A kind of modified dolomite powder-based mineral admixture and preparation method thereof

A technology of mineral admixture and dolomite powder, applied in the field of concrete, can solve the problems of poor fluidity and strength drop of concrete, and achieve the effects of reducing durability reduction, improving fluidity, and improving workability

Inactive Publication Date: 2019-04-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problems such as poor concrete fluidity and reduced strength easily caused by high dosage of dolomite, the invention provides a modified dolomite powder-based mineral admixture (the invention is also referred to as admixture for short); thus, waste Dolomite powder can reduce the cost of concrete preparation and ensure the working performance, mechanical properties and durability of dolomite powder concrete

Method used

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  • A kind of modified dolomite powder-based mineral admixture and preparation method thereof
  • A kind of modified dolomite powder-based mineral admixture and preparation method thereof
  • A kind of modified dolomite powder-based mineral admixture and preparation method thereof

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Effect test

Embodiment 1

[0034] The percentage by weight of each component of a modified dolomite powder-based mineral admixture is: Blaine specific surface area is 397m 2 / kg of dolomite powder (CaCO 3 · MgCO 3 The mass percentage content is not less than 75%) 60%; 0.045mm square hole sieve residue is 10% I grade fly ash 17%; S95 grade slag powder 17%; sodium bentonite 6%. The weighed dolomite powder, fly ash, mineral powder and bentonite are uniformly mixed in a mixer to obtain the modified dolomite powder-based mineral admixture DI.

Embodiment 2

[0036] The percentage by weight of each component of a modified dolomite powder-based mineral admixture is: Blaine specific surface area is 397m 2 / kg of dolomite powder (CaCO 3 · MgCO 3 The mass percentage content is not less than 75%) 50%; 0.045mm square hole sieve is 10% Class I fly ash 20%; S95 grade slag powder 20%; sodium bentonite 10%. The weighed dolomite powder, fly ash, mineral powder and bentonite are uniformly mixed in a mixer to obtain the modified dolomite powder-based mineral admixture DII.

[0037] The modified dolomite powder-based mineral admixture DI and DII was used to prepare concrete, the mix ratio is shown in Table 1, and the performance of the concrete is shown in Table 2, Table 3, figure 1 with figure 2 shown

[0038] The raw materials for preparing concrete are: 42.5 ordinary Portland cement is used for cement, river sand with a fineness modulus of 2.6 is used for the admixture as described above, and river sand with a fineness modulus of 2.6 is ...

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Abstract

The invention discloses a modified dolomite powder based mineral admixture. The modified dolomite powder based mineral admixture is prepared by uniformly mixing the following raw materials in parts by weight: 50-60 parts of dolomite powder, 15-20 parts of mineral powder, 15-20 parts of fly ash and 5-10 parts of bentonite. Besides, the invention also discloses a preparation method of the admixture. According to the invention, the dolomite powder is used as the concrete mineral admixture, thereby obviously enhancing the working performance of cement concrete, improving water bleeding, ensuring the strength and durability, lowering the cost, and achieving remarkable economic and social benefits.

Description

technical field [0001] The invention belongs to the field of concrete, and in particular relates to a modified dolomite powder-based mineral admixture and a preparation method. Background technique [0002] At present, with the rapid development of concrete engineering in my country, the demand for mineral admixtures has increased sharply. Due to the constraints of geography and resource distribution, commonly used mineral admixtures such as fly ash and mineral powder are increasingly in short supply. Waste stone powder for processing has the advantages of wide sources and low price. For example, its use as a concrete mineral admixture meets the requirements of the country's green concrete, and has huge social and economic benefits. [0003] Dolomite is a mineral resource with relatively abundant reserves in my country. The annual mining volume of dolomite exceeds 10 million tons. Using the waste dolomite powder produced in the mining process as a concrete mineral admixture i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B18/12
CPCC04B28/04C04B40/0039C04B14/26C04B18/08C04B18/12C04B14/104C04B14/02C04B14/068C04B2103/302Y02W30/91
Inventor 肖佳郭明磊吴婷田承宇徐勇
Owner CENT SOUTH UNIV
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