Abstract
An azo calcium lignosulfonate (ACL) is synthesized by the coupling of a diazonium salt made from p‐aminobenzene sulphonic acid and calcium lignosulfonate (CL). The surface activity and foaming ability of ACL are evaluated; also the performances of ACL modified mortars such as fluidity and mechanical strength are investigated. Test results show that ACL has higher surface tension and lower foaming ability compared with CL, the disperse ability of ACL is stronger than that of CL at higher dosage than 0.5%, the flexural and compressive strength of ACL modified mortars are superior to that of CL modified mortars.
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