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Synopsis Permeable forms are designed to drain excess water contained in the concrete immediately after their placement. Removal of excess water not only decreases the water-cement ratio of the surface concrete, but increases the density of the concrete, and eventually enhances its durability. However, few studies focus on the characteristics of pore structure, namely, the relationship between changes in the volume and distribution of capillary pore and the durability of concrete by the use of permeable forms. In this study, investigations were made paying attention to changes in pore structure on past data obtained from tests conducted on permeable forms. The data included pore size distribution, cement volume distribution, depth of accelerated neutralization, salt infiltration and surface strength. The investigations led to the following findings: 1) Use of permeable forms decrease the percentage of pore volume, especially that ranging between 50 nm and 2pm. 2) In the case of pore size ranging between 50 nm and 2 pm, correlations can be seen between the decrease in pore volume and such properties as neutralization, chloride ion penetration and surface strength.

Changes in Pore Structure and Enhanced Durability of Concrete by the Use of Permeable Forms