VOL. 13, NO. 13, JULY 2018 ISSN 1819-6608 ARPN Journal of Engineering and Applied Sciences ©2006-2018 Asian Research Publishing Network (ARPN). All rights reserved. www.arpnjournals.com 4057 THE SELF COMPACTING CONCRETE (SCC) USING SEAWATER AS MIXING WATER WITHOUT CURING Erniati Bachtiar Departmentof Civil Engineering, Faculty of Engineering, Fajar University, Makassar, Indonesia E-Mail: erni_nurzaman@yahoo.com ABSTRACT The number of problems found in the construction world include the difficulty or lack of fresh water in some areas to be mixed in the concrete, negligence in the maintenance of concrete and working process of concrete mainly on the concrete structures have a complex reinforcement and high concrete building structures. This study aims to find out the compressive strength, splitting tensile strength, absorption, and porosity of Self Compacting Concrete (SCC) using sea water as mixing water and with or without curing in sea water. The test specimens were made for each test specimen with the variation on age 1 day, 3 days, 7 days, 28 days and 90 days. The test method of compressive strength according to ASTM 39/C 39M-12a standard, tensile strength according to ASTM C496 / C496M-11 standard and the porosity and absorption according to ASTM C642-13 standard. The result of research was 1) the decrease in compressive strength in the specimen SCC-SWC was from 3 days, 7 days, 28 days and 90 days consecutive 13.20%, 12.90%, 12.80%, and 12.50%; 2) the decreases in splitting tensile strength in the specimen SCC-SWC were from the age of 3 days, 7 days, 28 days until the age of 90 days consecutive by 3.10%, 8.05%, 9.51%, and 9.21%; 3) the increase in the porosity values on the specimen SCC seawater without cured in sea water (SCC-SWC) at age 3 days, 7 days, 28 days and 90 days was 2.86%, 7.90%, 5.86%, and 5.55%, respectively; 4) the increase in the absorption values on the specimen SCC without curing at 3 days, 7 days, 28 days and 90 days was 15.80%, 20.57%, 15.84%, and 30.80%, respectively. The increase in mechanical properties (compressive strength and tensile strength) in the both of the specimen SCC-SC and SCC-SWC along with the decrease of porosity and absorption. Conversely, the decrease of compressive strength and tensile strength in the both of the specimen SCC-SC and SCC-SWC along with the increase in porosity and absorption value in the SCC. Keyword: SCC, seawater, curing, compressive strength, splitting tensile strength, absorption, porosity. 1. INTRODUCTION The development of today's concrete technology is very rapid. The innovative research was done by researchers to get something new as an effort to improve the quality of concrete emerging. The researchers have done many researchs to answer the problems that arise from the use of materials in concrete mixing and overcome the constraints that often occur to the implementation of work in the field. The problems found in the construction world are the difficult areas of clean water to be used as concrete mixing water, concrete workability, and concrete work processes, especially concrete structures that have complex reinforcement, high concrete structure, and negligence in the maintenance of concrete. Skilled workers needed for requires the adequate compaction in the creation of durable concrete structures. However, the reduction quantity of skilled workers in Japan's construction industry has led to a similar reduction in the quality of construction work. One solution for the performance of concrete structures durable depends on the quality of construction work is the implementation of self- compacting concrete (SCC). The SCC can be compacted into every corner of a formwork purely by its own weight and without the need for vibrating compaction (Okamura and Ouchi, 2003)[10]. The SCC concrete can flow with its own weight, than it easier to work on concrete especially on structures using complex reinforcement, and so that SCC fresh can flow and fill every empty space of the mold(EFNARC, 2005)[5]. Fresh Concrete SCC has the high fluidity that can flow and fill the spaces in the mold with little or no vibration process and reduce the compaction process time then to high fluidity that fresh concrete can be lifted and carried easily through the pump to a high level on the mount flooring as well as on structures that have very solid reinforcement (Okamura and Ouchi, 2003). Otsuki et al. (2012), explain in the paper that the mixing of sea water on concrete using Blast-Furnace Slag Cement (BFS) produces Friedel’s salt and total pore volume decreased as well as increased strength compared with fresh water [11]. Research conducted by Erniati (2014, 2015a) on SCC used fresh water and seawater as water mixing and cured of concrete. In her research has examined the workability, compressive strength, and microstructure of SCC. From the results of her research, the increase in compressive strength of SCC using sea water and fresh water experienced the most significant difference at the early age i.e. age 1 and 3 days. This occurs that the sea water accelerates the formation of Tobermorite (CSH) then the bond matrix with aggregate is stronger. In addition, the Friedel's salt formed fills the pores than the micro structure were denser. Increased microstructural density was in line with increasing compressive strength as well as decreasing pore size and porosity (Erniati et al., 2014, 2015a) [7,8]. This study was part of previous research on SCC that uses sea water as mixing water. Problems of the field that often happen are negligence in the implementation cured of concrete, so then the quality of the plan was not matched. This research is part of the previous research about SCC using sea water as mixing water and cured with sea water (Erniati et al., 2014, 2015a; Erniati et al.,