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

（1 寧波大學(xué)科學(xué)技術(shù)學(xué)院, 寧波 315211； 2 寧波大學(xué)建筑工程與環(huán)境學(xué)院， 寧波 315211）

［摘要］試驗(yàn)首先對(duì)無(wú)纖維、塑鋼纖維（HPPF）和聚丙烯腈纖維（PANF）三組陶粒混凝土進(jìn)行凍融循環(huán)作用，然后分20，200，400，600，800℃五個(gè)溫度水平進(jìn)行高溫作用，研究受凍融影響高溫作用下，未摻纖維和摻入不同纖維的陶粒混凝土力學(xué)性能變化規(guī)律。試驗(yàn)結(jié)果表明：纖維的摻入能夠?qū)μ樟；炷林辛芽p的產(chǎn)生和擴(kuò)展起到一定阻止作用，使陶粒混凝土的抗凍性能得到改善，有效緩解混凝土脆性破壞特征；未經(jīng)凍融作用時(shí)，摻入HPPF，PANF后，在20～400℃范圍內(nèi)，陶粒混凝土的立方體殘余抗壓強(qiáng)度均高于無(wú)纖維摻入的陶?；炷粒?0～200℃范圍內(nèi)，可明顯地提高陶?；炷恋臍堄嗯芽估瓘?qiáng)度；凍融循環(huán)作用后，無(wú)纖維陶?；炷恋臍堄嗫箟簭?qiáng)度和殘余劈裂抗拉強(qiáng)度都明顯高于其他二者；凍融循環(huán)作用后，在20～400℃三組陶?；炷恋睦庵w殘余抗壓強(qiáng)度值明顯減小。

［關(guān)鍵詞］纖維陶粒混凝土； 凍融循環(huán)； 高溫； 力學(xué)性能

中圖分類號(hào)：TU375文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2018)18-0074-05

Experiment study on the mechanical performance of fiber ceramisite concrete subjected to freeze-thaw after elevated temperature

Pang Jiaxian1, Wang Yiming2, Huang Jing2, Liu Anqing2, Wang Jianmin2

(1 College of Science & Technology Ningbo University， Ningbo 315211, China; 2 Faculty of Architectural, Civil Engineering and Environment, Ningbo University, Ningbo 315211, China)

Abstract:To study the variation of mechanical performance of different fiber ceramisite concrete after freeze-thaw cycle and high temperature, tests were conducted on three groups of specimens under five temperature levels（200℃, 400℃, 600℃ and 800℃）. The three groups are ceramisite concrete without fiber, with plastic steel fiber(HPPF) and with polyacrylonitrile fiber(PANF).The results indicates that the incorporation of fibers can prevent the generation and expansion of cracks in ceramsite concrete, and it could improve frost resistance and alleviate the brittle fracture characteristics effectively. Before the freeze-thaw effect, the cubic residual compressive strength of ceramsite concrete was improved by the incorporation of fibers in the range of temperature from 20℃ to 400℃ and the residual splitting tensile strength was improved in the range of temperature from 20℃ to 200℃. After the freeze-thaw cycle effect, the residual compressive strength and residual tensile strength of fiber-free ceramsite concrete are significantly higher than the other two. After the freeze-thaw cycle effect, the prismatic residual compressive strength values of the three groups of ceramsite concrete at temperature from 20℃ to 400℃ were significantly reduced.

Keywords:fiber ceramsite concrete; freezethaw cycle; elevated temperature; mechanical performance

*國(guó)家自然科學(xué)基金（51878360），省自然科學(xué)基金（LY18E080008），省公益技術(shù)應(yīng)用社會(huì)發(fā)展項(xiàng)目（LGF18E080007）。

通訊作者：王建民, 博士，副教授，Email: wangjianmin@nbu.edu.cn。