CURING EFFECTS OF EXPANSION AND MECHANICAL BEHAVIOR OF EXPANSIVE CEMENT CONCRETE
CURING EFFECTS OF EXPANSION AND MECHANICAL BEHAVIOR OF EXPANSIVE CEMENT CONCRETE
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膨胀水泥混凝土的膨胀养护效果和力学性能
DOI：
10.14359/7545
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发表时间：
1967
期刊：
影响因子：
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通讯作者：
V. Bertero
中科院分区：
文献类型：
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作者：
V. Bertero
报告了对单轴约束棱柱形膨胀水泥混凝土试件的两次研究结果。目的是了解养护龄期和水养护延迟如何影响膨胀混凝土的膨胀和机械性能。膨胀水泥混凝土的机械特性受养护龄期的影响似乎与传统混凝土不同。结果表明，一定年龄后，强度和刚度会显着下降。这种下降的主要原因似乎是 12 天后发生的大幅横向扩张。结果还表明，所使用的混凝土混合物的初始膨胀力很大程度上受到膨胀部件的使用年限的影响。固化过程中纵向和横向膨胀的历史，以及混凝土在压缩试验过程中的应力应变关系表明，通过延迟水固化，纵向和横向膨胀会在 24 小时前停止，最终纵向和横向的损失膨胀量小，抗压强度不受影响，但刚度降低。 /作者/
THE RESULTS OBTAINED IN TWO INVESTIGATIONS ON UNIAXIALLY RESTRAINED PRISMATIC EXPANSIVE CEMENT CONCRETE SPECIMENS ARE REPORTED. THE OBJECT WAS TO FIND OUT HOW THE EXPANSION AND MECHANICAL BEHAVIOR OF EXPANSIVE CONCRETE ARE AFFECTED BY CURING AGE AND BY DELAY IN WATER CURING. THE MECHANICAL CHARACTERISTICS OF EXPANSIVE CEMENT CONCRETE APPEAR TO BE AFFECTED BY THE CURING AGE IN A MANNER DIFFERENT FROM THAT EXPERIENCED WITH CONVENTIONAL CONCRETE. RESULTS SHOW THAT THERE IS A CONSIDERABLE DROP IN STRENGTH AND STIFFNESS AFTER A CERTAIN AGE. THE MAIN REASON FOR THIS DROP APPEARS TO BE THE LARGE TRANSVERSE EXPANSION THAT OCCURS AFTER 12 DAYS. RESULTS ALSO INDICATE THAT THE INITIAL POWER OF EXPANSION OF THE CONCRETE MIX USED IS CONSIDERABLY AFFECTED BY THE AGE OF THE EXPANSIVE COMPONENT. HISTORIES OF LONGITUDINAL AND TRANSVERSE EXPANSION DURING CURING, AS WELL AS STRESS-STRAIN RELATIONSHIP OF CONCRETE DURING COMPRESSIVE TESTS, INDICATE THAT BY DELAYING WATER CURING LONGITUDINAL AND TRANSVERSE EXPANSION STOPS BY 24 HR, LOSS IN FINAL LONGITUDINAL AND TRANSVERSE EXPANSION IS SMALL, AND COMPRESSIVE STRENGTH IS NOT AFFECTED, BUT STIFFNESS IS REDUCED. /AUTHOR/