"A tribute to Theory of Volume Changes in Hardened Portland-Cement Paste during Freezing"""""
"A tribute to Theory of Volume Changes in Hardened Portland-Cement Paste during Freezing"""""
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DOI：
10.14359/20128
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发表时间：
2008-03
期刊：
影响因子：
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通讯作者：
T. Powers;R. Helmuth
中科院分区：
文献类型：
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作者：
T. Powers;R. Helmuth
给出了硬化硅酸盐水泥浆体在有无夹带空气情况下冻结的新实验数据。它们用两种机制解释：(1)当水在毛细管腔中冻结时产生水压；(2)由于凝胶中的水扩散，冰体在毛细管腔或空气孔洞中生长。空隙限制了液压，缩短了空腔中的冰可以增加的时间段。空气空隙彼此越近，它们在控制任何一种机制方面就越有效。/作者/
NEW EXPERIMENTAL DATA ARE PRESENTED ON THE FREEZING OF HARDENED PORTLAND-CEMENT PASTES WITH AND WITHOUT ENTRAINED AIR. THEY ARE EXPLAINED IN TERMS OF TWO MECHANISMS: (1) THE GENERATION OF HYDRAULIC PRESSURE AS WATER FREEZES IN CAPILLARY CAVITIES AND (2) THE GROWTH OF THE BODIES OF ICE IN THE CAPILLARY CAVITIES OR AIR VOIDS BY DIFFUSION OF WATER FROM THE GEL. AIR VOIDS LIMIT THE HYDRAULIC PRESSURE AND SHORTEN THE PERIOD DURING WHICH THE ICE IN THE CAVITIES CAN INCREASE. THE CLOSER THE AIR VOIDS ARE TO EACH OTHER THE MORE EFFECTIVE THEY ARE IN CONTROLLING EITHER MECHANISM. /AUTHOR/