- 摘 要
-
（西安建筑科技大學(xué)土木工程學(xué)院， 西安 710055）
［摘要］試驗(yàn)研究不同水膠比(0-34，0-4，0-5)、不同粉煤灰摻量(0%，30%，50%)混凝土試件，經(jīng)不同溫度(20，200，400，600℃)作用后抗壓強(qiáng)度的變化規(guī)律。結(jié)果表明：200℃時(shí)低水膠比(0-34)混凝土抗壓強(qiáng)度損失率相對較小，600℃時(shí)高水膠比(0-5)混凝土抗壓強(qiáng)度損失率相對較小；對于大摻量粉煤灰混凝土試件，混凝土抗壓強(qiáng)度隨粉煤灰摻量的增大而減小；粉煤灰摻量為30%時(shí)，高溫導(dǎo)致的強(qiáng)度損失相對較小。研究結(jié)果可為混凝土結(jié)構(gòu)火災(zāi)后的損傷評估和維修加固提供參考。
［關(guān)鍵詞］水膠比； 粉煤灰； 高溫； 抗壓強(qiáng)度； 損傷評估； 維修加固
中圖分類號：TU502-6文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2019)22-0093-04
Influences of water-binder ratio and fly-ash replacement level on compressive strength of concrete after high temperature
Wu Yaopeng, Li Yanhao, Zhang Xu, Wang Yonghui
(School of Civil Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, China)
Abstract:The compressive strengths of concrete specimens with different water-binder ratios (0-34, 0-4 and 0-5) and different fly-ash replacement levels (0%, 30% and 50%) after different temperatures (20, 200, 400 and 600 ℃) had been experimentally investigated. The results showed that the compressive strength loss rate of the concrete with low water-binder ratio (0-34) after 200℃ was relatively small, and the compressive strength loss rate of the concrete with high water-binder ratio (0-5) after 600℃ was relatively small; for high volume fly-ash concrete, the compressive strength of the concrete decreased with the increasing fly-ash replacement level; for the concrete with the fly-ash replacement level of 30%, the compressive strength loss caused by high temperature was relatively small. The results can provide references for the damage evaluation and maintenance and reinforcement of concrete structure after fire.
Keywords:water-binder ratio; fly ash; high temperature; compressive strength; damage evaluation; maintenance and reinforcement
*國家自然科學(xué)基金項(xiàng)目（51108371），陜西省教育廳重點(diǎn)實(shí)驗(yàn)室科研計(jì)劃項(xiàng)目（16JS050）。
作者簡介：吳耀鵬，博士，副教授，碩士生導(dǎo)師，Email: wyp@xauat.edu.cn。
- 下載地址
-
