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锅台用水泥砂浆抹面,光洁平滑,但往往烧火不几天便出现裂缝,裂缝首先从灶口、火道等抹灰面狭小、加热量大的地方出现。而且由细变粗,发展很快,原因是水泥砂浆中的砂受热到一定程度后体积要发生膨胀,温度降低之后,体积又收缩一胀一缩,抹灰层便极易产生裂缝。有些锅台抹后不几天便要烧用,这时水泥砂浆的强度低,而且主要是含水量大,烧火加温后,砂浆会因迅速丧失水份而速干,
The pots and pans are smoothed with cement mortar, smooth and smooth, but cracks often occur within a few days. The cracks first appear from narrow areas of the plastering surface such as stoves and fires, and large amounts of heating. Moreover, it becomes fine and coarse, and it develops rapidly. The reason is that the volume of the sand in the cement mortar will expand when it is heated to a certain extent. After the temperature is reduced, the volume shrinks and expands and shrinks, and the plaster layer is prone to cracks. Some pots are burned after being wiped for a few days. At this time, the strength of the cement mortar is low, and the main reason is that the moisture content is large. After the fire is warmed up, the mortar will dry quickly due to the rapid loss of water.