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(1 防災(zāi)科技學(xué)院中國(guó)地震局建筑物破壞機(jī)理與防御重點(diǎn)實(shí)驗(yàn)室, 北京 101601; 2 燕京理工學(xué)院建筑學(xué)院, 三河 065201)

摘要: 混凝土材料的宏觀力學(xué)行為及尺寸效應(yīng)受細(xì)觀組分控制,為研究骨料粒徑對(duì)混凝土劈裂抗拉力學(xué)性能及尺寸效應(yīng)的影響機(jī)理,開(kāi)展骨料最大粒徑 10、20、30、40mm,邊長(zhǎng) 150、250、350mm,36 個(gè)立方體試件劈裂抗拉試驗(yàn),并采用 Weibull 統(tǒng)計(jì)尺寸效應(yīng)理論進(jìn)行驗(yàn)證分析。 研究結(jié)果表明:隨著骨料粒徑的增大,劈裂破壞路徑越為曲折;混凝土劈裂抗拉強(qiáng)度尺寸效應(yīng)受骨料粒徑影響,小骨料試件的尺寸效應(yīng)更顯著;尺寸效應(yīng)試驗(yàn)結(jié)果與 Weibull 統(tǒng)計(jì)尺寸效應(yīng)理論相吻合,骨料最大粒徑 10、20、30、40mm 的混凝土劈裂抗拉強(qiáng)度尺寸效應(yīng)對(duì)應(yīng)的臨界邊長(zhǎng)分別為332、287、270、262mm。

關(guān)鍵詞: 骨料粒徑; 混凝土; 劈裂抗拉強(qiáng)度; 尺寸效應(yīng); Weibull 統(tǒng)計(jì)尺寸效應(yīng)理論

中圖分類號(hào):TU528 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2022)13-0128-05

DOI:10. 19701 / j. jzjg. 20200949

Experimental study on the effect of aggregate size on the size effect of concrete splitting tensile strength

DU Min1, CHEN Fanhong2, WANG Suli1

(1 Key Laboratory of Building Collapse Mechanism and Disaster Prevention, China Earthquake Administration,Institute of Disaster-prevention, Beijing 101601, China; 2 Department of Architecture, Yanching Institute ofTechnology, Sanhe 065201, China)

Abstract: The macro mechanical properties and size effect of concrete are affected by mesoscopic components. In order to study the influence mechanism of aggregate particle size on the tensile mechanical properties and size effect of concrete splitting, the splitting tensile test of 36 cube specimens with maximum aggregate particle size of 10, 20, 30, and 40 mm and side lengths of 150, 250, and 350 mm was carried out. Weibull size effect law was adopted to analyze the test data. The results show that the splitting failure path becomes more tortuous with the increase of aggregate size. The size effect of concrete splitting tensile strength is affected by aggregates size, and the size effect of small aggregate specimens is more significant. The size effect test data were fit well with the Weibull size effect law. The critical side lengths corresponding to the size effect of the concrete splitting tensile strength with a maximum aggregate particle size of 10, 20, 30, and 40 mm are 332, 287, 270, and 262 mm, respectively.

Keywords:aggregate size; concrete; splitting tensile strength; size effect; Weibull size effect law