1. ASTM Standard C29/C29M-91a, 1993. Standard test method for unit weight and voids in aggregate. Annual Book of ASTM Standards. ASTM International, West Conshohocken, PA.
2. ASTM Standard C109-91, 1993. Standard test method for compressive strength of hydraulic cement mortars. Annual Book of ASTM Standards. ASTM International, West Conshohocken, PA.
3. ASTM Standard C938-80, 1993. Standard practice for proportioning grout mixtures for preplaced-aggregate concrete. Annual Book of ASTM Standards. ASTM International, West Conshohocken, PA.
4. ASTM Standard D4253-93, 2000. Standard test methods for maximum index density and unit weight of soils using a vibratory table. Annual Book of ASTM Standards. ASTM International, West Conshohocken, PA.
5. ASTM Standard D4254-91, 2000. Standard test methods for minimum index density and unit weight of soils and calculation of relative density. Annual Book of ASTM Standards. ASTM International, West Conshohocken, PA, 2000.