Ultrahigh-performance concrete containing basalt coarse aggregate and preparation method of same

A technology of ultra-high performance and coarse aggregate, applied in the field of building materials, can solve the problems of serious autogenous shrinkage, harsh curing conditions, and high production cost of ultra-high performance concrete, and achieve reduced negative impact on mechanical properties and good durability , Inhibit the effect of self-shrinkage

Inactive Publication Date: 2017-07-14
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of high production cost of ultra-high performance concrete, serious self-shrinkage phenomenon, and harsh curing conditions, the present invention designs an ultra-high performance concrete containing basalt coarse aggregate and its preparation method

Method used

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  • Ultrahigh-performance concrete containing basalt coarse aggregate and preparation method of same
  • Ultrahigh-performance concrete containing basalt coarse aggregate and preparation method of same
  • Ultrahigh-performance concrete containing basalt coarse aggregate and preparation method of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The present invention has prepared a kind of super high-performance concrete containing basalt coarse aggregate, and its raw material mixing ratio (according to 1m 3 The amount of concrete material) and performance are as follows:

[0031] The cement is P·Ⅱ52.5 ordinary Portland cement with a specific surface area of ​​400m 2 / kg, 28d compressive strength 58MPa; silica fume: SiO 2 The content is greater than 95%, and the specific surface area is 20000m 2 / kg, the density is 625kg / m 3 ; Fly ash: Class I fly ash, the loss on ignition is not more than 2%, and the density is 2.0g / cm 3 .

[0032] Fine aggregate: quartz sand, SiO 2 Content > 99%, medium sand in Zone II, mud content less than 0.5%, density 2.63g / cm 3 .

[0033] Coarse aggregate: it is basalt, which is uniformly mixed with particle sizes of 5~10mm and 10~20mm according to the mass ratio of 3:7, and the apparent density is 2.82g / cm 3 , The crushing index does not exceed 5%, the mud content is 0%, and the...

Embodiment 2

[0051] The ultra-high performance concrete containing basalt coarse aggregate prepared by this implementation example, the raw material mix ratio (1m 3 The dosage of each raw material of ultra-high performance concrete) is shown in Table 2:

[0052] Table 2 Mix design of ultra-high performance concrete containing basalt coarse aggregate (kg / m 3 )

[0053]

[0054] Raw material requirements and preparation method are the same as in Example 1.

Embodiment 3

[0056] The ultra-high performance concrete containing basalt coarse aggregate prepared by this implementation example, the raw material mix ratio (1m 3 The dosage of each raw material of ultra-high performance concrete) is shown in Table 3:

[0057] Table 3 Mix design of ultra-high performance concrete containing basalt coarse aggregate (kg / m 3 )

[0058]

[0059] Raw material requirements and preparation method are the same as in Example 1.

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Abstract

The invention provides ultrahigh-performance concrete containing basalt coarse aggregate and a preparation method thereof. The concrete includes a cementing material, an aggregate, water, a polycarboxylate high-effective water reducer, and steel fibers. The concrete is prepared by mixing the raw materials in specific sequence and performing nature maintenance. In the invention, basalt gravel, as a coarse aggregate, is blended with the ultrahigh-performance concrete, so that shrinkage of the ultrahigh-performance concrete is effectively inhibited; when reduction range of strength is small, production cost of the ultrahigh-performance concrete is greatly reduced. In addition, the maintenance method is simple, so that the preparation method has convenience in practical engineering application.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to ultra-high performance concrete containing basalt coarse aggregate and a preparation method thereof. Background technique [0002] Compared with ordinary concrete, Ultra High Performance Concrete (UHPC) has higher bearing capacity and better durability under the same cross-section due to its ultra-high strength, high workability and high durability. It can reduce the cross-sectional size of structural components, reduce the weight of the structure itself, increase the space of the building, and make the building develop towards high-rise, light weight, large-span and high durability. This is also the future of building structures. direction of development. In addition to the above three excellent properties, UHPC also has excellent anti-seepage, anti-explosion, and impact-resistance properties, and can be used in buildings with strict requirements for anti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B14/14C04B20/00
CPCC04B28/04C04B14/14C04B20/0076C04B2201/50C04B18/146C04B18/08C04B14/06C04B24/24C04B14/48C04B22/002
Inventor 徐礼华吴方红池寅余敏卢秋如程鹏
Owner WUHAN UNIV
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