Abstract
Phenol resin-high alumina cement composite, a high flexural strength cement based material is investigated here in view of its durability. It showed satisfactory durability performance for one year in water at 20 °C and outdoor exposure. High durability is the specific property of high alumina cement—phenol resin composite but not of other cement/phenol resin composites or other fillers/phenol resin combinations. The strength loss after immersion in water at 20 °C for one year is only 9%, and the elastic modulus remains almost unchanged. Linear expansion and weight increase of high alumina cement—phenol resin composite are 0.12% and 0.82%, respectively, under the same immersion condition. However, this composite contains a large amount of unhydrated cement because basic hardening takes place with a very small quantity of water which is released from the phenol resin during the polycondensation reaction to form a crosslinking structure. The present paper discusses the influence of unhydrated cement particles on durability based on the results of several immersion tests and some other experiments and suggests a method (“immunization”) to improve the stability of the material.
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