Durability and Compressive Strength of Mae Moh-Fly Ash Mortar

Abstract

Objectives of this research were to investigate the carbonation resistance, autogenous shrinkage, drying shrinkage and compressive strength of mortar containing lignite fly ash from Mae Moh. The water-cementitious materials ratio was kept constant. The main parameter was the percentage of fly ash replacements, 30% and 60%. For carbonation, autogenous shrinkage and drying shrinkage tests, the specimens were made with the replacements of only one type of fly ash whereas for compressive strength test, 3 types of fly ash in different content of SO₃ were used.The test results indicated that when percentage of fly ash replacement increased, both types of shrinkage decreased. However, increasing in fly ash replacement ratio should be observed in the lowering of carbonation resistance the carbonation resistance. For the compressive strength result,the strength of fly ash mortar was related to the CaO-Equivalent in cementitious materials.