What is it about?
This study tests the hypothesis that ASTM C1240 does not adequately qualify nano-silica pozzolans for use in concrete. The main concern in this study is that ASTM C1240 has the potential to provide an “inapplicable procedure” for nano-silica materials. The tests outlined in ASTM C1240 were adjusted and performed to study the effects of various particle sizes and dosages on the compressive strength of blends in standard mortars.
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Why is it important?
The present study aims to assess the adequacy of ASTM C1240 in qualifying nano-silica for use in concrete and to introduce a modified procedure to measure the pozzolanic activity of nano-silica used with cementitious composites.
Perspectives
Nano-silica particles are amorphous materials with high purity and a specific surface area and therefore have the great pozzolanic potential. However, the pozzolanicity measurement procedure of such nano-silica materials has not yet been clearly established. The ASTM C1240 test procedure is problematic for determining the pozzolanicity of nano-silica for many reasons. The main concern in this study is that ASTM C1240 has the potential to provide an “inapplicable procedure” for nano-silica materials. The tests outlined in ASTM C1240 were adjusted and performed to study the effects of various particle sizes and dosages on the compressive strength of blends in standard mortars. The criterion conceived was validated at two ages: 7 and 28 days.
Dr. Maan S Hassan
University of Technology, Baghdad, Iraq
Read the Original
This page is a summary of: Adequacy of the ASTM C1240 Specifications for Nanosilica Pozzolans, The Open Civil Engineering Journal, March 2019, Bentham Science Publishers,
DOI: 10.2174/1874149501913010042.
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