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Autoclaving-free light ultra-high-performance concrete and preparation method thereof

An ultra-high performance, concrete technology, applied in the field of building materials, can solve the problems of the size and self-weight of prefabricated bridge components, difficult transportation and hoisting, low apparent density, etc. The effect of apparent density

Active Publication Date: 2019-07-26
ANHUI UNIVERSITY OF ARCHITECTURE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a kind of non-steam curing lightweight ultra-high performance concrete and its preparation method. The ultra high performance concrete is exempted from high temperature steam curing or autoclaving curing, and has excellent working performance, low apparent density, Ultra-high strength and good volume stability, etc., which can solve the problems of prefabricated bridge component size and self-weight, transportation and hoisting difficulties in current urban traffic construction

Method used

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  • Autoclaving-free light ultra-high-performance concrete and preparation method thereof
  • Autoclaving-free light ultra-high-performance concrete and preparation method thereof
  • Autoclaving-free light ultra-high-performance concrete and preparation method thereof

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Embodiment 1

[0031] Example 1 Calculation of the cementitious material mix ratio according to the closest packing theory

[0032] According to the closest packing theory, the maximum packing density of cement-silica fume-fly ash ternary system is calculated by Aim-Goff model and its relative mass fraction is determined, and the maximum packing density is calculated according to Aim-Goff model. At this time, pozzolanic materials The maximum volume fraction Φ of p * It can be calculated with (1):

[0033]

[0034] ① among Φ p p * , the packing density Φ of the system can be calculated by formula (2):

[0035]

[0036] ② among Φ p >Φ p * , the packing density Φ of the system can be calculated by formula (3):

[0037]

[0038]In the formula: dp is the average particle size of pozzolanic particles; dc is the average particle size of cement particles; Φp is the volume fraction of pozzolanic materials; ε0 is the porosity of a single material. Finally, the bulk density of the cem...

Embodiment 2

[0039] Embodiment 2 Calculation of ceramsite gradation

[0040] Calculation principle of ceramsite gradation: The fineness and gradation of aggregate have a great influence on the porosity of concrete, so improving the gradation of aggregate particles can improve the mechanical properties of concrete. The aggregate gradation is calculated by the modified Andreasen&Andersen method, which considers the gradation of the largest and smallest particle sizes, and the expression is:

[0041]

[0042] In the formula: p' is the mass fraction of all aggregate particles with a particle size smaller than d; d min , d max are the smallest particle size and the largest particle size, q is the distribution modulus, the value is 0.23, the range of ceramsite particles is 0.15mm-2.00mm, and the particle sizes of five different particle sizes of shale ceramsite are 10-20 mesh , 20-40 mesh, 40-60 mesh, 60-80 mesh, 80-100 mesh. Through calculation, the mass ratio of shale ceramsite with five...

Embodiment 3

[0045] Steam-cured lightweight ultra-high performance concrete includes the following components by weight: 32 parts of cement; 8 parts of silica fume; 4 parts of fly ash sinking beads; 13 parts of steel fiber, 43 parts of pre-wet ceramsite, and 0.5 The cementitious materials are cement, silica fume, and fly ash, and the mass ratio between them is 1:0.25:0.125 based on the maximum bulk density; the water-binder ratio is 0.18. Among them, the cement used is ordinary Portland cement with P.O 52.5; the specific surface area of ​​silica fume used is 18000m 2 / kg, SiO 2 The content is 90%; the density of fly ash beads used is 2.5g / cm 3 , bulk density 0.7kg / m 3 The steel fiber used is copper-plated steel fiber, with a diameter of 0.22mm, a length of 13mm, and a compressive strength of 2850MPa; the ceramsite used is a mixture of five different particle sizes of shale ceramsite, and the bulk density is 800-1900kg / m 3 , the particle size range is 0.15mm~2.00mm, and the particle size...

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Abstract

The invention belongs to the technical field of building materials, and particularly relates to an autoclaving-free light ultra-high-performance concrete and a preparation method thereof. The ultra-high-performance concrete without high-temperature steam curing or autoclaved curing has the advantages of excellent working performance, low density, ultra-high strength, good volume stability and thelike, the durability of a concrete structure is improved, the problems of large size and dead weight and difficulty in transportation and hoisting of a prefabricated assembly bridge member in currenturban traffic construction can be solved, and the concrete has important practical application values. The preparation method and a construction technology are simple and easy in operation and have practical popularization values. Optimal gradation of the maximum compactness and ceramsites of a cement-silica fume-coal ash ternary system is achieved by the aid of a maximum stacking density theory,cement serves as a base material, silica fume serves as a densification component, coal ash serves as a modifier, the strength of the concrete is effectively improved by steel fibers, and micro-crackextension is delayed.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a non-steam curing lightweight ultra-high performance concrete and a preparation method thereof. Background technique [0002] With the continuous acceleration of my country's urbanization process, the city's scale and population have increased rapidly, which has brought enormous pressure to urban traffic. In order to alleviate urban traffic congestion, large and medium-sized cities are all speeding up the construction of rapid traffic passages such as urban viaducts and overpasses. [0003] At present, traditional concrete cast-in-place construction methods are mostly used in the construction of urban express traffic channels in my country. However, this method has a long construction period, great environmental pollution, and requires land occupation and encirclement, which is likely to cause traffic congestion. Therefore, it is an inevitable development trend of u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/40
CPCC04B28/04C04B2111/40C04B2201/20C04B2201/50C04B18/146C04B18/082C04B14/48C04B18/023C04B2103/302
Inventor 张高展魏琦丁庆军杨军葛竞成
Owner ANHUI UNIVERSITY OF ARCHITECTURE
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