Durability of Porous Concrete


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Title: Durability of Porous Concrete

Author(s): M. Tamai and M. Yoshida

Publication: Special Publication

Volume: 212


Appears on pages(s): 755-770

Keywords: abrasion resistance; free lime; freezing and thawing; porous concrete

Date: 6/1/2003

This paper presents the results of an investigation undenaken to develop addi- tional data on the chemical and mechanical properties on porous concrete. When immersed in seawater for a period of 360 days, the compressive strength of porous concrete decreased by about 15 to 20% compared with standard curing, due to the leaching of free lime. Abrasion resistance of porous concrete in water showed a slightly lower value compared with that of normal concrete. The dynamic modulus of elasticity shows a steep rise during early periods up to 7 days. This tendency became more noticeable when the binder-voids ratio was decreased. The resistance of porous concrete to freezing and thawing is considered to be low, because porous concrete has continuous voids into which water can permeate during freezing and thawing. Increasing the binder per unit volume of porous concrete increases its durability.