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Bendable concrete and preparation method thereof

A concrete and bending technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of easy aging, easy corrosion and expansion, rapid deterioration of concrete mechanical properties and long-term durability, and achieve anti-aging. Performance enhancement, flexural properties and excellent durability

Active Publication Date: 2021-12-07
昭通市宜昭高速公路投资开发有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the phenomenon that steel bars and steel fibers are easy to corrode and expand under the conditions of salt corrosion and electric current corrosion, and organic synthetic fibers are easy to age under the conditions of high temperature difference and strong ultraviolet light, etc., which lead to the rapid deterioration of the mechanical properties and long-term durability of concrete in harsh environments, and the service time is short Problem, the present invention provides a bendable concrete that not only has the mechanical properties of steel fiber / organic synthetic fiber reinforced concrete, but also has excellent corrosion resistance, aging resistance and high temperature resistance

Method used

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  • Bendable concrete and preparation method thereof
  • Bendable concrete and preparation method thereof
  • Bendable concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The material composition ratio is shown in Table 1:

[0045] Table 1 Mixing ratio of bendable concrete materials (mass parts)

[0046]

[0047] The cement is P·O 42.5 ordinary Portland cement; the nominal maximum particle size of basalt machine-made sand is 1.25mm, and the fineness modulus is 2.3; 608; The water reducing agent is a polycarboxylate high-performance water reducing agent, and the water reducing rate is 25%;

[0048] The functional fibers are basalt fibers impregnated with a mixed solution of silane coupling agent and calcium carbonate whiskers, and then dried. Specifically, strong magnetic stirring (stirring speed: 1000r / min) and ultrasonic vibration dispersion (working frequency 20~ 25KHz, ultrasonic power 300W), first disperse the calcium carbonate whiskers into the silane coupling agent solution at 40°C, and then add the basalt fiber to the mixed solution of silane coupling agent and calcium carbonate whiskers;

[0049] The equivalent diameter of b...

Embodiment 2

[0053] The material composition ratio is shown in Table 2:

[0054] Table 2 Proportions of bendable concrete materials (mass parts)

[0055]

[0056] The cement is P·II 42.5 Portland cement; the fly ash is F class I fly ash; the nominal maximum particle size of basalt machine-made sand is 1.25mm, and the fineness modulus is 1.0; It is tap water for drinking; the silane coupling agent is KH-792; the water reducing agent is polycarboxylate high-performance water reducing agent, and the water reducing rate is 26%;

[0057] The functional fibers are basalt fibers impregnated with a mixed solution of silane coupling agent and calcium carbonate whiskers and then dried. Specifically: first, stir with strong magnetic force (stirring speed: 800r / min) and disperse with ultrasonic vibration (working frequency 20 ~ 25KHz, ultrasonic power 500W), the calcium carbonate whiskers are first dispersed in the silane coupling agent solution at 60°C, and then the basalt fibers are added to the...

Embodiment 3

[0061] The material composition ratio is shown in Table 3:

[0062] Table 3 Proportions of bendable concrete materials (mass parts)

[0063]

[0064] The cement is P·I 42.5 Portland cement; the fly ash is Class F Class II fly ash; the slag is S75 class slag; the nominal maximum particle size of basalt machine-made sand is 1.25mm, and the fineness modulus is 1.4; basalt superfine stone powder is 45μm The sieve residue is zero; the water is drinking tap water; the silane coupling agent is KH-892; the water reducing agent is polycarboxylate high-performance water reducing agent, and the water reducing rate is 26%;

[0065] The functional fibers are basalt fibers impregnated with a mixture of silane coupling agent and calcium carbonate whiskers and then dried. Disperse into silane coupling agent solution at 50°C, then add basalt fiber to the mixed solution of silane coupling agent and calcium carbonate whisker for impregnation;

[0066] The equivalent diameter of basalt fiber...

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Abstract

The invention discloses bendable concrete and a preparation process thereof. The bendable concrete is prepared from the following components in parts by mass: 10 to 60 parts of cement, 0 to 50 parts of mineral admixture, 15 to 25 parts of aggregate, 0.1 to 0.5 part of stone powder, 15 to 25 parts of water, 0.25 to 1 part of chemical admixture and 0.5 to 4.5 parts of functional fiber. The basalt fiber adopted by the invention belongs to an inorganic non-metallic material, is corrosion-resistant, non-conductive and anti-aging, has the same thermal expansion coefficient as a basalt superfine stone powder and the basalt aggregate of the matrix, and is coordinated and consistent in thermal deformation, so that the volume stability is remarkably improved; and the viscosity is adjusted by adopting the basalt superfine stone powder, a viscosity adjusting additive is not needed, and the dosage of a chemical additive and a rubber material is reduced. The bendable concrete disclosed by the invention can be applied to engineering structure parts and the like with requirements on corrosion resistance, aging resistance and large deformation.

Description

technical field [0001] The invention belongs to the technical field of traffic engineering materials, and in particular relates to a bendable concrete and a preparation process thereof. Background technique [0002] As the largest building material, concrete has excellent compression resistance, but it is easy to be brittle under bending loads. The bending-compression ratio of ordinary concrete is between 1 / 12 and 1 / 8. In order to solve the poor bending resistance of concrete, engineering structures adopt the preparation of bending steel bars or adding fibers to increase the bending resistance of concrete structures. However, under harsh service conditions such as marine environment, salt lake environment, and stray currents, steel bars or steel fibers are prone to corrosion and expansion, and are easy to conduct electricity, resulting in deterioration of concrete structures; under the conditions of strong ultraviolet rays and high temperature differences on plateaus, organi...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B111/20C04B111/92
CPCC04B28/04C04B2111/2015C04B2201/50C04B2111/92C04B14/14C04B2103/302C04B14/383C04B14/4643C04B18/08C04B18/141Y02W30/91
Inventor 杜杰贵陈波白银罗秋伦王正星陆亚东白兴金张丰吕乐乐宁逢伟
Owner 昭通市宜昭高速公路投资开发有限公司
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