The American Society for Testing Materials (ASTM) defines pozzolan as a “siliceous or siliceous aluminous material which in itself possesses little or no cementitious value but will, in finely divided form and in the presence of moisture, chemically react with calcium hydroxide at ordinary temperatures to form compounds possessing cementitious properties”.

Classification

Class N – “Raw or calcined natural pozzolans that comply with applicable requirements, such as some diatomaceous earths; opaline cherts and shales; tuffs and volcanic ashes or pumicites, calcined or uncalcined; and various materials requiring calcinations to induce satisfactory properties, such as some clays and shales.”

A natural siliceous (amophous) mineral, made from the layers of diatoms and volcanic tuffs of Northern California's Cascade range. Lassenite Type N Pozzolan conforms to ASTM C-618, Federal Specifications #SS-C-1960/5 and CSA-CAN-A266-3M (Canadian) specifications for Type N (Natural) Pozzolan and meets specification requirements of the NRC for use on Nuclear Reactor Program, California Department of Water Resources, Corp of Engineers, U.S. Water and Power Resources Services, Cal Trans, Pacific Gas and Electric; Idaho Power and Arizona Public Service for hydralic structures and power plants; Bechtel Corporation for hydralic structures; municipalities for waste water treatment and transportation facilities.

TEST REPORT COMPARISON POZZOLAN “N” VS ASTM C618, CLASS N