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（1 安徽理工大學(xué)土木建筑學(xué)院， 淮南 232001； 2 長(zhǎng)安大學(xué)建筑工程學(xué)院， 西安 710061；3 安徽理工大學(xué)深部煤礦采動(dòng)響應(yīng)與災(zāi)害防控國(guó)家重點(diǎn)實(shí)驗(yàn)室， 淮南 232001）

［摘要］用硅粉替代部分水泥摻入混凝土中，對(duì)混凝土試塊進(jìn)行200～800℃的高溫處理，再對(duì)冷卻后的混凝土試塊進(jìn)行質(zhì)量損失率測(cè)定、超聲波檢測(cè)、抗壓強(qiáng)度試驗(yàn)、劈裂抗拉強(qiáng)度試驗(yàn)和微觀試驗(yàn)，并對(duì)試驗(yàn)結(jié)果進(jìn)行分析和擬合。結(jié)果表明：硅粉會(huì)增加混凝土的抗壓強(qiáng)度、脆性以及高溫爆裂幾率，減小高溫后混凝土的質(zhì)量損失率，其最佳摻量為8%，在600℃時(shí)對(duì)混凝土抗壓強(qiáng)度的增強(qiáng)效果最明顯；利用超聲波檢測(cè)法可以較準(zhǔn)確地對(duì)高溫后硅粉混凝土的抗壓強(qiáng)度及其損失率進(jìn)行預(yù)估。

［關(guān)鍵詞］硅粉；高溫；抗壓強(qiáng)度；微觀試驗(yàn)；超聲波檢測(cè)

中圖分類號(hào)：TU528-34文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)09-0070-04

Experimental study on the effect of silica fume on mechanical properties of concrete after high temperature

LUO Xiaobao1,2, LIU Zhen1,3

(1 School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China; 2 School of Civil Engineering and Architecture, Chang′an University, Xi′an 710061, China; 3 State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mine, Anhui University of Science and Technology, Huainan 232001, China)

Abstract:A part of cement is replaced by silica fume and mixed into concrete, and the concrete specimen was treated at a high temperature of 200～800℃. The quality loss rate, ultrasonic testing, compressive strength test, splitting tensile strength test and microscopic test of the cooled concrete specimen were carried out, and the test results were analyzed and fitted. Test results show that silica fume will increase the compressive strength, brittleness and bursting probability of concrete and will reduce the mass loss rate of concrete after high temperature. 8% is the best content of silica fume, whose enhancement effect on the compressive strength of concrete is the most obvious at 600℃. Ultrasonic testing can accurately predict the concrete compressive strength and its loss rate after high temperature.

Keywords:silica fume; high temperature; compressive strength; micro test; ultrasonic testing

作者簡(jiǎn)介：羅小寶，博士研究生，Email：luoxbhz@126.com。