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 北京建筑大學(xué)土木與交通學(xué)院， 北京 100044； 2 北京市建筑設(shè)計(jì)研究院有限公司， 北京 100045）

［摘要］通過(guò)寒冷季節(jié)制作的粉煤灰混凝土棱柱試件的軸心受壓試驗(yàn)，考察了冬季施工的養(yǎng)護(hù)溫度以及棱柱尺寸對(duì)粉煤灰混凝土棱柱受壓性能的相互影響，對(duì)比了外摻粉煤灰混凝土與基準(zhǔn)混凝土的力學(xué)性質(zhì)。試驗(yàn)結(jié)果表明，嚴(yán)寒環(huán)境下低溫養(yǎng)護(hù)對(duì)混凝土抗壓強(qiáng)度和彈性模量的發(fā)展有不利影響；外摻粉煤灰則有利于低溫養(yǎng)護(hù)條件下混凝土的抗壓強(qiáng)度增長(zhǎng)；混凝土的軸心抗壓強(qiáng)度、彈性模量和峰值割線模量均隨試件尺寸的增加而增加，這表明在寒冷季節(jié)澆筑混凝土?xí)r，一定試件尺寸有利于試件保溫，對(duì)混凝土強(qiáng)度發(fā)展有利。

［關(guān)鍵詞］粉煤灰混凝土； 尺寸效應(yīng)； 養(yǎng)護(hù)溫度； 抗壓強(qiáng)度； 變形模量

中圖分類號(hào)：TU375文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)13-0038-06

Experimental study on compressive properties of fly ash concrete prism under  low temperature curing

HE Xixi1, KONG Lingzhao1, ZHOU Sun2

（1 School of Civil and Transportation Engineering， Beijing University of Civil Engineering and Architecture，Beijing 100044, China； 2 Beijing Building Design & Research Institute Co., Ltd.， Beijing 100045， China）

Abstract:Through the axial compression experimental of the fly ash concrete prism specimens produced in the cold season, the mutual influence of the winter construction curing temperature and the prism size on the compressive performance of the fly ash concrete prism was investigated, and the mechanical properties of the mixed fly ash concrete were compared with the mechanical properties of the benchmark concrete. The experimental results show that low temperature curing under severe cold environment has an adverse effect on the development of compressive strength and elastic modulus of concrete; the addition of fly ash is conducive to the growth of compressive strength of concrete under low temperature curing conditions; the axial compressive strength, elastic modulus and peak secant modulus of concrete all increase with the increase of the size of the piece, which shows that a certain size of the piece is conducive to the insulation of the piece and is beneficial to the development of strength of concrete when concrete is poured in the cold season.

Keywords:fly ash concrete； size effect； curing temperature； compressive strength； deformation modulus

作者簡(jiǎn)介：何淅淅，碩士，教授，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email:hexixi@bucea.edu.cn。