The International Journal of Engineering and Science (IJES) || Volume || 7 || Issue || 5 Ver. III || Pages || PP 25-28 || 2018 || ISSN (e): 2319 – 1813 ISSN (p): 23-19 – 1805 DOI:10.9790/1813-0705032528 www.theijes.com Page 25 Effect of Mineral Admixtures and Quartz Sand on Workability and Compressive Strength Of Self Compacting Concrete Gayathri Komati, Ravi Kumar Garre, Sri Vinay Chowdari Dasari Department of Civil Engineering, QIS Institute of Technology, Ongole, India Department of Civil Engineering, QIS of Institute of Technology, Ongole, India Department of Civil Engineering, Sai Tirumala NVR Engineering College, Narasaraopeta, India Corresponding Author’ Gayathri Komati --------------------------------------------------------ABSTRACT----------------------------------------------------------- Self-compacting concrete is an advanced concrete over conventional concrete. SCC can be placed in form works with avoiding vibration. SCC is a flowing concrete and is able to consolidate under its own weight. SSC improves the filling capacity of highly congested structural members. The main objective of this investigation is of SCC by using partial pozzolanic admixtures i.e, Quartz powder along with Silica fume and with complete replacement of river sand with Quartz sand. The Experimental work involved in optimization of w/c ratio of concrete to be performed as M50 grade mix for SCC used in this investigation, and for which workability studies and compressive strength tests were done at w/c of 0.30 and 0.34 the mix was designed as per NANSU method. For the w/c ratios of 0.30 and 0.34, the compressive strengths for 28 days were 59.53 N/mm 2 and 60.28 N/mm 2 respectively. KEYWORDS – self compacting concrete, Chemical Admixture, Compressive Strength, Workability, W/c ratio, Quartz sand, Slump flow. ------------------------------------------------------------------------------------------------------------------------------------------- Date of Submission: 12-05-2018 Date of acceptance: 28-05-2018 --------------------------------------------------------------------------------------------------------------------------------------- I INTRODUCTION 1.1 General Self-consolidating concrete is a highly flow able type of concrete that spreads into the form without the need for mechanical vibration. Self-compacting concrete is a non-segregating concrete that is placed by means of its own weight. The importance of self-compacting concrete is that maintains all concrete’s durability and characteristics, meeting expected performance requirements. In certain instances, the addition of super plasticizers and viscosity modifier are added to the mix, reducing bleeding and segregation. Concrete that segregates loses strength and results in honeycombed areas next to the formwork. A well-designed SCC mix does not segregate, has high deformability and excellent stability characteristics. SCC may be used in pre-cast applications or for concrete placed on site. It can be manufactured in a site batching plant or in a ready mix concrete plant and delivered to site by truck. It can then be placed either by pumping or pouring into horizontal or vertical structures. In designing the mix, the size and the form of the structure, the dimension and density of reinforcement and cover should be taken in consideration. These aspects will all influence the specific requirements for the SCC. 1.2 Properties of Self Compacting Concrete Current knowledge of these aspects is limited and this is an area requiring further research. Special care should also be taken to begin curing the concrete as early as possible. The workability of SCC is higher than the highest class of consistence described within EN 206 and can be characterized by the following properties: 1. Filling ability 2. Passing ability 3. Segregation resistance A concrete mix can only be classified as Self-Compacting Concrete if the requirements for all three characteristics are fulfilled. 1.3 Applications After the development of the prototype of self – compacting concrete at the University of Tokyo, intensive research was begun in many places, especially in the research institutes of large construction companies. As a