本文選題：混凝土 + 高溫　； 參考：《新型建筑材料》2017年08期

【摘要】：對混凝土立方體試件進(jìn)行高溫?zé)Y(jié),分析了試件外觀裂縫的產(chǎn)生和發(fā)展,質(zhì)量損失率等宏觀變化。通過對高溫混凝土試件在不同冷卻方式下的抗壓強(qiáng)度、劈拉強(qiáng)度進(jìn)行力學(xué)性能試驗,對比出不同冷卻方式下高溫混凝土的抗壓強(qiáng)度及劈拉強(qiáng)度的差異和變化趨勢,解釋了高溫混凝土強(qiáng)度變化的原因,擬合出對應(yīng)的強(qiáng)度變化曲線。結(jié)果表明:高溫混凝土經(jīng)自然冷卻后出現(xiàn)強(qiáng)度反彈跡象,在400℃達(dá)到峰值39.9 MPa;噴淋冷卻使得混凝土抗壓強(qiáng)度在500℃達(dá)到峰值36.7 MPa,在500℃后,強(qiáng)度高于自然冷卻后的混凝土強(qiáng)度。劈拉強(qiáng)度隨著溫度升高持續(xù)降低,800℃時強(qiáng)度損失達(dá)到80%。該研究可為受高溫后的混凝土結(jié)構(gòu)的設(shè)計、分析提供理論依據(jù)。
[Abstract]:The concrete cube specimens were sintered at high temperature. The appearance cracks and the mass loss rate of the specimens were analyzed. The compressive strength and splitting tensile strength of high temperature concrete specimens under different cooling conditions are tested by mechanical performance tests. The differences and trends of compressive strength and splitting tensile strength of high temperature concrete under different cooling methods are compared. The reason of strength change of high temperature concrete is explained and the corresponding curve of strength change is fitted. The results show that the strength rebound of high temperature concrete after natural cooling shows a peak value of 39.9 MPA at 400 鈩，

本文編號：2018967