The study of laminate concrete between geopolymer and conventional

Lamination method on concrete is the combination of two different kinds of concrete namely conventional concrete made of cement as binder and geopolymer concrete by using fly ash. This combination aims to know the setting time happened in the conventional paste as well as the geopolymer paste with similar fas percentage and to obtain the comparison of the compressive strength point of the concrete by using similar mixed design concept. In this study, the variation of the specimens consist of full conventional concrete, full geopolymer concrete, laminated concrete A, laminate concrete B, and laminate concrete C. Based on the result of the study, it can be seen that the concrete was always increase along with the increasing age of the concrete. The higher compressive strength from the five variations of the specimen were on full geopolymer concrete with 362.96 kg/cm 2 as the compressive strength point and the increasing percentage in 14 days was 30.71 % and for 28 days was 47,59%. While on the laminate concrete, the highest compressive strength was on laminate concrete B with the arrangement method of half conventional method and half geopolymer concrete with vertical concrete position. The compressive strength point of the laminate concrete B was 268.15 kg/cm 2 , while for full conventional concrete was 202.96 kg/cm 2 . This conventional concrete was on the fourth composition after full geopolymer concrete, laminate concrete B, and laminate concrete A.