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Steam-cured ultra-high-performance concrete for prefabricated bridge deck slab and rapid design and optimization method for mix proportion of steam-cured ultra-high-performance concrete

A technology with ultra-high performance and optimization method, applied in chemical instruments and methods, bridge construction, bridges, etc., can solve the problem of increasing the time cost and economic cost of engineering application, increasing the design difficulty due to the fluctuation of the value, and insufficient adaptability of the construction site, etc. problem, to achieve the effect of universality, easy large-scale production and low cost

Active Publication Date: 2022-04-12
SHANDONG TRAFFIC PLANNING DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some studies proposed the component ratio of ultra-high performance concrete based on the application of raw materials, and proposed the dispersion method of each component, but did not involve the design method of mix ratio; some researchers proposed the UHPC strength design method based on the strength threshold, but in the method There are many possibilities in the application of the involved grading curves and strength curves, and the fluctuation of the value of the parameter "q" increases the difficulty of the actual mix ratio design. At the same time, this method is not adaptable to the actual construction site.
The research at the current stage is focused on the preparation ratio of the raw materials used, and there is a problem of insufficient adaptability of raw materials for different regions, and the current optimization design for the construction mix ratio is insufficient, which increases the time cost and economic cost of engineering application

Method used

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  • Steam-cured ultra-high-performance concrete for prefabricated bridge deck slab and rapid design and optimization method for mix proportion of steam-cured ultra-high-performance concrete
  • Steam-cured ultra-high-performance concrete for prefabricated bridge deck slab and rapid design and optimization method for mix proportion of steam-cured ultra-high-performance concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The "progressive layered filling optimization method" includes the following steps: firstly, the maximum bulk density method is used to determine the blending ratio of fine aggregate, and according to the type of fine aggregate supplied (such as A, B, and C), first, according to A +B to determine the optimal blending ratio of A and B with a ratio difference of 0.05, and then determine the optimal blending ratio of the A / B mixture to C according to the composite stacking of the A / B optimal blend ratio mixture +C at a ratio difference of 0.05, thus Determine the optimal blending ratio of A+B+C; the second step is to prepare the cement mortar test block to determine the blending ratio of each component of the cementitious material, first determine the blending ratio of cement and silica fume, and then according to the basic requirements of workability , on the premise of not reducing the strength, determine the blending ratio of microbeads; the third step is to determine th...

Embodiment 2

[0035] "On-site optimization method based on total water consumption" includes the following steps: first determine the design mix ratio and the extreme value of total water consumption, the total water consumption includes water added and water in water reducer; secondly determine the site ambient temperature, humidity and According to the working state of the mixing equipment, determine the adjustment coefficient of the total water consumption ±15% according to the state of the mixture. This step ensures that the water consumption is ≤ the extreme value of the total water consumption, and comprehensively adjusts the water-binder ratio and the amount of water reducing agent to obtain the optimal construction. mix ratio.

Embodiment 3

[0037] The optimal mix ratio of steam-cured ultra-high performance concrete for prefabricated slab determined based on the method of Examples 1 and 2 is as follows:

[0038] The steam-cured ultra-high performance concrete for prefabricated panels is composed of cementitious materials, fine aggregate, steel fibers, water reducing agent and water, and the cementitious materials are composed of cement, silica fume and microbeads. In parts by mass, the UHPC includes 100 parts of cementitious material, 100-130 parts of fine aggregate, 17-21 parts of steel fiber, 2.0-3.0 parts of water reducing agent, and 15-19 parts of water; The proportions of the components are 70-78 parts of cement, 15-20 parts of silica fume, and 2-15 parts of glass microbeads. The cement is made of ordinary Portland cement with the label of 52.5; the silica fume is made of BK93 semi-encrypted type, and the particle size is divided into 1-20 μm, of which the particle size is between 5-15 μm, accounting for more...

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Abstract

The invention relates to steam-cured ultra-high performance concrete for a prefabricated bridge deck slab and a rapid design optimization method of a mix proportion, namely a progressive layered filling optimization method. The method comprises the following steps: determining the mixing proportion of fine aggregate; preparing a cement mortar test block, and determining the doping proportion of each component of the cementing material; determining the basic proportion of the cementing material to the fine aggregate; determining a water-binder ratio and a water reducing agent mixing amount; the steel fiber mixing amount is determined, and the UHPC mixing proportion is obtained; and preparing the steam-cured ultra-high performance concrete of the prefabricated bridge deck slab. The method quickly completes the design of the mix proportion based on available raw materials, does not need excessive theoretical calculation, and is convenient and efficient. Meanwhile, the invention further provides a field optimization method based on the total water consumption, the field optimization method is suitable for optimization of the field mix proportion, under the control principle of the total water consumption, the mix proportion can be flexibly and flexibly adjusted based on the field condition, multiple test verification is not needed any more, iteration of the laboratory-construction field mix proportion can be reduced for multiple rounds, and the construction efficiency is improved. And the influence on the construction progress is reduced.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a steam-cured ultra-high-performance concrete used for prefabricated bridge decks and a rapid design and optimization method for the mix ratio. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Ultra-High Performance Concrete (UHPC) is a cement-based composite material with ultra-high strength, ultra-high toughness and ultra-high durability, which is formulated based on the close packing theory (DSP). It meets the needs of high-strength, light-weight, durable and rapid construction of current bridge engineering, and can also meet the requirements of sustainable soci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04G16C60/00E01D19/12B28C5/40B28C7/04
CPCY02W30/91
Inventor 李怀峰徐召董滨王宏博马汝杰陈昊王健徐润岳秀鹏庄伟
Owner SHANDONG TRAFFIC PLANNING DESIGN INST
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