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查了一下，这个叫Calthemite Stalactites (钙长石钟乳石 )
是水分在水泥里面渗漏导致把一些钙物质带出来，和空气接触后形成的碳酸钙，总结下来就是渗水
Calthemites is concrete, mortar or lime-derived secondary deposits consisting primarily of calcium carbonate that grow on or under, man-made alkaline structures, such as concrete, and mimic the shapes and forms of cave speleothems, such as stalactites.
Any water that finds a seepage path through cracks and air voids present in concrete will readily carry minerals such as calcium hydroxide and calcium ion to the underside of the structure.
When the leachate solution makes contact with the carbon dioxide in the air, it causes a chemical reaction, which deposits calcium carbonate on the outside of the concrete structure.
Other trace elements such as iron from rusting reinforcing may be transported and deposited by the leachate at the same time as the calcium carbonate. This may give the calthemites an orange or red tint.
The sight of calthemite is a visual sign that calcium is being leached from the concrete structure and may indicate that the concrete is gradually degrading. |
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踏上养金毛的快乐之路 (2017-9-23) sandyben 
发表于 2021-2-20 19:57
