Mixing proportion and preparation method of high-performance light-weight aggregate concrete

A lightweight aggregate concrete, high-performance technology, applied in the field of building materials, can solve the problem of fiber concrete staying in the ordinary concrete stage, etc., to reduce the adverse effect of compressive strength growth, increase the bonding force, and increase the bonding force. area effect

Inactive Publication Date: 2018-10-02
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, the research and application of fiber reinforced concrete is still at the stage of ordinary concrete.

Method used

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  • Mixing proportion and preparation method of high-performance light-weight aggregate concrete
  • Mixing proportion and preparation method of high-performance light-weight aggregate concrete
  • Mixing proportion and preparation method of high-performance light-weight aggregate concrete

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0073] Table 1 Mixing proportions of different fiber additions affecting the mechanical properties of lightweight aggregate concrete

[0074]

[0075] It can be seen from the above table that the addition of steel fiber and carbon fiber alone has little effect on the 3-day compressive strength of lightweight aggregate concrete, and the 28-day strength of fiber on 28-day light aggregate concrete has increased. With the growth of the period, the bonding strength between the matrix and the fiber increases, and the strengthening effect of the fiber is more obvious at 28 days than at 3 days. The incorporation of fibers can significantly increase the compression ratio of lightweight aggregate concrete, and can significantly increase the compression ratio of lightweight aggregate concrete. Under comprehensive comparison, it can be proved that the mixing ratio of adding 0.9% fiber given by the present invention is the optimal mixing ratio, and it has the most significant increase i...

example 2

[0076] Example 2: The high-strength lightweight aggregate concrete of LC40 is configured on the basis of the high-strength lightweight aggregate concrete mix ratio of LC40 provided in the present invention.

[0077]

[0078] The cement used is P.O 42.5 cement; the cementitious material is a composite cementitious material composed of cement, fly ash and silica fume; the fineness modulus of fine aggregate is greater than 2.56, and the apparent density is 2620kg / m 3 The natural medium sand; the coarse aggregate adopts 900-grade crushed stone shale lightweight aggregate ceramsite with 5-16mm continuous gradation, and the apparent density is 1512kg / m 3 ; The superplasticizer is BKS-199 polycarboxylate high-efficiency superplasticizer. The configuration method is as described in the present invention: put mineral admixture, fine aggregate and cement into the mixer, and stir for 30 seconds; add 40% water containing water reducing agent during the mixing process to form a wet mate...

example 3

[0081] Example 3: configure the high-strength lightweight aggregate concrete of LC50 based on the high-strength lightweight aggregate concrete mix ratio of LC50 provided in the present invention.

[0082]

[0083] The cement used is P.O42.5 cement; the cementitious material is a composite cementitious material composed of cement, fly ash and silica fume; the fine aggregate adopts a fineness modulus greater than 2.56 and an apparent density of 2620kg / m 3 The natural medium sand; the coarse aggregate adopts 900-grade crushed stone shale lightweight aggregate ceramsite with 5-16mm continuous gradation, and the apparent density is 1512kg / m 3 ; The superplasticizer is BKS-199 polycarboxylate high-efficiency superplasticizer. The configuration method is as described in the present invention: put mineral admixture, fine aggregate and cement into the mixer, and stir for 30 seconds; add 40% water containing water reducing agent during the mixing process to form a wet material; add p...

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Abstract

The invention relates to a mixing proportion and a preparation method of high-performance light-weight aggregate concrete. A cementing material for preparation of high-strength light-weight aggregateconcrete adopts a composite cementing material and is characterized by being prepared from raw materials in percentage by mass as follows: 80% of Portland cement, 12% of fly ash and 8% of silica fumein a certain proportion. The fiber doping amount of the fiber modified light-weight aggregate concrete is 0.9% of the volume of coarse aggregate. In the preparation process, firstly, fiber is uniformly dispersed in water by use of a dispersing agent and a defoaming agent to be in a monofilament state, and waves and bubbles on the surface of the fiber are eliminated. The high-performance light-weight aggregate concrete adopting the preparation method and the mixing proportion has remarkable functions on improving the crack resistance of the light-weight aggregate concrete and reduce the brittleness coefficient of the light-weight aggregate concrete.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a preparation method of high-performance lightweight aggregate concrete and its mixing ratio. Background technique [0002] The application of lightweight aggregate concrete in the structure can effectively reduce the self-weight of the structure, reduce the size of the section, and help improve the seismic performance of the overall structure. It is a building material with good development prospects and has been widely used in high-rise buildings, ocean engineering, bridge engineering and other fields. Lightweight aggregate concrete is a new type of concrete whose consumption is second only to ordinary concrete. With the continuous development of construction technology and the continuous increase of building height and span, the requirements for the strength, bulk density and toughness of lightweight aggregate concrete are gradually increasing. Most of the currently existing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/00017C04B2201/50C04B18/08C04B18/146C04B2103/302C04B14/06C04B18/027C04B14/48C04B2103/408C04B2103/50C04B14/386
Inventor 吴涛刘喜魏慧孙艺嘉杨雪刘洋刘伯权
Owner CHANGAN UNIV
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