International Journal of Advanced Engineering Research and Science (IJAERS) [Vol-4, Issue-12, Dec- 2017] https://dx.doi.org/10.22161/ijaers.4.12.25 ISSN: 2349-6495(P) | 2456-1908(O) www.ijaers.com Page | 170 Utilization of Colemanite waste in Concrete Design Umur Korkut Sevim, Murat Ozturk, Muzeyyen Balcikanli Bankir*, Umran Aydin Department of Civil Engineering, Iskenderun Technical University, TURKEY Abstract— Waste material is formed in enormous quantities during the beneficiation of raw ore. These wastes can cause both economic loss and environmental pollution. Thus, in this study, the effect of CW obtained from Eti Mine Establishments Kütahya-Emet Boron Plants on the compressive strength and cylinder splitting tensile strength of concrete and its usability as a concrete admixture is investigated. The results found show that utilization of Colemanite Waste is possible when it is used as additive in concrete. Keywords—Boron, Colemanite, Concrete, Utilization, Waste. I. INTRODUCTION Turkey has 72% of the world's total boron reserves and produces 1.72 million tons per annum [1]. There are three important boron mineral in Turkey which are ulexite, tinkle and colemanite. Waste material is formed in enormous quantities during the beneficiation of raw ore. These wastes can cause both economic loss and environmental pollution. The use of these wastes as additives in the production of concrete will contribute to both economic and environmental protection. Some waste materials, which are very similar to Portland cement and have pozzolanic properties in terms of their basic composition, can be used as building materials. Although the mineral additives used in concrete have similar physical properties and mineralogical and chemical compositions to Portland cement. Due to pozzolanic activity of these substances they have a role in formation of hydration products due to pozzolanic activities. Thus, while the various properties of the concrete are improved, mineral additives with high pozzolanic activity can improve the void structure, resulting in a denser structure, increasing the adherence between the aggregate and matrix interface, and achieve high strengths [2]. Colemanite and Tinkal Concentrator consist of eight oxides (Al2O3, SiO2, MgO, Fe2O3, CaO, SO3, Na2O, K2O) forms cement’s chemical composition of the wastes and other additives used in cement production [3].These materials has been the subject of many researchers to develop new materials[4-9]. In another study, mechanical properties of colemanite-added concretes were investigated. Colemanite was added at different ratios as cement admixture and it has been reported that the colemanite admixture has no significant effect on workability and the strength values do not show any significant change compared to the control concrete when the amount of added colemanite does not exceed 10% by weight [10]. CW is used as an aggregate, the physical and mechanical properties of the concrete produced were investigated. Properties such as air content, compressive and tensile strength, Schmidt test, modulus of elasticity, freeze-thaw resistance, unit weight were investigated. As the colemanite ratio increases, the engineering properties of concrete are improved [11]. To determine the effect of Kütahya-Emet colemanite on the splitting tensile strength and shrinkage properties of mortar, samples were tested at 7, 28, 56 and 90 days. It has been stated that concrete mixtures containing 3% and 5% CW have higher strength compared to the control concrete and that the shrinkage of the mortar compared to the control sample is reduced by 37%. Based on these results, it was CW could be used as an effective anti-shrink agent in terms of cost [12]. Studies on the use of colemanite waste (CW) as a mineral additive in concrete and mortars instead of a part of cement are limited in the literature. In this study, the effect of CW obtained from Eti Mine Establishments Kütahya-Emet Boron Plants on the compressive strength and cylinder splitting tensile strength of concrete and its usability as a concrete admixture is investigated. II. MATERIAL AND METHOD 2.1. Materials The cement used in this study is normal (CEM I 42.5 R) Portland cement in accordance with TS EN 197-1: 2002, manufactured by Adana Cement Industry. The cement has a specific gravity 3.15 g/cm 3 and 3230 cm 2 /g Blaine fineness. Chemical properties of cement (CEM I 42,5 R) Table 1. CW was taken from Kütahya-Emet Eti Boron Plants dried and milled. The grinding process was carried out at Adana Cement Nardüzü Ready-Mixed Concrete Plants. Blaine fineness value is 4140 cm 2 /gr and specific gravity is 2.43 gr / cm 3 . Natural sand as fine aggregate, crushed stone having maximum aggregate diameter of 22 mm as coarse aggregate was used. The dry surface