884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

(內(nèi)蒙古農(nóng)業(yè)大學(xué)水利與土木建筑工程學(xué)院， 呼和浩特 010018)

［摘要］通過對(duì)碳纖維的體積摻量分別為0，0.3%，0.6%，0.9%，1.2%，1.5%的輕骨料混凝土進(jìn)行3，7，14，28d混凝土立方體抗壓強(qiáng)度試驗(yàn)和劈裂抗拉試驗(yàn)，分析了碳纖維的摻入對(duì)混凝土力學(xué)性能的影響；利用環(huán)境掃描電鏡試驗(yàn)觀測(cè)碳纖維與混凝土界面的粘結(jié)關(guān)系；利用Rapid Air 457分析儀測(cè)定混凝土內(nèi)部的氣孔結(jié)構(gòu)，再結(jié)合灰色關(guān)聯(lián)度分析，探討混凝土微觀氣孔結(jié)構(gòu)與宏觀力學(xué)性能的關(guān)系。試驗(yàn)表明：當(dāng)碳纖維的體積摻量為0.3%時(shí)，混凝土的力學(xué)性能達(dá)到最優(yōu)，抗壓強(qiáng)度提高了10.28%；碳纖維的摻入可以細(xì)化混凝土內(nèi)部的氣孔結(jié)構(gòu)，使含氣量降低了11.59%，超大孔隙和大孔隙的頻率分別降低了13.63%和13.47%；在氣孔結(jié)構(gòu)參數(shù)中氣泡的平均弦長是影響混凝土強(qiáng)度的最主要因素。 

［關(guān)鍵詞］輕骨料混凝土； 碳纖維； 力學(xué)性能； 環(huán)境掃描電鏡； 氣孔結(jié)構(gòu)； 灰色關(guān)聯(lián)度分析 

中圖分類號(hào)：TU528-2 文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)11-0108-05

Experimental study on mechanical properties of carbon fiber light-weight aggregate concrete 

YANG  Hong,  WANG  Hailong,  WANG  Hongshan,  SUN  Song,  LIU  Simeng,  WANG  Zi 

(College of Water Conservancy and Civil Construction Engineering， Inner Mongolia Agricultural University， Huhhot 010018， China) 

Abstract: Through the 3, 7, 14, 28d concrete cube compressive strength test and split tensile test of light-weight aggregate concrete with the volume content of carbon fiber of 0, 0.3%, 0.6%, 0.9%, 1.2%, 1.5%, respectively. The influence of the incorporation of carbon fiber on the mechanical properties of concrete was analyzed; and the bonding relationship between carbon fiber and concrete interface was observed by environmental scanning electron microscope test; and the pore structure inside the concrete was measured by the Rapid Air 457 analyzer. Combined with the gray correlation analysis, the relationship between the microscopic pore structure of concrete and the macroscopic mechanical properties was discussed. Experiments show that when the volume content of carbon fiber is 0.3%, the mechanical properties of concrete are optimal, and the compressive strength is increased by 10.28%. The incorporation of carbon fiber can refine the pore structure inside the concrete, the air content is reduced by 11.59%, and the frequencies of super-large pores and macropores are reduced by 13.63% and 13.47%, respectively. The average chord length of the bubbles in the pore structure parameters is the most important factor affecting the strength of concrete.

Keywords:light-weight aggregate concrete； carbon fiber； mechanical property； environmental scanning electron microscope； pore structure； gray correlation degree analysis

*國家自然科學(xué)基金項(xiàng)目(51669026，52069024)。

 作者簡介：楊虹，碩士研究生，Email：1834427532@qq.com；通信作者：王海龍，博士，教授，博士生導(dǎo)師，Email：nndwhl@126.com。