Abstract
The first part of this paper deals with the exploratory studies on low porosity portland cement pastes. The clinker grinding and paste preparation method are those reported in the previous paper in this series (1). With the appropriate kinds and amounts of grinding aid, lignosulfonate, and potassium carbonate excellent workability could be obtained. With different grinding aids, the 1-day compressive strengths of 1 in. cube pastes varied from 300 to 14, 000 psi; the 28-day strengths were between 20, 000 and 29, 700 psi, and the 180-day strengths between 33, 700 and 36, 400 psi. The second part of the paper deals with the dimensional changes of 0.2 water-cement ratio pastes, hydrated at 25°C for 1 day and for 28 days. The low-porosity pastes showed one-third to one-half as large lenght changes as pastes made from the same cement with a water-cement ratio of 0.4, and one-fourth to one-third as large as those made with a water-cement ratio of 0.6.
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