Self-compaction fair-faced concrete with strength grade of C50

A technology of fair-faced concrete and strength grades, applied in the field of self-compacting fair-faced concrete, which can solve the problems of poor appearance quality of concrete molding, difficulty in blanking and vibrating, etc., and achieve self-compacting performance and appearance clear water effect, improve work efficiency, The effect of good fluidity

Inactive Publication Date: 2012-09-26
JIANGSU VOCATIONAL INST OF ARCHITECTURAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of dense steel bars in stiffened concrete structures, great difficulty in blanking and vibrating, and poor appearance quality of concrete molding, the invention provides a self-compacting fair-faced concrete with a strength grade of C50 for stiffened concrete structures

Method used

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Experimental program
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Embodiment 1

[0022] The steel bar spacing in the implementation project is ≤50mm, which is within the range of the minimum steel bar spacing of 35-60mm. The vertical or oblique member columns have small cross-sectional dimensions, large heights, and complex structures.

[0023] It is advisable to choose self-compacting concrete with self-compacting grade 1. The fluidity, segregation resistance and filling performance of self-compacting concrete are required to meet the performance requirements of "Technical Regulations for the Application of Self-compacting Concrete" (CECS203:2006). U-shaped box test filling height, slump expansion T50, and V funnel are controlled by time. It is required that the appearance quality of stiffened concrete structure should reach the appearance effect of fair-faced concrete, that is, directly use the natural texture of concrete molding as the finishing effect, without decoration after demoulding, green, low-carbon, and environmental protection. The self-compac...

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Abstract

The invention discloses self-compaction fair-faced concrete with the strength grade of C50 used for a stiffness concrete structure, belonging to the field of concrete. The mixed proportion comprises 335kg/m<3> cement, a 110kg/m<3> complex mineral additive, 40kg/m<3> coal ash, 850kg/m<3> fine aggregate sand, 910kg/m<3> coarse aggregate and additive PCA; the water-binder ratio is 0.32, the sand ratio is 48%, the dosage replacement rate of the mineral additive is 29% and the water-powder ratio is 0.82; in the unit volume of concrete, the stone occupies 31%, the sand occupies 32.5%, the stone porosity is 36.5%, the rubber powder occupies 19%, the water occupies 15.5% and the gas content is 2%. The self-compaction fair-faced concrete has the effect that the mobility, the segregation resistance and the self fallibility of the concrete meet the requirement, the appearance and colour of the molded concrete are substantially in consistency with little bubbles and dispersion. The self-compaction fair-faced concrete is simple to operate and is particularly suitable for constructing fair-faced concrete of a vertical or inclined stiffness concrete structure with dense steel bars.

Description

technical field [0001] The invention relates to a self-compacting fair-faced concrete, in particular to a C50 self-compacting fair-faced concrete used for stiffened concrete structures. It can meet the needs of stiffened concrete structures with intensive reinforcement configuration, and requires good self-compacting performance, and the appearance quality of concrete can reach the appearance of fair-faced concrete. The strength level of stiffened concrete structures is C50. Background technique [0002] Stiffened concrete structures, also known as steel-concrete composite structures, are composed of concrete, steel bars, longitudinal steel bars, and transverse steel bars. Rolled or welded section steel is arranged inside the concrete section. In order to improve the bonding performance between the section steel and concrete, a certain number of shear connectors are added on the surface of the section steel, and longitudinal reinforcement and stirrups are arranged around the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
Inventor 王军强姜艳霞孙克纬张晓丹
Owner JIANGSU VOCATIONAL INST OF ARCHITECTURAL TECH
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