Cement Energy and Environment

~ .. iG -----·------·---------, I ,...... 14 -------, - -- -i R"' • 0.$82 I ------- -- -1 ~ ~~ ..!!! ,. e 10 ...., _ ________ , >- ..... a 5 i:n @ 6 i5 Q) '0 4 c • 0 2 ---- __ _ _ .. ____ -- :c () 0 0 10 so 70 eo Electnci31 res•stivity ( kohm em) Figure 6. Calibration CIIIWjor comrol (!(chloride d[lfusivi~v Based on measurements ofelectrical resistivity (Gj orl'). The measurement of chloride ingress can be carried out using a number of techniques, which include chemical tests for chloride content on samples removed at incremental depths from exposed surface, chloride "diffusion tests using two- component cells or accelerated versions of the same. On-line monitoring of service life of structures can be based on initial measurement of cover depth (by magnetic cover meters) and some measure of diffusion co-efficient. It is found to be related to the electrical resistivity of concrete (Figure 6), the latter being more amenable to on-site monitoring. Service life assessment of concrete structures exposed to severe environments in Norway is based on measurement of cover depth and periodic monitoring of electrical resistivity. Measurement of rapid chloride permeability (RCPT) test as per ASTM C1202 for quality control has been adopted in some bridge projects in India. The test is included in IRC 21 and IRC SP: 70 of Indian Roads Congress. However, much remains to be done to assess the durability of concrete and service life assessment. Conclusions • )uality in construction, in its broadest sense, implies fulfillment of techni cal , technological, financial and other societal needs, which the constructed ·facility is intended to satisfy. It is not merely 'conformity to specifications'. • If that be so, we need a 'performance' based approach to quality. Quality should be expressed in terms of 'what quality concrete should ensure'. • Sustainability and durability, including service life, should receive particular emphasis. • Innovating approach to selection of binder systems and alternatives to natural aggregate should be encouraged. • Facilities of reli able and accurate testing should be widely available. • New tests for durability and monitoring service life should be explored. Courtesy: ICI Journal April - June 2011, Pp23- 28. C Plant & Machinery ] NEW PLANTS- EQUIPMENTS & MACHINERIES IN INDIAN r.FMENTINDUSTRY Andhra Cements (Durga Cement Works) A contract was awarded to Thermoteknix Systems for the purchase of a Centurion Infrared Linescanner with WinCem kiln shell visualization software system for the monitoring of kiln shell temperatures. Andhra Pradesh plant (JSW Cement) JSW Cement purchased a Thermo Scientific CB Omni online analyzer, to be located after the primary crusher and used to analyse all materials being fed to a preblending longitudinal stockpile. Andhra Pradesh Cement plant (Uitratech Cement Limited) Bricking Solutions was awarded a contract for the purchase of a bedding cart for a 4.75 m and 5.85 m kiln for beddi ng bottom to centre line of kiln. Anjan plant (Jaypee) Jaypee purchased two Thermo Scientific CB Omni online analysers. The elemental ana lysis results from CB Omni analysers will be used in closed loop feed back to control raw mix proportioning. Awarpur Cement Works (Uitratech Cement Limited) A 12 in. wide x 200 ft. long hydraulic conveyor for transporting refractory in the kiln or transporting coating out of the kiln has been supplied by Bricking Solutions. II