Susilorini, Retno and Nikodemus, - and Setiwan, Budi and GANIS, ROBERT INDARKO and Hartaman, Aris nugraha (2009) The Early Age Performance of Concrete with Natural Retarder. Prosiding Seminar Nasional KONTEKS 3 Kemajuan Teknologi dan Implementasinya dalam Rekayasa Sipil dan Lingkungan. pp. 219-226. ISSN 78-979-15429-3-7

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Abstract

An effort have been done to achieve green concrete, it is using natural retarder. It is believed that sugar based admixture can also improve concrete performance. Sugar based retarder is important admixture to reduce time setting and also to retard concrete hardening. This research wants to investigate the performance of early concrete which is using natural retarder, that are sugar and sugar cane liquid with dosage of 0.03% of cement weight. This research conducts experimental method. The experiment uses cylinder and mortar cubes specimens. Those specimens are tested after 7 and 14 days curing. The variant of specimens is divided into plain, added by sugar 0.03% of cement weight, and added by sugar cane liquid 0.03% of cement weight. The compressive strength design is 30 MPa. The experiment also conducts an observation of mortar surface hardening by trinoculer electronic microscope. This research meets conclusions: (1) Cement with sugar 0.03% of cement weight has the highest value of penetration at final set and has proven more effective in prohibiting the hardening of cement paste; (2) The experimental results describe that sugar 0.03% of cement weight is giving sharp increase (87.27%) and also the highest value of mortar compressive strength at days-14. The hydration calcium silicates in mortar have been retarded by the presence of both sugar and also sugar cane liquid at early stages; (3) Retarding effect of concrete specimen’s with sugar 0.03% of cement weight and sugar cane liquid 0.03% of cement weight works at days-7 and days-14 that they have lower compressive strength compared to plain concrete specimen; (4) The mortar hardening is affected seriously by the presence of sugar 0.03% of cement weight and sugar cane liquid 0.03% of cement weight; and (5) The natural retarders of sugar and sugar cane liquid can significantly promotes good performance of early age concrete.

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