Autoclave curing-free, light and ultrahigh-strength concrete and preparation method thereof

An ultra-high-strength concrete and steam-free technology, which is applied in the field of building materials, can solve the problems of prefabricated components such as size and weight, large shrinkage, and blockage of existing roads, so as to achieve excellent work performance and durability, improve durability, and improve The effect of flow properties

Active Publication Date: 2019-12-13
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the construction adopts the traditional concrete pouring on site construction method, not only the construction period is long (3-5 years), but also the phenomenon of occupying land and blocking existing roads is very serious
Changing the traditional construction method of bridges and adopting prefabricated and assembled rapid construction methods is the development trend of urban bridge construction technology. However, the ordinary high-performance concrete currently used has high density and low strength. The development and application of prefabricated assembly construction technology
Compared with ordinary high-performance concrete, ultra-high-performance concrete (UHPC) has higher mechanical properties and durability. It is applied to prefabricated bridge structures, which can reduce the cross-sectional size of the bridge, reduce the amount of steel bars, and reduce the structural weight. High density (2600-2800kg / m 3 ), large shrinkage under non-steaming conditions (365d shrinkage up to 800×10 -6 ), long volume stability time, high energy consumption required for steam curing, complex construction technology and other technical problems

Method used

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  • Autoclave curing-free, light and ultrahigh-strength concrete and preparation method thereof
  • Autoclave curing-free, light and ultrahigh-strength concrete and preparation method thereof
  • Autoclave curing-free, light and ultrahigh-strength concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] A preparation method of high-strength porous microspheres, the specific steps are:

[0071] 1) Coal gangue powder, soft kaolin powder, dolomite powder and limestone powder are mixed uniformly in a mixer in a mass ratio of 75:10:12:3;

[0072] 2) Add water with 30% of the total mass of the powder, and stir with the evenly mixed powder in a planetary mixer for 200 seconds, then let it stand for 2 hours to obtain a mud base for firing high-strength porous microspheres;

[0073] 3) Put the obtained mud base into a ball forming machine to prepare a continuously graded spherical plastic mud mass of 4.75mm to 9.5mm, and place it at room temperature for 8 hours;

[0074] 4) Calcining the plastic mud mass in step 3), the calcination system is: heat up to 110°C at a heating rate of 5°C / min for pre-calcination, and keep it warm for 20 minutes; continue to heat up to 900°C at a heating rate of 5°C / min ℃ for calcination, and keep it warm for 15 minutes; then increase the temperature ...

Embodiment 2

[0076] A preparation method of interface modified emulsion A, the concrete steps are:

[0077] 1) Dissolve sodium hydroxide in deionized water, heat to 60°C, add emulsifier alkylphenol polyoxyethylene polyoxypropylene ether and dissolve evenly to obtain mixed solution I;

[0078] 2) heating and melting palmitic acid at 60° C. to obtain palmitic acid liquid;

[0079] 3) Slowly add the mixed solution I into the palmitic acid liquid, carry out saponification reaction at 80° C., and stir for 30 minutes;

[0080] 4) Cool the soap liquid obtained in step 3) to 25°C, slowly add ammonia water under stirring until the ammonia water is added, and a uniform emulsion is obtained;

[0081] 5) Slowly add 200-mesh natural zeolite powder into the emulsion prepared in step 4), and stir until the zeolite powder is evenly dispersed to obtain an interface-improving emulsion A agent.

[0082] Among them, the mass ratio of palmitic acid, ammonia water, sodium hydroxide, deionized water, 200 mesh ...

Embodiment 3

[0084] A preparation method of interface modified emulsion B, the concrete steps are:

[0085] 1) Add polyvinyl alcohol with a degree of alcoholysis of 80% to 1 / 2 mass of deionized water, heat and dissolve in a water bath at 80°C to obtain a polyvinyl alcohol solution;

[0086] 2) Slowly pour xanthan gum into the polyvinyl alcohol solution obtained in step 1), and then add the remaining deionized water and stir to obtain the interface-improving emulsion B agent.

[0087] The mass ratio of polyvinyl alcohol, deionized water, and xanthan gum having an alcoholysis degree of 80% is 22:75:1.

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Abstract

Belonging to the field of building materials, the invention particularly relates to an autoclave curing-free, light and ultrahigh-strength concrete and a preparation method thereof. The concrete is composed of a cementing material, interface-modified high-strength porous microspheres, natural sand, a super absorbent slow-release internal curing material, a hyper-dispersion reducing admixture and water. Based on the particle close packing theory, the method provided by the invention adopts silica fume, fly ash microspheres and ultrafine limestone powder, designs and optimizes the cementing material particle composition, fires high-strength porous microspheres, researches and develops an interface improvement emulsion, and performs treatment on the surfaces of porous microspheres to obtain the interface-modified high-strength porous microspheres, and then optimizes the concrete interfacial transition zone; and the super absorbent slow-release internal curing material is prepared, and significantly lowers the early autogenous shrinkage of concrete. The prepared concrete has the characteristics of high strength, light weight, small shrinkage and the like, can obviously reduce the self-weight of the structure, and provides a new material choice for structural design and construction innovation.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to steam-free, lightweight, ultra-high-strength concrete and a preparation method thereof. Background technique [0002] With the continuous expansion of city scope and construction scale, the problem of traffic congestion has become increasingly prominent. Construction of urban viaducts and overpasses is a major measure to alleviate traffic congestion. At present, most of the construction adopts the traditional concrete pouring on site construction method, not only the construction period is long (3-5 years), but also the phenomenon of occupying land and blocking existing roads is very serious. Changing the traditional construction method of bridges and adopting prefabricated and assembled rapid construction methods is the development trend of urban bridge construction technology. However, the ordinary high-performance concrete currently used has high density and low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B38/08C04B20/02C04B38/00C04B111/40
CPCC04B20/023C04B28/04C04B38/0025C04B38/08C04B2111/00017C04B2111/40C04B2201/50C04B18/082C04B18/146C04B14/28C04B14/06C04B2103/302C04B18/027C04B24/168C04B24/10C04B33/132
Inventor 刘凯王军赵日煦张恒春黄汉洋谯理格包明陈晓润
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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