發(fā)布時(shí)間：2018-05-15 22:11

  本文選題：SHCC + 應(yīng)變硬化　； 參考：《河南理工大學(xué)學(xué)報(bào)(自然科學(xué)版)》2017年01期

【摘要】：為研究養(yǎng)護(hù)環(huán)境對(duì)應(yīng)變硬化水泥基復(fù)合材料(strain hardening cementitious composite,SHCC)拉伸性能的影響,采用單軸拉伸試驗(yàn)對(duì)標(biāo)準(zhǔn)、室內(nèi)和室外等3種環(huán)境下的SHCC進(jìn)行了試驗(yàn)研究,獲得了不同情況下的應(yīng)力-應(yīng)變曲線及相關(guān)參數(shù)。試驗(yàn)結(jié)果表明,在養(yǎng)護(hù)充分的情況下,不同環(huán)境條件下的SHCC材料均可表現(xiàn)出顯著的應(yīng)變硬化特征,極限拉應(yīng)變能夠達(dá)到3%以上,且具有良好的裂縫控制能力,極限應(yīng)變下對(duì)應(yīng)的平均裂縫寬度可以控制在125μm以內(nèi);與標(biāo)準(zhǔn)環(huán)境相比,室內(nèi)環(huán)境下SHCC材料的強(qiáng)度有所降低,硬化現(xiàn)象不夠顯著,但其韌性沒有降低,裂縫寬度能夠控制在60μm以內(nèi);室外環(huán)境雖然較為復(fù)雜,但早期的充分養(yǎng)護(hù)能夠使其保持性能穩(wěn)定,抗拉強(qiáng)度和韌性沒有出現(xiàn)明顯下降,裂縫寬度可控制在80μm以內(nèi)。采用引入名義初裂強(qiáng)度和名義初裂應(yīng)變的雙線性簡(jiǎn)化模型能夠較好地描述不同環(huán)境下SHCC單軸拉伸應(yīng)力-應(yīng)變關(guān)系。研究成果表明,合適的養(yǎng)護(hù)環(huán)境下SHCC拉伸性能相對(duì)穩(wěn)定,能夠滿足工程應(yīng)用的要求。
[Abstract]:In order to study the effect of curing environment on the tensile properties of strain hardening cement matrix composites strain hardening cementitious compositeSHCC, uniaxial tensile tests were used to study the SHCC in standard, indoor and outdoor environments. The stress-strain curves and related parameters were obtained under different conditions. The test results show that under the condition of sufficient maintenance, the SHCC materials under different environmental conditions can exhibit remarkable strain-hardening characteristics, the ultimate tensile strain can reach more than 3%, and the SHCC material has good crack control ability. The average crack width under the limit strain can be controlled within 125 渭 m. Compared with the standard environment, the strength of SHCC materials in indoor environment is decreased, the hardening phenomenon is not significant enough, but its toughness is not reduced. The crack width can be controlled within 60 渭 m, while the outdoor environment is more complex, but the early sufficient maintenance can keep its performance stable, the tensile strength and toughness do not decrease obviously, and the crack width can be controlled within 80 渭 m. The simplified bilinear model with nominal initial crack strength and nominal initial crack strain can be used to describe the uniaxial stress-strain relationship of SHCC in different environments. The results show that the tensile properties of SHCC under proper curing environment are relatively stable and can meet the requirements of engineering application.
【作者單位】： 河南理工大學(xué)土木工程學(xué)院;華升建設(shè)集團(tuán);
【基金】：國(guó)家自然科學(xué)基金青年項(xiàng)目(51208183) 河南理工大學(xué)博士基金資助項(xiàng)目(B2014-063)
【分類號(hào)】：TU528

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