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SAP-based machine-made sand ultra-high performance concrete and preparation method and application thereof

An ultra-high-performance, machine-made sand technology, applied in the field of building materials, to achieve the effect of improving the pumping performance of ultra-high-rise buildings, good durability and low density

Pending Publication Date: 2020-04-03
ANHUI UNIVERSITY OF ARCHITECTURE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of extremely low water-binder ratio of machine-made sand ultra-high performance concrete and large drying shrinkage in the later stage, the present invention provides a machine-made sand ultra-high performance concrete based on SAP and its preparation method and application, with the purpose of solving the problems in the prior art Part of the problem or at least alleviate some of the problems in the prior art

Method used

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  • SAP-based machine-made sand ultra-high performance concrete and preparation method and application thereof
  • SAP-based machine-made sand ultra-high performance concrete and preparation method and application thereof
  • SAP-based machine-made sand ultra-high performance concrete and preparation method and application thereof

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Effect test

Embodiment 1

[0034] The machine-made sand ultra-high performance concrete without adding SAP and expansion agent includes the following components in parts by weight: 21 parts of cement; 4.6 parts of fly ash; 3.4 parts of silica fume; 28 parts of machine-made sand; 42 parts of gravel; parts; the water-binder ratio is 0.18. Among them, the cement used is Portland cement with P II 52.5; silica fume is produced by Chengdu Mingling Technology Co., Ltd., and its SiO 2 The content is 93%, the specific surface area is 21500m 2 / kg, moisture content 0.5%, water demand ratio 125%, loss on ignition 3.7%; use fly ash beads produced by Tianjin Zhucheng New Material Technology Co., Ltd.; machine-made sand: apparent density 2670kg / m 3 , packing density, 1560kg / m 3 , Contain mud / stone powder (3 , Crushing value 6.2%.

[0035] Its preparation method is as follows:

[0036] S1: Pour the cement, silica fume, fly ash microbeads, machine-made sand, and gravel weighed according to the weight components sta...

Embodiment 2

[0040] The machine-made sand ultra-high performance concrete without adding SAP but adding expansion agent includes the following components in parts by weight: 21 parts of cement; 4.6 parts of fly ash; 3.4 parts of silica fume; 28 parts of machine-made sand; 42 parts of crushed stone; parts; 0.5 parts of water reducing agent; water-binder ratio is 0.18. Among them, the cement used is Portland cement with P II 52.5; silica fume is produced by Chengdu Mingling Technology Co., Ltd., and its SiO 2 The content is 93%, the specific surface area is 21500m 2 / kg, moisture content 0.5%, water demand ratio 125%, loss on ignition 3.7%; use fly ash beads produced by Tianjin Zhucheng New Material Technology Co., Ltd.; machine-made sand: apparent density 2670kg / m 3 , packing density, 1560kg / m 3 , mud / stone powder content (3 , crushing value 6.2%; expansion agent is Subote composite expansion agent, which is prepared by compounding calcium sulfoaluminate-calcium oxide double expansion sourc...

Embodiment 3

[0046] The machine-made sand ultra-high performance concrete mixed with SAP without expansion agent includes the following components in parts by weight: 21 parts of cement; 4.6 parts of fly ash; 3.4 parts of silica fume; 28 parts of machine-made sand; 42 parts of gravel; Resin (SAP) 0.08 parts; water reducer 0.5 parts; water-binder ratio 0.18. Among them, the cement used is Portland cement with P II 52.5; silica fume is produced by Chengdu Mingling Technology Co., Ltd., and its SiO 2 The content is 93%, the specific surface area is 21500m 2 / kg, moisture content 0.5%, water demand ratio 125%, loss on ignition 3.7%; use fly ash beads produced by Tianjin Zhucheng New Material Technology Co., Ltd.; machine-made sand: apparent density 2670kg / m 3 , packing density, 1560kg / m 3 , mud / stone powder content (3 , Crushing value 6.2%. SAP selects polyacrylic acid sodium salt resin produced by a company in Tianjin. The particles are spherical and the particle size ranges from 75-125 μm...

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Abstract

The invention belongs to the technical field of building materials, and particularly relates to SAP-based machine-made sand ultra-high performance concrete and a preparation method and application thereof. According to the invention, SAP and an expanding agent are co-doped, the self-shrinkage of the machine-made sand ultra-high performance concrete is compensated by utilizing the internal curing of the SAP and the characteristic that water released by the SAP can be utilized by the expanding agent, and the problem of water competition between the expanding agent and cement is solved. The ultra-high performance concrete provided by the invention has the characteristics of excellent working performance, relatively low apparent density, ultra-high strength, low shrinkage, relatively good durability and the like. The preparation process is simple, the problem of poor concrete workability caused by sharp machine-made sand particles can be solved, the problems of large additive adsorption capacity, difficult concrete pumping, large shrinkage cracking risk and the like caused by high stone powder content of machine-made sand are solved, the super high-rise concrete pumping performance canbe improved, the problems of large viscosity, large volume shrinkage and the like, caused by low water-binder ratio and high cementing material consumption, of an ultra-high-performance concrete mixture are solved, and the practical popularization value is achieved.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a SAP-based machine-made sand ultra-high performance concrete and its preparation method and application. Background technique [0002] As the current construction industry continues to develop towards high-rise, super high-rise, and long-span structures, the development of modern concrete will continue to move closer to high strength, high workability, light weight, high durability, and energy saving. In particular, the development and application of high-performance admixtures have greatly improved the working performance of concrete, enabling high-strength concrete with low water-to-binder ratio to meet the pumping requirements of super high-rise and long-span pumping, and promoting super-large, super-high, super-high Long building development. However, ordinary concrete with a strength lower than C60 is difficult to meet the needs of modern super high-rise (above ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B38/00C04B111/20C04B111/40C04B111/76
CPCC04B28/04C04B38/00C04B2111/20C04B2111/40C04B2111/76C04B2201/50C04B18/08C04B18/146C04B14/06C04B14/02C04B24/24C04B2103/302C04B22/142C04B22/064C04B22/066C04B22/143
Inventor 张高展侯东帅杨军丁庆军魏琦葛竞成王宇
Owner ANHUI UNIVERSITY OF ARCHITECTURE
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