ICI Students' Chapter AISSMS COE 7July2013

Indian Concrete Institute (ICI) Students' Chapter Inauguration 
7 August 2013 

The students’ chapter of Indian Concrete Institute (ICI) was inaugurated at All India Shri Shivaji Memorial Society’s (AISSMS) College of Engineering, on 7 august 2013. Sh R M Telang (Chairman: ICI Pune Centre) and Sh V B Parasnis (Past Chairman), Dr J D Bapat (Key Note Speaker) and Sh P B Nangare (HOD: Civil) were present. The programme was attended by nearly 70 students and the faculty. The summary of the key note is given below; click on the link below to view the photo album.

The ready mix concrete or RMC is concrete mixed in a stationary mixer in a central batching and mixing plant or in a truck-mixer, supplied in fresh condition to purchaser, either at site or into purchaser’s vehicle. Ready mix concrete business in India is in infancy. In Japan nearly 70% of cement is used by RMC business, whereas in India RMC business uses only 2% of total cement. Although the first RMC plant operated in India in 1987, the growth of RMC has picked up only after 2000. Presently most RMC plants are located in 7 large cities of India and contribute 30-60% of total concrete used in these cities. In spite of 12-20% higher cost compared to site mixed concrete, growing popularity of RMC in cities is for the reasons of constraints of construction space and the need to control environmental pollution.

Properly graded manufactured sand satisfies requirements of fine aggregate for RMC, such as strength, gradation, shape, angularity etc. The selection of quarry is very important for obtaining quality fine aggregate.

RMC has the following advantages:                                                                                                                                                           * Better quality concrete is produced                                                                                                                                                         * Elimination of storage space for basic materials at site                                                                                                                           * Elimination of procurement / hiring of plant  & machinery                                                                                                                             * Wastage of basic materials is avoided                                                                                                                                                             * Labour associated with production of concrete is eliminated                                                                                                                           * Time required is greatly reduced                                                                                                                                                               * Noise & dust pollution at site is reduced                                                                                                                                                 * Organisation at site is more streamlined                                                                                                                                               * Currently RMC is marginally expensive compared to site mix  concrete due to transportation of concrete. Considering the advantages of RMC, cost factor is negligible.                                                                                                                                                                                   * When high strength of concrete and high volume of concrete is required, RMC remains a better choice

The free water-to-cement/binder_ratio (w/c or w/b), grade of concrete, minimum cement content and the workability at the point of delivery are the important control parameters, as per IS 4926.

Normally, RMC plant has production capacity of 30-60 m3 /h, which varies according to the capacity of batching plant. More common capacity is     30 m3/h  or 90,000 m3/y, based on 300 working days and single shift of 10 h. To set up RMC plant, around 1 acre land is required. In a typical RMC  plant, around 20 laborers are required. The RMC plants should be installed at a place where consistent concrete consumption, regular supply of cement and water are ensured. 

The key note was followed by Q/A session in which faculty and the students actively participated. 

View photo album of the event

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