XI, A, 1 King: Pozzuolanic Properties of Meycauayan Tuff 



29 



W 20 30 40 50 60 10 80 



Number of days in air or water. 



Tensile. Compressive. 



— Mortar in air. Mortar in air. 



— Mortar in water. , Mortar in water. 



— Neat in air. .» .^.. ^ Neat in air. 



— Neat in water. „ Neat in water. 



Fig. 1. Curves showing tensile and compressive strengths of volcanic tuff cement. 



