1. ASTM. (1978a). “Test methods for moisture‐density relations of soils and soilaggregate mixtures using 5.5‐lb (2.49‐kg) rammer and 12‐in. (304.8‐mm) drop.” D698 American Society for Testing and Materials Philadelphia Pa.
2. ASTM. (1978b). “Test methods for moisture‐density relations of soils and soilaggregate mixtures using 10‐lb (4.54‐kg) rammer and 18‐in (457‐mm) drop.” D1557. American Society for Testing and Materials Philadelphia Pa.
3. ASTM. (1981). “Test method for JIc a measure of fracture toughness.” E813 American Society for Testing Materials Philadelphia Pa.
4. ASTM. (1982). “Test method for moisture‐density relations of soil‐cement mixtures.” D558 American Society for Testing and Materials Philadelphia Pa.
5. ASTM. (1983). “Test method for plane strain fracture toughness of metallic materials.” E399 American Society for Testing and Materials Philadelphia Pa.