Page 26 - SHELTER
P. 26

THEME PAPER

          1.  Economic viability             construction   schedule.    The   comfort,  and  water tightness.

          2.  Time                           speed of construction is not      Fire resistance  and  acoustic
          3.  Performance                    only the RCC  slab  cycle  but    performance should also be
                                                                               included in these criteria.
                                             finishes time also plays a role to
          4.  Constructability               complete project on-time. Some    Functionality
          5.  Functionality                  technologies eliminate plastering
          6.  Procurement                    and  masonry requirements.  So,   Overall  compatibility of  the
                                                                                                the
                                                                                                      generally
                                                                                         with
                                                                               system
          7.  Sustainability                 these additional activities create   accepted functional requirements
                                             a great impact on saving time.
          8.  Risk factors                   However, new and innovative       is defined as the functionality
          The  criteria falling under  each   technologies have a higher lead   of   the   system.    End-user
          category and its inferences noted   time. Lead time of engineered    friendliness, system flexibility,
          from  the literature review and    and monolithic construction       height limitation and suitability
          interviews are discussed here:     technologies are approx. 1.5 to 3   with different site topography
                                             months. But their execution time   and climatic conditions can be
          Economic viability                                                   considered under functional
                                             cycle is substantially  reduced
          Economic     viability  is   the   compared     to    conventional   requirements of the system. It is
          economic     benefits  of    the   techniques.  Time  should  be     difficult to modify the custom-
          system versus costs. A life cycle   evaluated by  lead time, slab    made formwork, so they cannot
          costing approach needs  to be      cycle, and finishing time.        use this on another project unless
          adopted. This can be  evaluated    Technologies  such  as Tunnel     the design is identical or if the
          by purchase  cost,  maintenance    formwork     and    Aluminium     technology is flexible enough
          cost, and cost of resources -      formwork system have a higher     to accommodate  the design
          manpower,     machinery,    and    initial cost,  but it can shorten   change. So, the possibility to use
          materials. Purchase cost of        the construction schedule  and    a particular technology on other
          the   technology    considering    ultimately reduce overhead costs.   project  and  their suitability for
          minimum      number    of   sets   Likewise, some technologies are   design modification and design
          required is considered as an       less expensive, but it takes more   complexity is important factor
          initial investment. For example,   time to complete the work. So,    to be considered while selecting
          in a four storey-building project,   time and cost are both important   construction  technology.  In
          we cannot recover even purchase    criteria at the time of evaluation,   India,  generally,  LIG/MIG
          cost of tunnel formwork. So, we    depending on the project and      category people are not known
          have to look into the repetitions   its contract clause as contractor   to maintain buildings well, so
          requires to recover the purchase   perspective.                      utilities have to be provided  in
          cost of the technology. The initial                                  manner  which doesn’t  damage
          cost of a technology may be high,   Performance                      affect structural stability  of the
          but it gives  100 repetitions. In   Often  quality   of   concrete   building. So, compatibility with
          such cases, the possibility of use   formwork is judged by  its      MEP services should also be
          in another project also becomes a   surface  finish  and    joints.  evaluated.  Also, there should
          deciding factor.                   However, quality performance      be ease in maintenance and

          Time                               of   technology    should    be   the materials used  should  be
                                             evaluated    through    criteria  available in the local market.
          Owner and contractor both          such as structural strength  and   Builders should be ready to
          are concerned  with the project                                      provide some modification, if the
                                             stability, service life, thermal



          24      HUDCO-HSMI Publication
   21   22   23   24   25   26   27   28   29   30   31