Title:
Landmark Series: Studies of the Physical Properties of Hardened Portland Cement Paste
Author(s):
T.C. Powers and T.L. Brownyard
Publication:
Concrete International
Volume:
25
Issue:
8
Appears on pages(s):
59-70
Keywords:
DOI:
Date:
8/1/2003
Abstract:
In this, the final part of the paper, the concepts concerning the characteristics of hardened paste that have emerged from this study are set down in brief. It is not implied that the concepts are new and unique. On the contrary, they agree in general with previously expressed views of those who have believed the colloidal state of the hydration products to be a dominant characteristic of the hardened paste. However, it is now possible to consider these characteristics in more detail and on a quantitative or semi-quantitative basis. This summary includes only the facts and relationships that can be set down with a minimum of discussion. The reader should not depend on this part alone for an understanding of the subject, since the finer points of interpretation and many significant details and illustrative graphs are omitted. Some of the relationships given below do not appear in the preceding parts of the paper, but they are dkived from relationships already given. In the preceding parts of this paper the sequence of topics was determined according to the requirements for an orderly development of concepts and interrelationships between variables. In this summary it isassumed that the reader is familiar with the background material and the subject is presented, as far as possible, in the form of an analysis of the properties of hardened paste. The following should be noted carefully before proceeding with the summary: All the data and relationships discussed below pertain only to specimens cured continuously at about 70 F. Without modification, they do not apply to other curing conditions.