Full-scale fiber toughened ultra-high performance concrete and preparation method thereof

An ultra-high performance, fiber toughening technology, applied in the field of building materials, can solve the problem that ordinary mixers are difficult to form, and achieve the effect of maintaining volume stability

Inactive Publication Date: 2020-10-20
CHINA WEST CONSTR ACAD OF BUILDING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the toughness improvement of ultra-high performance concrete is mainly to increase its flexural strength and tensile strength by adding steel fibers. The content of steel fibers is generally 1.0% to 5.0% by volume, and the content of steel fibers exceeds 3.0%. After ordinary blender will be difficult to shape

Method used

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  • Full-scale fiber toughened ultra-high performance concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A full-scale fiber-toughened ultra-high-performance concrete, including the following components by weight: 160 parts of steel fiber, 10 parts of basalt fiber, 20 parts of calcium carbonate whisker, 0.8 part of carbon nanotube, ordinary 52.5R portland cement 690 parts, 212 parts of mineral powder, 160 parts of silica fume, 1060 parts of river sand, 9 parts of admixture, and 170 parts of water.

[0028] and prepared by the following steps:

[0029] (1) Vibrating, stirring and dispersing cement, mineral powder, silica fume and river sand to obtain ultra-high performance concrete dry powder with good homogeneity;

[0030] (2) The carbon nanotubes and calcium carbonate whiskers are dispersed in the admixture by means of ultrasonic dispersion;

[0031] (3) Pour the above-mentioned ultra-high-performance concrete dry powder into an ordinary forced mixer, add weighed water and an admixture in which carbon nanotubes are dispersed, and stir for 3 to 5 minutes to obtain a slurry...

Embodiment 2

[0037] A full-scale fiber-toughened ultra-high performance concrete, including the following components by weight: 200 parts of steel fibers, 10 parts of calcium carbonate whiskers, 1.0 parts of carbon nanotubes, 690 parts of ordinary 52.5R Portland cement, mineral powder 212 parts, 160 parts of silica fume, 1060 parts of river sand, 9 parts of admixture, 180 parts of water.

[0038] After mixing, the concrete compressive strength test piece of 100mm×100mm×100mm and the concrete flexural strength test piece of 100mm×100mm×400mm are formed according to the standard T / CCPA 7-2018 "Basic Properties and Test Methods of Ultra-high Performance Concrete". After the slurry is hardened, remove the mold and place it in a standard curing room for curing. The performance test results are shown in Table 1.

Embodiment 3

[0040] A full-scale fiber-toughened ultra-high-performance concrete, including the following components by weight: 120 parts of steel fibers, 20 parts of basalt fibers, 20 parts of calcium carbonate whiskers, 1.2 parts of carbon nanotubes, and ordinary 42.5R portland cement 690 parts, 212 parts of mineral powder, 160 parts of silica fume, 1060 parts of machine-made sand, 9 parts of admixture, and 170 parts of water.

[0041] After mixing, the concrete compressive strength test piece of 100mm×100mm×100mm and the concrete flexural strength test piece of 100mm×100mm×400mm are formed according to the standard T / CCPA 7-2018 "Basic Properties and Test Methods of Ultra-high Performance Concrete". After the slurry is hardened, remove the mold and place it in a standard curing room for curing. The performance test results are shown in Table 1.

[0042] Table 1

[0043]

[0044]In Table 1, comparative example 1 is ultra-high performance concrete with conventional steel fibers added,...

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Abstract

The invention discloses a full-scale fiber toughened ultra-high performance concrete and a preparation method thereof. Fibers, which are used in the ultra-high performance concrete and are used for toughening the ultra-high performance concrete, are divided into millimeter-scale fibers, micron-scale fibers and nano-scale fibers in a full-scale range. Fibers with three scales are matched based on the stress characteristics of the ultra-high performance concrete so as to meet different requirements on mechanical properties. The concrete comprises the following components in parts by weight: 90 to 250 parts of full-scale fibers, 600 to 900 parts of cement, 100 to 300 parts of mineral powder, 100 to 200 parts of silica fume, 900 to 1200 parts of fine aggregate, 8 to 15 parts of additive and 160 to 190 parts of water. The ultra-high performance concrete is toughened by full-scale fibers in the millimeter, micrometer, and nanometer scales, and thus the cracks in different scales can be constrained and controlled, when a force is applied on the ultra-high performance concrete.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a full-scale fiber toughened ultra-high performance concrete and a preparation method thereof. Background technique [0002] Ultra-high performance concrete is a new type of cement-based material characterized by ultra-high strength, ultra-high toughness, and ultra-high durability. The design, preparation, microstructure, performance and construction of ultra-high performance concrete materials and structures have become the most advanced and cutting-edge research directions in the field of construction engineering. These advantages of ultra-high-performance concrete leave a very large development space and very large application advantages in infrastructure construction in the fields of traffic roads and bridges, energy engineering, etc. [0003] The design theory of ultra-high performance concrete mainly relies on the closest packing theory (DSP). The cl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B14/48C04B14/46C04B14/38
CPCC04B28/04C04B2201/50C04B2201/52C04B14/48C04B14/4656C04B14/383C04B14/026C04B18/141C04B18/146C04B14/068C04B2103/302C04B14/06
Inventor 杨文罗遥凌谢昱昊王军毕耀高育欣闫欣宜
Owner CHINA WEST CONSTR ACAD OF BUILDING MATERIALS CO LTD
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