|Table of Contents|

Mechanical Properties of Manufactured Sand Concrete with Different Stone Powder Content After High Temperatures(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2021年03期
Page:
80-89
Research Field:
Publishing date:

Info

Title:
Mechanical Properties of Manufactured Sand Concrete with Different Stone Powder Content After High Temperatures
Author(s):
XIE Kai-zhong1; 2;  LIU Zhen-wei1;  ZHU Mao-jin1;  MA Da-li1
(1. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, Guangxi, China; 2. Key Laboratory of Engineering Disaster Prevention and Structural Safety of Ministry of Education,Guangxi University, Nanning 530004, Guangxi, China)
Keywords:
manufactured sand concrete;  high temperature;  stone powder content;  strength;  microstructure
PACS:
TU528
DOI:
10.19815/j.jace.2020.09070
Abstract:
Based on the parameters of temperature and stone powder content, 210 cube specimens(100 mm×100 mm×100 mm)of manufactured sand concrete(MSC)were designed. The physical and mechanical properties after high temperature were tested. The mass loss rate, compressive strength and splitting tensile strength of specimens were obtained. The degradation models of compressive strength and splitting tensile strength after high temperature of MSC were established. The micro-mechanism of mechanical properties deterioration of MSC after high temperature were investigated by X-ray diffraction(XRD)and scanning electron microscope(SEM). The evaluation formulas of compressive strength and splitting tensile strength of MSC after high temperature based on the maximum fire temperature and mass loss rate were put forward. The results indicate that with the increase of temperature, the surface color of MSC specimens change from gray to reddish brown, and finally to gray. Temperature crevice and spalling arise on the surface of the specimen under high temperature. The mass loss rate of the specimen increases significantly with the increase of stone powder content. The compressive strength and splitting tensile strength of concrete decrease with temperature rise. The compressive strength and splitting tensile strength of the MSC specimens firstly increase, then decrease when the stone powder content is increased, and the concrete strength goes for a maximum when the content of stone powder reaches 10%(mass fraction). The deterioration model of compressive strength and splitting tensile strength of MSC after high temperature based on the measured results has good fitting degree. The amount of hydration products of MSC such as ettringite and calcium hydroxide can be promoted by adding stone powder. The cement hydrate dehydrates and decomposes in MSC, which makes the internal cracks and pores of concrete increase after high temperature of 700 ℃.

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Last Update: 2021-05-20