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Title: Effect of Phosphate-Based Compound on the Hydration of Cement and Cement components

Author(s): V. S. Ramachandran and M. S. Lowry

Publication: Symposium Paper

Volume: 148

Issue:

Appears on pages(s): 131-152

Keywords: admixtures; calcium aluminates; calcium silicates; calorimeters; cements; gypsum; hydration; portland cements; Materials Research

DOI: 10.14359/4105

Date: 9/1/1994

Abstract:
The influence of a phosphonate-based admixture called aminotri (methylene phosphonic acid) (ATMP) on the hydration of C 3A, C 3A and 25 percent gypsum, and C 3S and Type I cements (normal, high-alkali, and low-alkali) was evaluated. Isothermal conduction calorimetric investigations of various mixes containing 0.03 to 0.05 percent of phosphonic acid, at water-cement ratios of 0.35 and 1.0, were carried out up to 72 hr. The ATMP acted as a super-retarder for all mixes studied. At a dosage of only 0.05, the exothermal effect for one of the high-alkali Type I cements was delayed by about 16 hr. The hydration of C 3A and C 3S was also retarded by about 40 to 45 min and more than 50 hr, respectively, at a dosage of 0.05 percent. In the C 3A and gypsum system, the third peak corresponding to the reaction of C 3A with ettringite was extended by about 8 to 9 hr.