TY  - BOOK
AU  - Oad, Mahboob
AU  - Department Of Civil Engineering
TI  - Compressive Strength Of Concrete With Recycled Coarse Aggregate (ME Theses)
PY  - 2013///
CY  - Nawashsh
PB  - QUEST
N1  - ABSTRACT



Now   days   in   modern   construction	industries,  concrete  is  commonly  used  as construction  material.  It is believed  that  concrete  is the second  most widely used material  after  water.  Every  day  human  needs  are  changing  and  need  of  new construction  and  replacement  of  old  structure  is  unavoidable,  wh ich  results  in potential quantum of the construction waste. This waste is increasing problem s of reducing natural aggregates and adverse impacts on human environment mostly in developing countries. The best practice of managing th is waste is by uti lizing the same in the construction as recycled concrete aggregates. The utilization of th is waste
has a positive effect on the economy and the preservation of natural aggregates.

ln this research work, evaluation of compressive strength of green concrete with used concrete  of  Nawabshah  as  recycled  coarse  aggregate  is studied. Old  concrete  is collected  from  city  area  of Nawabshah  from  demolished  residential  building  at Mohni  bazaar(slab  and  staircases waste  of the  buildings  is  utilized) .7 batches of concrete are prepared with replacement of 0%, 5%, 15%, 25%, 35%, 45% and 50% recycled coarse aggregates. Mix ratio of I :2:4 with 0.45 - 0.60 w/c ratio is used for the purpose. Total number of 54 cylinders with virgin aggregates and 324 cylinders with recycled aggregates using d ifferent percentages are prepared and cured for 7, 14 and  28  days.  Laboratory  tests  have  been  conducted  for  basic  properties and compressive strength . According to the resu lts of this study, it is concluded, with increased percentage of recycled coarse aggregates compressive strength decreases.
Even  replacing  50%  recycled  coarse  aggregate  26%  reduction  was  observed. However, it can be used effectively in the construction works, i.e. for construction of
C. C flooring outside the building , footpaths , part ition walls, sun shade. column for
boundary wall!>, top roof slabs etc.



UR  - http://tiny.cc/4s2cvz
ER  -