- 摘 要
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（1 江蘇大學(xué)土木工程與力學(xué)學(xué)院， 鎮(zhèn)江 212013； 2 河海大學(xué)土木與交通學(xué)院， 南京 210098;3 鹽城工學(xué)院土木工程學(xué)院， 鹽城 224051）
［摘要］通過對單摻和復(fù)摻碳酸鈣晶須及PVA纖維的高性能細(xì)骨料混凝土分別進(jìn)行抗壓、抗折和劈拉試驗，研究不同尺度纖維對高性能細(xì)骨料混凝土力學(xué)性能的影響，并采用掃描電鏡對纖維混凝土微觀結(jié)構(gòu)進(jìn)行觀測，分析纖維對混凝土性能的影響機理。結(jié)果表明，摻入適量碳酸鈣晶須或PVA纖維均可提高細(xì)骨料混凝土的力學(xué)性能，但提高幅度不同； 單摻PVA纖維混凝土強度提高較明顯，其抗壓、抗折和劈拉強度提高可達(dá)11%，20%和35%。碳酸鈣晶須和PVA纖維混摻后可進(jìn)一步改善混凝土的力學(xué)性能，混凝土抗壓、抗折和劈拉強度的提高幅度分別增至14%，44%和48%。微觀結(jié)構(gòu)觀測結(jié)果顯示，碳酸鈣晶須和PVA兩種纖維可在不同尺度上發(fā)揮對混凝土的增強作用。
［關(guān)鍵詞］復(fù)合增強； 高性能細(xì)骨料混凝土； 力學(xué)性能； 碳酸鈣晶須； PVA纖維
中圖分類號：TU528-572文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2020)22-0077-06
Experimental study on mechanical properties of high-performance fine aggregate concrete composite reinforced by fiber at different scales
ZHANG Zheng1, ZHANG Qin2, LIU Ronghao1, XUN Yong1,3
（1 Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, China;2 College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China;3 School of Civil Engineering, Yancheng Institute of Technology, Yancheng 224051, China)
Abstract:The compressive, flexural and split tensile tests were conducted respectively on high-performance fine aggregate concrete with single mixing and compound mixing calcium carbonate whisker and PVA fiber to study the influences of fiber at different scales on mechanical properties of high-performance fine aggregate concrete. The microstructure of fiber reinforced concrete was observed by scanning electron microscope, and the influence mechanism of fiber on concrete performance was analyzed. The results show that the mechanical properties of fine aggregate concrete can be improved by adding calcium carbonate whisker or PVA fiber, but the improvement range is different; the strength of concrete mixed with PVA fiber increases obviously, and its compressive, flexural and split tensile strength increase up to 11%, 20% and 35% respectively. The mechanical properties of concrete can be further improved by mixing calcium carbonate whisker and PVA fiber, and the compressive, flexure and split tensile strength of concrete can be increased to 14%, 44% and 48% respectively. The microstructure observation results show that calcium carbonate whisker and PVA fiber could enhance concrete at different scales.
Keywords:composite reinforcement; high-performance fine aggregate concrete; mechanical property; calcium carbonate whisker; PVA fiber
*國家自然科學(xué)基金資助項目（51508154），江蘇省自然科學(xué)基金資助項目（BK20150803），中國博士后科學(xué)基金面上項目（2015M581711），住房和城鄉(xiāng)建設(shè)部科技項目（2015K4012），江蘇省建設(shè)系統(tǒng)科技項目（2014ZD08）。
作者簡介：張正，碩士研究生，Email:2653874556@qq.com；通信作者：張勤,博士，副教授，Email:zhangqin8190@163.com。
