- 摘 要
-
(1 中原工學院建筑工程學院，鄭州 450007；2 鄭州大學土木工程學院，鄭州 450002)
［摘要］為較精確得到預拌混凝土早期極限拉應變，利用自行設計制作的軸心抗拉試驗裝置解決了試件對中困難的問題。對工程中常用的3個強度等級（C20，C40，C60）的混凝土進行4個齡期（3，7，14，28d）的試驗研究。研究得出了預拌混凝土早期極限拉應變，并和已有數(shù)據(jù)進行對比分析；擬合出預拌混凝土早期極限拉應變隨齡期的變化規(guī)律；得到預拌混凝土早期極限拉應變和立方體抗壓、軸心抗拉強度以及抗拉彈性模量的關系。利用文中公式可估算出預拌混凝土早期極限拉應變，為有關技術人員和混凝土規(guī)范中關于耐久性的修訂提供參考。
［關鍵詞］預拌混凝土; 極限拉應變; 早期
中圖分類號：TU528.01 文獻標識碼：A 文章編號：1002-848X(2014)11-0090-04
Experimental research on the ultimate tensile strain of premixed concrete at early-age
Li Xiaofen1, Chen Meng2, Liu Lixin2
(1 School of Architectural Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China; 2 School of Civil Engineering, Zhengzhou University, Zhengzhou 450002, China)
Abstract: To get the precise tensile strain of premixed concrete at early-age, the difficulty of specimen centering was solved by the self-designed axial tension experimental apparatus. The experiment was performed on three different strength grades concrete of C20, C40 and C60 at four ages of 3, 7, 14 and 28 days. The ultimate tensile strain at early-age of the premixed concrete was obtained and compared with the existing data. The change relationship of ultimate tensile strain at early-age with the ages was obtained. The relationships between the ultimate tensile strain of the premixed concrete at early-age and the cube compressive strength, axial tensile strength and tensile elastic modulus were proposed. The ultimate tensile strain at early-age of premixed concrete can be estimated by the proposed formula, providing reference for the related engineers and the revision about the durability in concrete standards.
Keywords: premixed concrete; ultimate tensile strain; early-age
* 河南省高等學校青年骨干教師資助項目。
作者簡介：李曉芬，碩士，講師，Email：li_xiaofen2010@163.com。
參考文獻
［1］劉數(shù)華，方坤河. 混凝土的極限拉伸值研究綜述［J］.福建建材，2007,1(2)：14-17.
［2］葉列平.混凝土結(jié)構［M］. 北京：清華大學出版社，2007.
［3］周士瓊.普通混凝土受拉性能的試驗研究［J］.中國公路學報，1994,2(7)：15-20.
［4］陳萌，劉立新，彭少民.預拌混凝土各齡期抗拉和抗壓強度換算關系試驗研究［J］.建筑結(jié)構，2010,40(2)：109-111.
［5］閆亞楠.骨料品種對混凝土力學及變形性能的影響［D］.南京：南京航空航天大學，2008.
