A kind of self-compacting C120 ready-mixed dry concrete and its preparation method

A concrete and self-compacting technology, applied in bridge materials, construction materials processing, bridges, etc., can solve problems such as steel fiber agglomeration, and achieve the effect of broad requirements, suitable for popularization and application, and simple and practical preparation methods

Active Publication Date: 2022-05-27
YICHUN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the present invention provides a self-compacting C120 ready-mixed dry concrete, which has a self-compacting function and can realize uniform distribution of steel fibers, effectively solving the problem of wet material steel fiber concrete mixing and transportation to pouring. Defects prone to steel fiber agglomeration in

Method used

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  • A kind of self-compacting C120 ready-mixed dry concrete and its preparation method
  • A kind of self-compacting C120 ready-mixed dry concrete and its preparation method
  • A kind of self-compacting C120 ready-mixed dry concrete and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A self-compacting C120 ready-mixed dry concrete is composed of the following components by weight:

[0040] P.Ⅰ52.5 Portland cement 520 parts, mineral powder 100 parts, fly ash 50 parts, silica fume 40 parts, fine stone 50 parts, quartz sand 350 parts, artificial sand 200 parts, steel fiber 80 parts, 8.5 parts of water agent, 5 parts of defoamer;

[0041] The preparation method of above-mentioned C120 ready-mixed dry concrete is as follows:

[0042] (1) Weigh the above-mentioned raw materials by weight fraction, pour Portland cement, fine stone, quartz sand, artificial sand, mineral powder, fly ash and silica fume into the mixer in turn, then add water reducing agent and defoaming agent agent, start dry mixing;

[0043] (2) During the mixing process, the steel fibers are sieved into the mixture of the mixer in batches, and the mixture is stirred while adding, and the stirring lasts for about 300s. After the mixing is uniform, the ready-mixed dry concrete is obtained a...

Embodiment 2

[0051] A C120 ready-mixed dry concrete is composed of the following components in parts by weight: 500 parts of Portland cement of P.I52.5, 100 parts of mineral powder, 50 parts of fly ash, 40 parts of silica fume, fine stone 55 parts, 350 parts of quartz sand, 190 parts of artificial sand, 70 parts of steel fiber, 8 parts of powder water reducing agent, 5 parts of defoamer;

[0052] The preparation process of the concrete is the same as that of Example 1.

[0053] Regarding the performance of C120 ready-mixed dry concrete, the test results are shown in Table 2:

[0054] Table 2 Measured values ​​of concrete mechanical indexes

[0055]

example 1

[0059] The first construction application of the UHPC concrete of the present invention on the domestic high-speed railway bridge is carried out on the Shibailibao Bridge on the Lanzhou-Zhangye high-speed railway. The UHPC structure is lighter in size and the self-weight is greatly reduced. The weight of the UHPC composite beam is about 72% of the weight of the ordinary concrete beam. The width is 6m, the beam height at the lowest point is 5.3m, the web thickness of the box girder is 25cm~45cm, the bottom plate thickness is 25cm~55cm, the top plate thickness is 30cm, and the width is 90cm~110cm. Design requirements: the measured value of compressive strength is not less than 120Mpa, the flexural strength is not less than 14MPa, the ultimate tensile strength of the axial center is not less than 6.0MPa, and the volume ratio of steel fiber is not less than 2%. Compared with ordinary concrete, the compressive strength of UHPC is increased to 5 times, the flexural strength is 10 ti...

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Abstract

The invention provides a self-compacting C120 ready-mixed dry concrete and a preparation method thereof, belonging to the technical field of concrete materials. The self-compacting C120 ready-mixed dry concrete comprises, in parts by weight, 480-550 parts of Portland cement, 40-55 parts of coarse aggregates, 70-80 parts of steel fibers, 470-550 parts of fine aggregates, and admixtures. 11-15 parts, mineral admixtures 145-190 parts. The ready-mixed dry concrete prepared by the present invention has a compressive strength of not less than 120 MPa after 28 days, a flexural strength of not less than 20 MPa and an axial tensile strength of not less than 8 MPa. After being transported to the construction site and directly mixed with water, the material is discharged It can realize self-compacting, free from vibration, and has the function of high strength and durability.

Description

technical field [0001] The invention belongs to the technical field of concrete materials, in particular to a self-compacting C120 ready-mixed dry concrete and a preparation method thereof. Background technique [0002] Ultra-high-performance concrete (UHPC for short), a new type of cement-based composite material formed by incorporating steel fibers or polymer fibers, special concrete with ultra-high strength, ultra-low water absorption, ultra-strong durability and erosion resistance , suitable for long-span bridges, anti-explosion structures and thin-walled structures with light weight and high strength, as well as in high-abrasion and high-corrosion environments. [0003] At present, steel fibers are an important source of raw materials for ultra-high performance concrete. The uniform distribution of steel fibers in the concrete structure can significantly improve the tensile and flexural strength of concrete. However, due to the relatively low water glue during construct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B14/48E04G21/02E01D21/00E01D22/00E01D101/24
CPCC04B28/04C04B14/48E04G21/02E01D21/00E01D22/00C04B2201/50E01D2101/24C04B14/02C04B14/06C04B18/141C04B18/08C04B18/146C04B2103/302C04B2103/50
Inventor 林超谭贤君陈杰华段海松郭振枝逄鲁锋常青山
Owner YICHUN UNIVERSITY
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