It was pointed out that the strength of molding sand and compactness of sand mold is the key factors influencing the rigidity of green sand mold under normal temperature.
指出型砂强度和砂型的紧实程度是常温下影响湿砂型刚度的主要因素。
Phosphogypsum can be used as a sulphate activator for the lime and fly ash system, but this system sets slowly and its early compressive strength is not high under the normal temperature.
石灰、粉煤灰胶结体系中，可用磷石膏作粉煤灰的硫酸盐激发剂，但该系统在常温下凝结较慢，早强不高。
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