of 20,000, stir at high speed for 1 hour, and dry to obtain modified limestone powder.

Embodiment 2

[0032] Dissolve 50g of limestone powder in 200ml of absolute ethanol, add 50g of KH550 and stir at 80°C for 1.5h; cool down to 65°C, add 242g of prenol polyoxyethylene ether, add 1g of ammonium persulfate and stir for 1.5h, drop to Room temperature; add 2.5 g of PEG-PBLA copolymer with a molecular weight of 20,000, stir at high speed for 1 hour, and dry to obtain modified limestone powder.

Embodiment 3

[0034] Dissolve 50g of limestone powder in 200ml of absolute ethanol, add 50g of KH570 and stir at 80°C for 2h; cool down to 65°C, add 242g of hydroxybutyl vinyl ether, add 1g of ammonium persulfate and stir for 1.5h, then cool down to room temperature; add 2.5 g of PEG-PCL copolymer with a molecular weight of 20,000 was stirred at high speed for 1 hour, and dried to obtain modified limestone powder.

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Abstract

The invention discloses a preparation method of modified limestone powder for mass concrete. The preparation method comprises the following steps: heating and stirring limestone powder and a silane coupling agent in an ethanol solution for 1-2 hours: cooling to 60-70 DEG C, adding polyoxyethylene ether and ammonium persulfate, stirring for 1-2 hours, and cooling; adding a high-molecular polymer, and stirring at high speed for 1-2 hours; and drying to remove ethanol to obtain the modified limestone powder. A phase-change material is grafted on the surface of the prepared limestone powder, the limestone powder can be molten into a liquid state within the temperature range of 40-60 DEG C, concrete hydration heat is adsorbed, the temperature rise rate is delayed, when the concrete temperature is lower than 40 DEG C, cooling solidification and heat release are conducted, the inner-surface temperature difference of a concrete structure is reduced, and the surface cracking phenomenon is reduced.

Description

technical field [0001] The invention belongs to the technical field of concrete materials, and in particular relates to a preparation method of modified limestone powder for large-volume concrete. Background technique [0002] The heat of cement hydration in concrete can easily lead to cracks in mass concrete. For some large-scale engineering projects that require mass concrete, concrete cracks can easily adversely affect the safety and stability of concrete structures. It has never stopped at home and abroad. Research on crack control of mass concrete. Phase change materials have heat storage properties and have been widely used in wall insulation materials. Introducing phase change materials into concrete to control the temperature of concrete to avoid damage to concrete due to temperature changes has become a new research topic. [0003] In recent years, limestone powder has been widely used in concrete to reduce the pressure of social environmental protection, but the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/12C04B14/28
CPCC04B20/12C04B14/28C04B20/1051C04B20/1037
Inventor 李兴郑涛王军赵日煦高飞熊龙刑菊香
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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