도로포장 보수재 활용 가능성 평가를 위한 알칼리 활성 시멘트 모르타르 기초연구

Abstract

PURPOSES : This study is to evaluate the feasibility of using the alkali activated cement concrete for application of partial-depth repair in pavement. METHODS : This study analyzes the compressive strength of alkali activated cement mortar based on the changes in the amount/type/composition of binder(portland cement, fly ash, slag) and activator(NaOH, <TEX>$Na_2SiO_3$</TEX>, <TEX>$Na_2CO_3$</TEX>, <TEX>$Na_2SO_4$</TEX>). The mixture design is divided in case I of adding one kind-activator and case II of adding two kind-activators. RESULTS : The results of case I show that <TEX>$Na_2SO_4$</TEX> based mixture has superior the long-term strength when compared to other mixtures, and that <TEX>$Na_2CO_3$</TEX> based mixture has superior the early strength when compared to other mixtures. But the mixtures of case I is difficult to apply in the material for early-opening-to-traffic, because the strength of all mixtures isn't meet the criterion of traffic-opening. The results of case II show that NaOH-<TEX>$Na_2SiO_3$</TEX> based mixtures has superior the early/long-term strength when compared to NaOH-<TEX>$Na_2SiO_3$</TEX> based mixtures. In particular, the NaOH-<TEX>$Na_2SiO_3$</TEX> based some mixtures turned out to pass the reference strength(1-day) of 21MPa as required for traffic-opening. CONCLUSIONS : With these results, it could be concluded that NaOH-<TEX>$Na_2SiO_3$</TEX> based mixtures can be used as the material of pavement repair.