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Method for testing bending performance of steel-PVA hybrid fiber concrete after high temperature

A hybrid fiber and test method technology, which is applied in the direction of applying a stable bending force to test the strength, strength properties, measuring devices, etc. High temperature capability, etc.

Pending Publication Date: 2022-01-21
WUHAN UNIV OF SCI & TECH
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Problems solved by technology

The existing test methods for the flexural performance of steel-PVA hybrid fiber concrete after high temperature are relatively traditional and simple, and the research on the high temperature resistance of concrete is not thorough enough to reflect the real high temperature resistance of steel-PVA hybrid fiber concrete

Method used

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  • Method for testing bending performance of steel-PVA hybrid fiber concrete after high temperature
  • Method for testing bending performance of steel-PVA hybrid fiber concrete after high temperature
  • Method for testing bending performance of steel-PVA hybrid fiber concrete after high temperature

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specific Embodiment approach

[0016] The types of specimens are divided into ordinary concrete and hybrid fiber concrete; the temperature conditions are set at 20°C, 200°C, 400°C, 600°C, and 800°C; combined with the current situation of building fire protection, the constant temperature time of the specimen after heating up is uniformly 60min; The volume dosage is 0.9% and 1.5% (according to the previous research of the research group and related literature); the strength of concrete is divided into C30 ordinary concrete; the production of specimens is strictly in accordance with the "Standard for Fiber Concrete Test Methods" CECS13: 2009 and "Mechanical Performance Test of Ordinary Concrete The relevant provisions of the method standard "GB / T50081-2002 shall be implemented. Since the fiber length is not greater than 40mm, a beam-type specimen with a cross-sectional size of 100mm×100mm is used. The span of the support (loaded support spacing) is three times the side length of the section, and the length of...

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Abstract

The invention discloses a method for testing the bending performance of steel-PVA hybrid fiber concrete after high temperature, and relates to the field of building material detection. According to the method for testing the bending performance of the steel-PVA hybrid fiber concrete after the high temperature, the cement is Xinhua P.O.42.5 ordinary Portland cement, fine aggregate is ordinary medium sand, and coarse aggregate is gravel with the particle size not larger than 20 mm. wherein the steel fibers are milled wave-shaped steel fibers produced by the Hengshui Shengze Building Material Co., Ltd; and the PVA fibers are high-strength and high-modulus polyvinyl alcohol fibers produced by Shanghai Yingjia Industry Development Co., Ltd. The high-temperature heating test furnace adopts an SX2-15-10 intelligent muffle furnace produced by Dongtai Shuangyu company, Jiangsu Yancheng City, and the hearth size is 60 cm * 40 cm * 30 cm.

Description

technical field [0001] The invention relates to the field of building material detection, in particular to a test method for bending performance of steel-PVA hybrid fiber concrete after high temperature. Background technique [0002] PVA is a kind of high-elastic high-modulus fiber. Adding a certain amount of PVA to concrete can control the cracks caused by temperature and plastic shrinkage of concrete, and effectively improve the impermeability and impact resistance of concrete. Steel-polyvinyl alcohol (PVA for short) hybrid fiber concrete is a composite material composed of cement slurry, mortar or concrete as the base material, and steel fibers and PVA as reinforcing materials mixed into the base material. Fiber and concrete exert their respective properties in the work. Steel fibers can significantly improve the tensile strength and ductility of concrete, and have a good effect on preventing the expansion of concrete cracks. Measuring the flexural properties of steel-P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/20
CPCG01N3/20G01N2203/0003G01N2203/0048G01N2203/0075G01N2203/0226
Inventor 朱志颖
Owner WUHAN UNIV OF SCI & TECH
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