Mineral admixture core material for precast concrete

A technology of mineral admixtures and prefabricated components, applied in the field of concrete, can solve the problems of untargeted product and component design, low slump, high early strength and high durability, etc., to improve comprehensive performance and high strength Effect

Active Publication Date: 2020-03-24
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Most of the above-mentioned existing technologies are mineral admixtures dedicated to high-performance concrete for a specific project. The component design has not deviated from the design of traditional admixture components. There is no targeted product and component design yet. This patented design starts with the introduction of new cement mineral phases, pays attention to the unity of high strength, high impermeability and durability of concrete, and adjusts it through multi-component compounding of small materials Working state of precast concrete

Method used

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  • Mineral admixture core material for precast concrete
  • Mineral admixture core material for precast concrete

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Embodiment 2

[0040] A kind of mineral admixture core material for prefabricated component concrete, its raw material formula comprises the following components by weight percentage:

[0041]The composition is CaO: 60wt%, Al 2 o 3 : 25wt%, Fe 2 o 3 : 15wt% high-iron calcium aluminate cement: 34.4%;

[0042] Specific surface area 857m 2 / kg ultrafine mineral powder: 18%;

[0043] Ferrous sulfate: 20%;

[0044] Coupling agent active coated lightweight hollow microspheres (D(90)=3.5μm, bulk density=476kg / m 3 ): 7.6%;

[0045] Anhydrite whiskers with an average diameter of 3-4 μm and an average length of 50-80 μm: 8.3%;

[0046] Basalt fiber with a single filament diameter of 10-15 μm and an average length of 12-16 μm: 9.0%;

[0047] Melamine superplasticizer powder: 0.7%;

[0048] Magnesium Stearate: 2.0%.

Embodiment 3

[0050] A kind of mineral admixture core material for prefabricated component concrete, its raw material formula comprises the following components by weight percentage:

[0051] The composition is CaO: 62wt%, Al 2 o 3 : 23wt%, Fe 2 o 3 : 15wt% high iron calcium aluminate cement: 28.9%;

[0052] Specific surface area 912m 2 / kg ultrafine mineral powder: 25%;

[0053] Zinc sulfate: 20%;

[0054] Coupling agent active coated lightweight hollow microspheres (D(90)=4.5μm, bulk density=420kg / m 3 ): 5%;

[0055] Gypsum whiskers: dihydrate gypsum whiskers with an average diameter of 3-4 μm and an average length of 50-80 μm: 10%;

[0056] Inorganic fibers: carbon fibers with a single filament diameter of 10-15 μm and an average length of 12-16 μm: 8.0%;

[0057] Melamine superplasticizer powder: 2.0%;

[0058] Zinc stearate: 1.1%.

Embodiment 4

[0060] A kind of mineral admixture core material for prefabricated component concrete, its raw material formula comprises the following components by weight percentage:

[0061] The composition is CaO: 64wt%, Al 2 o 3 : 23wt%, Fe 2 o 3 : 13wt% high-iron calcium aluminate cement: 39.5%;

[0062] Specific surface area 863m 2 / kg ultrafine mineral powder: 19%;

[0063] Magnesium sulfate: 18%;

[0064] Coupling agent active coated lightweight hollow microspheres (D(90) = 2μm, bulk density = 492kg / m 3 ): 8.9%;

[0065] Hemihydrate gypsum whiskers with an average diameter of 3-4 μm and an average length of 50-80 μm: 7.1%;

[0066] Basalt fiber with a single filament diameter of 10-15 μm and an average length of 12-16 μm: 5%;

[0067] Melamine superplasticizer powder: 1.5%;

[0068] Aluminum stearate: 1%.

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Abstract

The invention belongs to the technical field of building materials, and particularly relates to a core material for a mineral admixture used for prefabricated concrete. The core material is prepared from, by weight, 20-40% of high-iron calcium aluminate cement, 10-20% of metal sulfates, 10-25% of superfine mineral powder, 5-10% of hollow microspheres, 7-15% of gypsum whiskers, 5-10% of inorganic fibers, 1-2% of lubricating agent and 0.5-2.0% of dry melamine water reducing agent powder, wherein the total mass is 100. Due to the cooperative effect of the high-iron calcium aluminate cement and the metal sulfates, the 1-day strength and the 28-day strength of the prefabricated concrete are improved; due to the cooperative effect of the superfine mineral powder, the gypsum whiskers and the inorganic fibers, the flexural strength and the later strength are improved; due to the cooperative effect of the hollow microspheres, the lubricating agent and the melamine water reducing agent powder, the low-slump flowability of the prefabricated concrete is ensured.

Description

technical field [0001] The invention belongs to the field of concrete, and in particular relates to a core material of a special mineral admixture for prefabricated concrete and a technology for controlling the quality of the admixture. Background technique [0002] Mineral admixtures have become one of the necessary raw materials for concrete, mainly including: fly ash, mineral powder and silica fume, fly ash, mineral powder double blending or fly ash, mineral powder and silica fume double blending technology, has also been It is an inevitable trend in the development of mineral admixtures. Composite admixture technology can not only improve the workability of concrete, but also ensure high strength, chloride ion resistance Erosion, high density and high durability. [0003] Because admixtures can completely replace cement in some aspects, and the cost is relatively low, it can create high economic profits for construction companies; in actual operation, it is easy to use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/02
CPCC04B18/021C04B18/141C04B22/148C04B18/08C04B14/383C04B14/42C04B24/129C04B24/085C04B22/142C04B14/46C04B14/386
Inventor 柯凯文帅涛王迎斌谌援
Owner HUBEI UNIV OF TECH
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