tailieunhanh - Báo cáo vật lý: "Mechanical Strength of Trass as Supplementary Cementing Material"

Tuyển tập các báo cáo nghiên cứu khoa học trên tạp chí khoa học vật lý quốc tế đề tài: Mechanical Strength of Trass as Supplementary Cementing Material | Journal of Physical Science Vol. 19 2 51-59 2008 51 Mechanical Strength of Trass as Supplementary Cementing Material V. Indrawati and A. Manaf Universitas Indonesia Postgraduate Program of Materials Science Kampus UI Jl. Salemba Raya No. 4 Jakarta 10430 Indonesia Corresponding author Abstract The suitability of trass in Indonesia as a supplementary cementing material was investigated and studied. Mechanical properties of pozzolanic-lime obtained from trass reacting with lime were evaluated according to procedure ASTM C-593. Compressive strength of mortar was measured at ages of 2 3 7 14 and 28 days. In addition to the compressive strength pozzolanic reaction of trass and lime was also evaluated by Thermal Activity Measurement TAM Air Calorimeter. Results showed that increasing of fineness until 9000 Blaine resulted strength of 60 kg cm-2 at age of 2 days. Further increase in compressive strength of 90 kg cm-2 at the age of 2 days was obtained by the addition of wt. Na2SO4. Results of TAM Air Calorimeter of pozzolanic reaction showed that heat released followed a linear and exponential correlations for increasing fineness and addition of Na2SO4 respectively. Keywords trass pozzolanic reaction supplementary cementing material 1. INTRODUCTION Nowadays pozzolanic materials are widely used as supplementary cementing material in Portland cements and may replace part of the clinker in order to enhance the performance of the hydrated cement. Such composite or blended cements are employed for their economic ecological and technological benefits. Energy consumption as well as CO2 emission is reduced. Supplementary cementing materials reduce lime content in hydrated Portland cements and replace it with pore-filling cement hydrates which are known to improve the ultimate strength impermeability and durability to chemical attack of Different types of additions are used such as pozzolanic natural pozzolan low .