Low-shrinkage creep wet joint ultrahigh-strength concrete material and preparation method thereof

A technology of ultra-high-strength concrete and low shrinkage and creep, which is applied in the field of building materials, can solve the problems of wet joint concrete shrinkage and creep, and achieve low shrinkage and creep, excellent mechanical properties and durability, and good working performance

Inactive Publication Date: 2020-06-19
CHINA RAILWAY BRIDGE SCI RES INST LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The embodiment of the present application provides a low-shrinkage and creep wet-joint ultra-high-strength concrete material and its preparation method to solve the shrinkage and creep problem of wet-joint concrete in related technologies

Method used

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  • Low-shrinkage creep wet joint ultrahigh-strength concrete material and preparation method thereof
  • Low-shrinkage creep wet joint ultrahigh-strength concrete material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The low shrinkage and creep wet joint ultra-high strength concrete material prepared in this example has the ratio of raw materials as shown in Table 1:

[0035] Table 1 Low shrinkage creep wet joint ultra-high strength concrete material mix ratio (Kg / m 3 )

[0036] cement mineral admixture fine aggregate Coarse aggregate Superplasticizer steel fiber water 600 200 750 650 10.6 100 160

[0037] Mix 600 parts by weight of cement, 200 parts by weight of mineral admixture, 750 parts by weight of fine aggregate, 650 parts by weight of coarse aggregate, 100 parts by weight of steel fiber and 10.6 parts by weight of water reducing agent in a twin-shaft forced mixer , the stirring time is 2 minutes; 160 parts by weight of water are all added, and stirred for 4 minutes. After the concrete is fully fluidized, continue to stir for 1 minute to obtain a concrete mixture; pour the concrete mixture into a cast iron mold for molding, vibration, and t...

Embodiment 2

[0042] The low shrinkage and creep wet joint ultra-high-strength concrete material prepared in this example has a ratio of raw materials as shown in Table 2:

[0043] Table 2 Low shrinkage creep wet joint ultra-high strength concrete material mix ratio (Kg / m 3 )

[0044] cement mineral admixture fine aggregate Coarse aggregate Superplasticizer steel fiber water 550 225 825 600 12 150 155

[0045] Mix 550 parts by weight of cement, 225 parts by weight of mineral admixtures, 825 parts by weight of fine aggregate, 600 parts by weight of coarse aggregate, 150 parts by weight of steel fiber and 12 parts by weight of water reducing agent in a vertical shaft planetary forced mixer, The stirring time is 3 minutes; 155 parts by weight of water are all added, and stirred for 3 minutes. After the concrete is fully fluidized, continue stirring for 2 minutes to obtain a concrete mixture; The environment of 20±5°C and relative humidity ≥50% should be lef...

Embodiment 3

[0050] The low shrinkage and creep wet joint ultra-high strength concrete material prepared in this example has the ratio of raw materials as shown in Table 3:

[0051] Table 3 Low shrinkage and creep wet joint ultra-high strength concrete material mix ratio (Kg / m 3 )

[0052] cement mineral admixture fine aggregate Coarse aggregate Superplasticizer steel fiber water 650 175 800 550 11.4 78 178

[0053] Mix 650 parts by weight of cement, 175 parts by weight of mineral admixture, 800 parts by weight of fine aggregate, 550 parts by weight of coarse aggregate, 78 parts by weight of steel fiber and 11.4 parts by weight of water reducing agent in a twin-shaft forced mixer , the stirring time is 2min; 178 parts by weight of water are all added and stirred for 3min, after the concrete is fully fluidized, continue to stir for 2min to obtain a concrete mixture; Stand for 1 day in an environment of 20±5°C and relative humidity ≥50%, remove the formwo...

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Abstract

The invention relates to a low-shrinkage creep wet joint ultrahigh-strength concrete material and a preparation method thereof. The material comprises the following raw materials in proportion: 550kg/m<3> to 650kg/m<3> of cement, 150kg/m<3> to 250kg/m<3> of a mineral admixture, 675kg/m<3> to 825kg/m<3> of fine aggregate, 575kg/m<3>-725kg/m<3> of coarse aggregate, 10.3kg/m<3>-12.2kg/m<3> of a waterreducing agent, 78kg/m<3> to 156kg/m<3> of steel fibers, and 152kg/m<3> to 172kg/m<3> of water, wherein the mineral admixture is composed of an expanding agent and at least two of silica fume, superfine mineral powder, limestone powder, rice hull ash, metakaolin and fly ash microspheres, the coarse aggregate is any one or more of basalt, granite and diabase, the particle size is 5-10mm, and the needle sheet shape content is smaller than or equal to 1%. The low-shrinkage creep wet joint ultrahigh-strength concrete material prepared from the raw materials has the advantages of low shrinkage creep, good working performance, excellent mechanical properties, excellent durability and the like, is used for bridge wet joints, and can reduce the influence of shrinkage creep, guarantee the later durability and prolong the service life of bridges.

Description

technical field [0001] The application relates to the technical field of building materials, in particular to a low-shrinkage creep wet joint ultra-high-strength concrete material and a preparation method thereof. Background technique [0002] With the vigorous development of traffic, long-span composite bridges have been widely used in wide waters. In composite bridges, the shrinkage and creep of wet joint concrete will be the key issue affecting the overall structure of the bridge. It will cause stress redistribution, resulting in increased deformation of the structure, increased deflection, and excessive prestress loss, etc., making Bridge structures prematurely fail or lose function. Contents of the invention [0003] The embodiments of the present application provide a low-shrinkage and creep wet-joint ultra-high-strength concrete material and a preparation method thereof, so as to solve the shrinkage-creep problem of wet-joint concrete in the related art. [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B2201/52C04B14/106C04B18/08C04B18/146C04B22/14C04B14/06C04B14/02C04B14/48C04B2103/302
Inventor 陈露一李信黄有强张志豪郑丽王亚洲
Owner CHINA RAILWAY BRIDGE SCI RES INST LTD
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