Natural Pozzolans for general concrete use is covered under ASTM C - 618, Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete
Pozzsource's Natural Pozzolans exceed the requirements of ASTM C - 618.
Pozzsource's Natural Pozzolans provide exceptional ASR mitigation as measured by A STM C-1260 and C-1567
