In the purpose of selecting a concrete most suitable for bonding, three kinds of concrete (ordinary Portland cement, slag cement, and composite Portland cement) were bonded by three binders respectively, and the bonding effect were compared with split tensile strength as the evaluation indicator. Furthermore, the equivalent coefficient β of bonding strength, which is an index of evaluation the strength of bonding between new and old concrete, is proposed for the first time. It is the ratio of splitting tensile strength of a bonded concrete to splitting tensile strength of standard specimen of the concrete. Comparison of β among the three concretes revealed that the bonding effect of three binders on ordinary Portland cement is better than that of the other two, with the 28 d bonding strength reaching 86% of the tensile strength of standard specimen, which suggest that ordinary Portland cement is the most suitable for bonding among the three concretes.
Key words
bonding between new and old concrete /
short age /
binder /
bonding strength /
equivalent coefficient
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References
[1] 袁 群,刘 健.新老混凝土粘结的剪切强度研究[J] .建筑结构学报,2001,22(2):46-50.
[2] 赵志方,赵国藩,黄承逵.新老混凝土粘结的拉剪性能研究[J] .建筑结构学报,1999,20(6):26-31.
[3] 赵志方,赵国藩,黄承逵.新老混凝土粘结的劈拉性能研究[J] .工业建筑,1999,29(11):56-59.
[4] 马朝运,袁 群,李宗坤,等.混凝土冷缝劈裂抗拉强度试验研究[J] .人民黄河,2008,30(6):79-82.
[5] 乔艳静,费治华,田 倩,等.矿渣、粉煤灰掺量对混凝土收缩、开裂性能的研究[J] .raybet体育在线
院报,2008,25(4):90-96.
[6] 黄仕超,彭 刚,邹三兵,等不同龄期混凝土动态力学性能研究[J] .raybet体育在线
院报,2015,32(12):129-133.
[7] 赵志方,赵国藩,刘 健,等.新老混凝土粘结抗拉性能的实验研究[J] .建筑结构学报,2001,22(2):51-56.
[8] 刘 健,赵国藩,新老混凝土粘结收缩性能研究[J] .大连理工大学学报,2001,41(3):339-342.
[9] 李平先,张雷顺,赵国藩.新老混凝土粘结面的抗冻剪切性能试验研究[J] .水利学报,2005,36(3):339-344.
[10] 宋玉普,魏春明.混凝土施工缝接缝面劈拉强度试验研究[J] .沈阳建筑大学学报,2006,22(4):596-599.
[11] 史长城,王大辉,袁 群.短龄期老混凝土与新混凝土粘结的劈拉强度研究[J] .混凝土与水泥制品,2015,5(5):15-18.
[12] SL 352—2006,水工混凝土试验规程[S] .北京:中国水利水电出版社,2006.
[13] JGJ 55—2011,普通混凝土配合比设计规程[S] .北京:中国建筑工业出版社,2011.
[14] 赵志方,周厚贵.新老混凝土粘结机理研究与工程应用[M] .北京:中国水利水电出版社,2003.
[15] WELLS J A, STARK R D, POLYZOIS D. Getting Better Bond in Concrete Overlays[J] . Concrete International, 1999, 21(3): 49-52.
[16] 丁俊杰.固结剂对水泥稳定强度的影响[D] .大连:大连理工大学,2014.
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