Cement Energy and Environment

and high pivot point crushing action , and 2,500-hp direct drive with a variable speed option. In the gyratory crusher marke·:, FLSmidth continues to offer its line of TS gyratories, built around the principle that major crusher service and maintenance functions should be made as safe and convenient as possible. Accordingly, in the TS line the eccentric assembly, bushings and hydraulic piston are easily accessible and removed through the top of the crusher. The TS line has two variations available, depending on the application and customer requirements. Heavy Duty TS units am suitable for most mining applications, while Ultra Duty TSU units are designed for extreme applications where additional motor power and heavier sections are necessary. Substantial Sizers TAKRAF now offers standardized primary and secondary sizers for various crushing applications. The primary sizer product range covers inlet sizes from 2.5 m to 4 m with throughputs of up to 10,000 mt/h, while the secondary sizer range offers inlet sizes from 2 m to 4 m with throughput rates up to 3,500 mt/h. TAKRAF said it paid close attention to ease of maintenance, reduced downtime and extended service life during the line's initial development. Some of the innovations resulting from this focus are provisions for convenient changeout of crushing segments, and the use of advanced wear-resistant items such as hard-faced segments and tungsten picks. Other features include an inching drive for roll maintenance, a heavy-duty drivetrain and an efficient oil lubrication system. Meanwhile, thyssenkrupp announced that its complete RoiiSizer series-capable of crushing medium-hard rock as well as sticky and soft material- has been standardized and new models added. As a result, according to the company, the entire range of crushing applications can now be handled by RoiiSizers. The company highlighted its RoiiSizer DRS 660X3000 S at the bauma show. With a roll length of 3 m and shaft center distance of 660 mm, the RoiiSizer DRS 660X3000 S is the second largest member of the family of secondary and tertiary RoiiSizers. The DRS 660X3000 S fea1Ures a direct drive system consisting of two spur gears with fluid couplings. The couplings allow startup even under the load of a full crushing chamber, and also provide overload protection; when the sizer encounters an uncrushable object, the fluid slip provided by the couplings protects the machine against damage. Drive torque is provided by two 250-kW electric motors. TAKRAF"s primary and seo:mdary sazers art SUitable lor all typesol teed rnaterral. accordrng tothe company. Courtesy: E&MJ Engineering and Mining(online), May 2016 Pg. no. 48-51 Quality & Standards STRENGTH PROPERTIES OF FIBROUS LIGHT WEIGHT CONCRETE WITH PUMICE AGGREGATES AND STEEL FIBER N. Sivalingarao1, V.B. Desai2, B.L.P. Swami3, C. Mohan/a/4 1 Research Scholar. Department of Civil Engineering, JNTU. Ananthapur 2 Professor, Department of Civil Engineering, JNTU, Ananthapur 3 Professor & Co-ordinator, Research & Consultancy, Department of Civil Engineering, Vasavi College of Engineering, lbrahimbagh, Hyderabad 4 Associate Professor, Department of Civil Engineering, Vasavi College of Engineering, lbral1imba9h. Hyderabad Abstract: In the present experimental investigation, conventional M-25 concrete mix is designed by using normal concrete materials like cement, sand, crushed granite stones and water giving a proportion of 1:1.67:2.85/0.45. Crushed granite stone aggregate is replaced with light weight aggregate (pumice) in various percentages of 0, 25, 50, 75, 100% and fibers were added at 0, 0.5, 1.0% by volume of concrete and cement is replaced by fly ash and silica fume by 20% and 10% by weight of cement respectively to produce 30 combinations of fibrous light weight concrete -l6