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沙坝
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====建造沙坝（以及翼墙）====
'''对于水泥的总体建议'''：A common cause of cracks in structures and linings (e.g. in tanks, dams, waterways, wells) is errors in mixing and applying the cement. First of all, it is important that only pure ingredients are used: clean water, clean sand, clean rocks. The materials have to be mixed very thoroughly. Secondly, the amount of water during mixing needs to minimal: the concrete or cement needs to be just workable, on the dry side even, and not fluid. Thirdly, it is essential that during curing the cement or concrete is kept moist at all times, for at least a week. Structures should be covered with plastic, large leaves or other materials during the curing period, and kept wet regularly. 建筑物产生裂缝（如，水槽、坝体、排水沟、井）的普遍原因是水泥混合和施用不当造成的。首先，只用纯净原料（干净的水、沙、石头），这一点至关重要。原料必须充分混合。第二，混合时需要的水量极小：混凝土或水泥能用即可，不稀且较干。第三，在固化过程中，水泥或混凝土至少一周都必须保持水分。在固化过程中，建筑物应该由塑料、大树叶或其它材料加以覆盖，保持水分。：建筑物和内里产生裂缝（如，水槽、坝体、排水沟、井）的普遍原因是水泥混合和施用不当造成的。首先，只用纯净原料（干净的水、沙、石头），这一点至关重要。原料必须充分混合。第二，混合时需要的水量极小：混凝土或水泥的湿度要恰到好处，不稀且较干。第三，在固化过程中，水泥或混凝土至少一周都必须保持水分。在固化过程中，建筑物应该由塑料、大树叶或其它材料加以覆盖，并定期保持水分。
'''具体建议'''
