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Self-compacting C120 premixed dry concrete and preparation method thereof

A concrete and self-compacting technology, which is applied in bridge materials, building materials processing, construction, etc., can solve the problems of steel fiber agglomeration and other problems, and achieve the effect of broad requirements, broad application range, and simple and practical preparation method

Active Publication Date: 2021-01-12
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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  • Self-compacting C120 premixed dry concrete and preparation method thereof
  • Self-compacting C120 premixed dry concrete and preparation method thereof
  • Self-compacting C120 premixed dry concrete and preparation method thereof

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 fraction:

[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 the above-mentioned C120 ready-mixed dry concrete is as follows:

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

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

Embodiment 2

[0051] A C120 ready-mixed dry concrete, which consists 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 reducer, 5 parts of defoamer;

[0052] The preparation process of the concrete is the same as in 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 and application of the UHPC concrete of the present invention on domestic high-speed railway bridges was carried out on the Lanzhou-Zhangye high-speed railway Shibalibao Super Bridge. The UHPC structure is lighter in size and its own weight is greatly reduced. The weight of the UHPC composite beam is about 72% of that of ordinary concrete beams. The width is 6m, the girder height at the lowest point is 5.3m, the thickness of the box girder web is 25cm-45cm, the thickness of the bottom plate is 25cm-55cm, the thickness of the roof is 30cm, and the width is 90cm-110cm. It is a typical long-span bridge with light weight, high strength and thin wall structure. Design requirements: the measured value of compressive strength is not less than 120Mpa, the flexural strength is not less than 14MPa, the axial ultimate tensile strength is not less than 6.0MPa, and the volume ratio of steel fiber is not less than 2%. The design requirements need to meet the ex...

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Abstract

The invention provides self-compacting C120 premixed dry concrete and a preparation method thereof, and belongs to the technical field of concrete materials. The self-compacting C120 premixed dry concrete is prepared from the following components in parts by weight: 480-550 parts of Portland cement, 40-55 parts of coarse aggregate, 70-80 parts of steel fiber, 470-550 parts of fine aggregate, 11-15parts of admixture and 145-190 parts of mineral admixture. According to the premixed dry material concrete prepared by the invention, the compressive strength is not lower than 120MPa, the breaking strength is not lower than 20MPa and the axial tensile strength is not lower than 8MPa after 28d, and after the premixed dry material concrete is transported to a construction site and is directly mixed with water, the self-compaction and vibration-free functions can be realized immediately after discharging, and the premixed dry material concrete has high strength and durability.

Description

technical field [0001] The invention belongs to the technical field of concrete materials, and in particular relates 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, is a special concrete with ultra-high strength, ultra-low water absorption, super durability and erosion resistance , suitable for long-span bridges, anti-explosion structures and light-weight, high-strength thin-walled structures, as well as high-abrasion and high-corrosion environments. [0003] At present, steel fiber is an important source of raw materials for ultra-high performance concrete. The uniform distribution of steel fiber inside the concrete structure can significantly improve the tensile and flexural strength of concrete. According to the volume ratio, the amount of steel fiber is g...

Claims

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Application Information

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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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