1. Abdul Awal AS. Manufacture and properties of pre-packed aggregate concrete. Master thesis. University of Melbourne, Australia; 1984. p. 121.
2. Grouted concrete construction;Champion;Reinf Concr Rev,1958
3. Casson RBJ, Davies IL. Performance of concrete backfilling materials for shafts and tunnels in rock formations, vol. 1. Commission of the European Communities, Directorate-General Science, EUR 10383EN/1; 1986. p. 91.
4. Effect of quantity of sand on the compressive strength of two-stage concrete;Abdelgader;Mag Concr Res,1996
5. Investigation into the viability of using two stage (pre-placed aggregate) concrete in an Irish setting;O’Malley;GSBEIDCO-1st,2009