Effects of Two Non-Chloride Accelerating Agents on Setting Characteristics of Portland Cement Mortars

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Title: Effects of Two Non-Chloride Accelerating Agents on Setting Characteristics of Portland Cement Mortars

Author(s): Philip A. Smith

Publication: Special Publication

Volume: 102

Issue:

Appears on pages(s): 25-34

Keywords: accelerating agents; calcium chlorides; calcium nitrates; mortars (material); setting (hardening); sodium thiocyanates; Materials Research

Date: 9/1/1987

Abstract:
Effects of two non-chloride accelerating agents -- sodium thiocyanate and calcium nitrate -- in time to achieve initial set of two brands of Type I cement were determined at 70 F (21 C) and 40 F (4 C). Results with these two non-chloride accelerators were compared with results with calcium chloride, the conventional accelerator. Tests show:Low or moderate dosages of the two non-chloride accelerators can reduce time to achieve initial set by l-2 hr.- Any one of the three accelerators may be more effective with one ce-ment than with another cement having similar setting characteristics without accelerators In general, all three of the accel-erators are more effective at 40 F than at 70 F.