沙漠砂混凝土高温后强度预测及超声检测研究

摘要/Abstract

摘要： 为研究沙漠砂混凝土(DSC)高温后抗压性能,以替代率为0%、20%、40%、60%、80%和100%的沙漠砂等质量替代中砂配制DSC,通过试验研究受火温度和沙漠砂替代率(DSRR)对DSC回弹值、超声波速、抗压强度的影响;建立基于灰色系统理论的高温后DSC强度模型,给出DSC超声回弹综合法测强曲线和受火温度计算公式。结果表明,随着受火温度升高,DSC烧失率逐渐增加,表观颜色由深变浅,DSC抗压强度、回弹值、超声波速呈先增大后减小的趋势。随着DSRR增加,DSC回弹值及抗压强度呈先增大后减小的趋势,当DSRR为40%时,DSC抗压强度及回弹值达到最大。NSGM(1,3)模型预测性能优异,平均相对误差为8.6%,可应用于中长期DSC高温后抗压强度预测,给出的DSC超声回弹综合法测强曲线预测精度满足规范要求。

关键词: 沙漠砂, 混凝土, 高温, 抗压强度, NSGM(1,3)模型, 超声回弹综合法

Abstract: In order to study the compressive properties of desert sand concrete (DSC) after high temperature, desert sand was used to replace medium sand with replacement rate of 0%, 20%, 40%, 60%, 80% and 100% (by mass) to make DSC. The effects of fire temperature and desert sand replacement rate (DSRR) on the rebound value, ultrasonic velocity and compressive strength of DSC were analyzed. The grey prediction strength model of DSC after high temperature was established. Ultrasonic-rebound comprehensive method for measuring strength curve of DSC and formula of fire temperature were deduced. The results show that with the increase of fire temperature, the ignition loss rate of DSC increases gradually, specimen surface colour gradually changes from deep to shallow, and the compressive strength, rebound value, ultrasonic velocity of DSC increase first and then decrease. With the increase of DSRR, the rebound value and compressive strength of DSC increase first and then decrease. When DSRR is equal to 40%, the compressive strength and rebound value of DSC reach the maximum. The NSGM(1,3) model has excellent prediction performance with an average relative error of 8.6%, which can be used to predict the medium and long-term compressive strength of DSC after high temperature. The prediction accuracy of DSC ultrasonic-rebound comprehensive method for measuring strength curve meets the requirements of specification.

Key words: desert sand, concrete, high temperature, compressive strength, NSGM(1,3) model, ultrasonic-rebound comprehensive method

中图分类号:

TU528

李罗胤, 董水博, 刘海峰, 雍雯洁, 车佳玲. 沙漠砂混凝土高温后强度预测及超声检测研究[J]. 硅酸盐通报, 2024, 43(6): 2073-2083.

LI Luoyin, DONG Shuibo, LIU Haifeng, YONG Wenjie, CHE Jialing. Strength Prediction and Ultrasonic Testing of Desert Sand Concrete after High Temperature[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(6): 2073-2083.

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