Effect of Sea Water on Frost Damage to Mortar and Cement Paste

X. Wang, K. Ayuta
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引用次数: 1

Abstract

Serious deterioration of concrete usually occurs under the influence of both sea water and frost action in cold regions. In order to clarify the connection between pore structure and frost behavior of concrete surface as affected by sea water and freezing-thawing action, three series were carried out using small mortar and cement paste specimens. The first one was to investigate the effects of sea water on pore structure by means of mercury-intrusion porosity meter; the second one was to investigate the effects of sea water on products by means of X-ray diffraction; and the last one was to investigate the effects of sea water on freezable water by means of differential scanning calorimetry. Results obtained show that specimens immersed in sea water have many pores ranging in size of several hundred nm to thousand nm, and contain much more freezable water than those immersed in fresh water. When concrete is affected by both sea water and freezing and thawing action, the number of medium-size pores (100 nm to 1000 nm) and the amount of freezable water increase. There is good correlation between the total pore volume and the amount of freezable water. Accordingly, it is considered that marine concrete in cold regions deteriorates because the pore structure near the exposure surface becomes more porous and the amount of freezable water increases.
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海水对砂浆和水泥浆冻损的影响
在寒冷地区,混凝土在海水和霜冻共同作用下往往会发生严重的劣化。为了弄清海水和冻融作用下混凝土表面孔隙结构与结霜行为之间的关系,采用小型砂浆和水泥浆试件进行了三个系列的试验研究。首先利用汞侵入孔隙度仪研究海水对孔隙结构的影响;二是用x射线衍射法研究海水对产品的影响;最后用差示扫描量热法研究了海水对可冻水的影响。结果表明,浸泡在海水中的试样具有许多几百~几千nm大小的孔隙,并且含有比浸泡在淡水中的试样多得多的可冻水。在海水和冻融作用共同作用下,混凝土中孔径(100 ~ 1000 nm)和可冻水量增加。总孔隙体积与可冻水量之间存在较好的相关性。因此,可以认为寒冷地区海工混凝土的劣化是由于暴露面附近的孔隙结构变得更多孔,可冻水量增加。
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