木钙（木质素磺酸钙）是一种多组分高分子聚合物阴离子表面活性剂，外观为棕黄色粉末物质，略有芳香气味，分子量一般在800－10000之间，具有很强的分散性、粘结性、螯合性。
在延迟成型时间较长时，SRA起到的缓凝作用比木钙更明显。
The SRA has better effect than lignosulphonate calcium as the forming retarded time is longer.
采用化学处理方法，对木钙进行改性，对松香进行皂化，并与表面活性剂进行复合。
Adopt the chemical method, carry on the saponification to the lignin sulfonic acid calcium, and compound with the surface-active agent.
论文分别研究了木钙、糖钙、酒石酸、焦磷酸钠和蔗糖共五种常用缓凝剂对水泥净浆凝结时间、混凝土凝结时间及强度的影响。
The effects of five common set-retarders on setting time of cement paste and concrete and strength of concrete are studied.
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