發(fā)布時(shí)間：2018-08-19 07:16

【摘要】：為了研究高溫后高強(qiáng)高性能混凝土的抗爆裂性能,對(duì)摻加0、0.2%聚丙烯纖維的C60高強(qiáng)高性能混凝土進(jìn)行模擬高溫試驗(yàn),測(cè)試高溫后混凝土的超聲參數(shù)及軸心抗壓強(qiáng)度,建立混凝土超聲聲速與受火溫度及軸心抗壓強(qiáng)度的關(guān)系;對(duì)常溫、300、500、700℃分別摻加0、0.2%纖維的高強(qiáng)高性能混凝土進(jìn)行壓汞實(shí)驗(yàn),分析纖維對(duì)混凝土內(nèi)部孔隙影響。結(jié)果表明:隨受火溫度的提高,混凝土高溫?fù)p傷趨于嚴(yán)重,總孔隙率、平均孔徑、宏觀孔所占比例均趨于增大。摻加纖維的有利方面主要體現(xiàn)在纖維受熱熔化,降低了混凝土內(nèi)部的蒸汽壓力,減輕了劣化程度,高溫后摻纖維混凝土比素混凝土超聲聲速、軸心抗壓強(qiáng)度有所提高,平均孔徑、宏觀孔比例較小,一定程度上改善了混凝土的高溫性能。
[Abstract]:In order to study the crack resistance of high strength and high performance concrete (HHPC) after high temperature, the high strength and compressive strength of C60 high strength concrete mixed with 0. 2% polypropylene fiber were tested by simulated high temperature test, and the ultrasonic parameters and axial compressive strength of concrete after high temperature were tested. The relationship between ultrasonic sound velocity of concrete and fire temperature and axial compressive strength was established, and the mercury injection experiment of high strength and high performance concrete mixed with 0 0. 2% fiber at room temperature of 300 500 700 鈩，

本文編號(hào)：2191044