Pore size distribution of OPC and SRPC mortars in presence of chlorides

Journal Article · Sat Jul 01 00:00:00 EDT 1995 · Cement and Concrete Research

DOI:https://doi.org/10.1016/0008-8846(95)00093-R· OSTI ID:99590

Suryavanshi, A K; Scantlebury, J D; Lyon, S B ^[1]

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1. UMIST, Manchester (United Kingdom). Corrosion and Protection Centre

The pore structure of chloride-free ordinary portland cement (OPC) and sulphate resistant portland cement (SRPC) mortars are compared with the corresponding mortars with NaCl and CaCl{sub 2} added during mixing. In both OPC and SRPC mortars the addition of chlorides reduced the total accessible pore volumes compared to the corresponding chloride-free mortars. Also, in the presence of chlorides, the number of coarse pores were increased. These changes in the pore structure are believed to be due to dense calcium silicate hydrate (C-S-H) gel morphology formed in the presence of chlorides. The SRPC showed greater changes in pore structures than the OPC with equivalent amounts of chlorides added. This may be due to the lower chloride binding capacity of the SRPC and hence the higher availability of free chlorides to modify the gel morphology.

• OSTI ID: 99590
• Journal Information: Cement and Concrete Research, Vol. 25, Issue 5; Other Information: PBD: Jul 1995
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
MORTARS
PORE STRUCTURE
PORTLAND CEMENT
SODIUM CHLORIDES
CALCIUM CHLORIDES
ADDITIVES
MORPHOLOGICAL CHANGES
REINFORCED CONCRETE
PERMEABILITY
CORROSION RESISTANCE