Title:
PFA Concrete: Intrinsic Permeability
Author(s):
R. K. Dhir and E. A. Byars
Publication:
Materials Journal
Volume:
90
Issue:
6
Appears on pages(s):
571-580
Keywords:
cements; mix proportioning; permeability; portland cements; pozzolans; Materials Research
DOI:
10.14359/4432
Date:
11/1/1993
Abstract:
The study, which is part of a major international research program into the durability of concrete incorporating pulverized-fuel ash (PFA) concrete, deals with the effect of PFA on the intrinsic permeability. Permeability measurements were made using both air and water flows. The concrete mixtures, made with ordinary and rapid-hardening portland cements (OPC and RHPC), were designed with 0, 15, and 30 percent (25 percent with RHPC) cement replacement with PFA for equivalent strength of 25, 35, 50, and 60 MPa, with a workability of 75-mm slump. The test specimens were subjected to different curings and tested at the age of 28 and 180 days. Concrete is shown to have progressively lower intrinsic permeability with increasing PFA content. The effect is more marked with water permeability. RHPC/PFA blends perform better than OPC/PFA blends with poor curing.