Unlock instant, AI-driven research and patent intelligence for your innovation.

Bearing structure fair-faced concrete mix proportion design method

A technology for fair-faced concrete and mix ratio design, which is applied in the field of concrete mix ratio design, and can solve the unrestricted design requirements of fair-faced concrete mix ratio, the amount of cement and the amount of cementitious material and its grade, technical parameters of slump, load-bearing The mix proportion design method of structural fair-faced concrete does not have general guiding significance and other problems, so as to achieve the effect of scientific and reasonable concrete mix proportion design method and strong operability

Inactive Publication Date: 2021-02-09
SHANGHAI BAOYE GRP CORP
View PDF8 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the technical scheme does not limit the design requirements of the fair-faced concrete mix ratio, and does not clearly limit the technical parameters such as the amount of cement, the amount of cementitious material, its grade, and slump.
Therefore, it has no general guiding significance for the design method of fair-faced concrete mix ratio in load-bearing structures.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Bearing structure fair-faced concrete mix ratio design method of the present invention comprises the following steps:

[0029] a, configure the materials used for fair-faced concrete, which include cement, mineral admixtures, fine aggregate, coarse aggregate and repair coating; raw material requirements for fair-faced concrete in this embodiment: cement: portland cement or ordinary Portland cement, and the strength is not lower than 42.5. It is better to use slag cement with low heat of hydration for the cement of special-shaped large-section components; mineral admixtures: high-quality fly ash, finely ground slag powder, silicon Ash, natural zeolite powder, and fly ash should use slag fly ash, and the quality requirements should at least meet the standard of Class II; The gradation shall comply with the provisions in Table 1; the gradation category of sand shall comply with the provisions in Table 2. For the sand used for mortar, the accumulated sieve allowance of 4.7...

Embodiment 2

[0035] Bearing structure fair-faced concrete mix ratio design method of the present invention comprises the following steps:

[0036] Step 1: First confirm the water-binder ratio according to the design strength of fair-faced concrete. The water-binder ratio of C50 is between 0.35-0.4, and the water-binder ratio of C60 is between 0.32-0.38. The ratio is very important and represents the difference in intensity level.

[0037] Step 2: According to the regulations in "Technical Regulations for the Application of Fair-faced Concrete" JGJ169-2009, when preparing fair-faced concrete, mineral admixtures should be used, and mineral admixtures can not only improve the workability of concrete, but also adjust the color of the concrete. Reaching the design requirements can reduce the heat of hydration and prevent the cracking of fair-faced concrete for large components.

[0038] Step 3: Confirm the content of stones. High-strength concrete often has high requirements on the strength of...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
voidageaaaaaaaaaa
Login to View More

Abstract

A method for designing the mix proportion of fair-faced concrete of a bearing structure is characterized by comprising the following steps: a, preparing materials for the fair-faced concrete, whereinthe materials comprise cement, mineral admixtures, fine aggregate, coarse aggregate and repair paint; b, setting the mix proportion of the fair-faced concrete is determined according to the provisionsof General Concrete mix proportion Design Specifications; c, employing forced stirring equipment when the fair-faced concrete is stirred during fair-faced concrete preparation and transportation, wherein the prepared fair-faced concrete mixture should be stable in working performance and free of bleeding and segregation phenomena, a tank car should be rapidly stirred for 1 min or longer before fair-faced concrete pouring, water is forbidden to be added halfway, and the slump of the fair-faced concrete mixture when the fair-faced concrete mixture enters a pump is controlled. The bearing structure fair-faced concrete mix proportion design method has the advantages that the general guiding significance on bearing structure fair-faced concrete mix proportion design is achieved, the practicalvalue is emphasized based on actual operation, and a new path of the bearing structure fair-faced concrete mix proportion design scheme is created.

Description

technical field [0001] The invention relates to a method for designing the proportion of concrete, in particular to a method for designing the proportion of fair-faced concrete for load-bearing structures. Background technique [0002] Chinese patent CN111056791A disclosed a steel shell immersed tube self-compacting concrete mix ratio design method on April 24, 2020, wherein the mix ratio design method includes: configuring the materials used in the concrete; using the fixed sand and stone volume content calculation method to calculate the preliminary Mixing ratio; according to the principle of orthogonal test design method, analyze the influencing factors of the preliminary mixing ratio, and obtain the optimal mixing ratio; carry out test verification on the optimal mixing ratio, and obtain the optimal mixing ratio; conduct process tests on the optimal mixing ratio, Determine the optimal mix ratio to meet production requirements. However, this concrete mix ratio design met...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/08C04B41/61
CPCC04B28/04C04B28/08C04B41/61C04B41/45C04B18/08C04B18/141C04B18/146C04B14/047C04B14/06C04B14/048C04B14/28C04B14/14C04B22/002
Inventor 刘泰奇蔡鲜平叶华姚骥蒋正远陈琳刘明华
Owner SHANGHAI BAOYE GRP CORP