Self-compacting UHPC containing microbeads, and preparation method thereof

A self-compacting, micro-bead technology, applied in the field of concrete preparation, can solve the problems of poor durability, ultra-high-performance concrete viscosity, difficult self-compacting concrete performance, etc., to improve mechanical properties and durability, good water-reducing ability, and improve The effect of work performance

Inactive Publication Date: 2019-11-05
湖南恒盛瑞通新型建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems that ultra-high performance concrete is relatively viscous, difficult to mix evenly, and the existing self-compacting concrete has relatively low performance and poor durability. , concrete with high fluidity, high strength, excellent durability, not easy to crack, and its preparation method

Method used

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  • Self-compacting UHPC containing microbeads, and preparation method thereof
  • Self-compacting UHPC containing microbeads, and preparation method thereof
  • Self-compacting UHPC containing microbeads, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A kind of self-compacting UHPC containing microbeads and its component content are as shown in table 1, and preparation method comprises the following steps:

[0051] S1. Stir and mix cement, silica fume, metakaolin and microbeads for 1 to 2 minutes at a stirring speed of 48 to 100 rpm to obtain primary powder;

[0052] S2. Add sand to the primary powder obtained in S1, and stir while adding. The stirring time is 1 to 2 minutes, and the stirring speed is 48 to 100 rpm to obtain the secondary powder;

[0053] S3. Add all the water reducing agent and 75% water to the secondary powder in S2 while stirring, and stir while adding. The stirring speed is 30-60 rpm, the stirring time is 2 minutes, and the primary slurry is obtained by stirring evenly;

[0054] S4. Add the remaining water evenly to the primary slurry obtained in S3 and stir while adding, continue to stir for 2 to 3 minutes, then disperse and evenly add all the steel fibers to the primary slurry, and finally stir...

Embodiment 2～6

[0055] Examples 2-6: A preparation method containing microbeads is the same as Example 1, the only difference is that each component and its content are different, and the component content is shown in Table 1.

[0056] The component content table of table 1 embodiment 1-6 (unit: kg / m 3 )

[0057]

[0058] Performance Testing:

[0059] 1. Work performance test

[0060] The workability of fresh UHP concrete mixtures is expressed in Scalability (SF).

[0061] 1. Experimental method

Embodiment 1～6

[0062] Examples 1 to 6: The expansion test was carried out using the method in GB / T 50080-2016 "Standard for Test Methods of Performance of Ordinary Concrete Mixtures". The slump meter shall comply with the provisions of the current industry standard JG / T 248 "Concrete Slump Meter"; it shall be equipped with 2 steel rulers, the measuring range of the steel ruler shall not be less than 300mm, and the division value shall not be greater than 1mm; the bottom plate shall adopt The maximum deflection of a steel plate not less than 1500mm×1500mm in plane size and not less than 3mm in thickness shall not be greater than 3mm.

[0063] (1) The inner wall of the slump cylinder and the bottom plate should be moistened with no clear water; the bottom plate should be placed on a solid horizontal surface, and the slump tube should be placed in the center of the bottom plate, and then the pedals on both sides should be stepped on with the feet, and the slump The barrel should be kept in a fi...

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Abstract

The invention provides a self-compacting UHPC containing microbeads, and a preparation method thereof. The UHPC comprises, by weight, 500-790 parts of cement, 245 parts of silica fume, 205 parts of metakaolin, 100-255 parts of the microbeads, 980 parts of sands, 180 parts of steel fibers, 30-35 parts of a water reducer and 238.5 parts of water. The preparation method comprises the following steps:the cement, silica fume, metakaolin and microbeads are taken, and are stirred and mixed to obtain a primary powder; the sands are added to the primary powder, and stirring is performed to reach uniformity in order to obtain a secondary powder; the water reducer is uniformly mixed with 75% of the water, the obtained solution is added to the secondary powder, and stirring is performed to reach uniformity in order to obtain a primary slurry; the remaining water is added to the primary slurry, stirring is performed, the steel fibers are added, and stirring is performed to reach uniformity in order to obtain a mortar; and the mortar is added into a mold, undergoes forming curing, and is demolded to obtain the self-compacting UHPC containing microbeads. The obtained UHPC has the advantages of high strength, good mechanical properties and good durability.

Description

technical field [0001] The invention relates to the technical field of concrete preparation, in particular to a self-compacting UHPC containing microbeads and a preparation method thereof. Background technique [0002] Ultra-high performance concrete (UHPC for short) refers to a fiber-reinforced cement-based composite material with ultra-high impermeability and mechanical properties, that is, the chloride ion diffusion coefficient should not be greater than 20×10 -14 m 2 / s (UD20 grade), the tensile strength is not less than 5MPa (UT05 grade) and the residual tensile strength is not less than 3.5MPa when the tensile deformation reaches 0.15%, and the compressive strength is not less than 120MPa (UC120 grade). [0003] Chinese patent CN108609974A proposes a preparation method of ultra-high performance concrete, wherein the powder material of UHPC includes the following components: Portland cement 40-50 parts, sulphoaluminate rapid hardening cement 20-30 parts, silica fume 5 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
CPCC04B28/00C04B2201/50C04B18/146C04B14/106C04B14/041C04B14/06C04B14/48C04B2103/302
Inventor 李胤李长双
Owner 湖南恒盛瑞通新型建材有限公司
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