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（上海大學(xué)土木工程系， 上海 200444）

［摘要］徐變函數(shù)的精確與否直接影響到混凝土徐變應(yīng)力和變形等計(jì)算結(jié)果的精度。為修正徐變度冪指數(shù)函數(shù)表達(dá)式存在的待定系數(shù)多、計(jì)算工作量大等不足，依托試驗(yàn)數(shù)據(jù)，提出了對(duì)數(shù)函數(shù)表達(dá)式，可較方便地求解擬合公式中的各系數(shù)，計(jì)算精度能夠滿足工程要求；同時(shí)以粉煤灰、水膠比為試驗(yàn)變量，研究了兩者對(duì)高性能混凝土徐變性能的影響，引入徐變度影響系數(shù)以綜合反映粉煤灰摻量、水膠比以及加載齡期的影響程度。分析結(jié)果表明，計(jì)算值與實(shí)測(cè)結(jié)果較為吻合，徐變度影響系數(shù)可應(yīng)用于摻粉煤灰混凝土的徐變預(yù)測(cè)模型。

［關(guān)鍵詞］高強(qiáng)混凝土； 徐變度； 水膠比； 粉煤灰

中圖分類號(hào)：TU528-31文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)03-0081-04

Experimental analysis and calculation research on influence of fly ash on creep performance of high strength concrete

Jiang Ding， Li Dong

（Department of Civil Engineering， Shanghai University， Shanghai 200444， China）

Abstract:The accuracy of the creep function directly affects the accuracy of calculation results such as creep stress and deformation of concrete. In order to correct the deficiencies in the expression of the exponential function of the creep degree, such as the large number of undetermined coefficients and large calculation workload, a logarithmic function expression was proposed based on the experimental data to easily solve the coefficients in the fitting formula. The calculation accuracy met the engineering requirements. At the same time, the effects of fly ash and water-binder ratio on the creep performance of high-performance concrete were studied. The influence coefficient of creep degree was introduced to comprehensively reflect the effects of amount of fly ash, water-binder ratio and loading age. The analysis results show that the calculated values are in good agreement with the measured results, and the creep degree coefficient can be applied to the creep prediction model of fly ash concrete.

Keywords:high strength concrete; creep degree; water-binder ratio; fly ash

通訊作者：李東，博士，副教授，碩士生導(dǎo)師，Email:lidongbibo@163.com。