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The development of efficient, high performance, and porous pure hydraulic limes is an important target for the construction industry with regard to delivering sustainable and easy-to-use materials with a CO2-absorbing free lime content that has the potential to create binders with overall low CO2 emissions. Although lime mortar technology predates cement mortars, lime mortar characterization for national standards currently utilizes know-how derived from cement standards, with a particular focus on ASTM C778–06 sand, volumetric ratios of raw materials, and predetermined water content cured under high relative humidity in order to deliver comparative compressive strength information. We propose several modifications to ASTM C1707-09 that will allow the comparison of pozzolanic hydraulic limes (PHLs) under reproducible conditions in order to provide helpful and robust data, for both the manufacturer and the end user. The proposals are applicable to both new and existing products. These proposals are supported by performance data from the use of a commercial PHL and comparative natural hydraulic limes.
hydraulic lime, pozzolan, pozzolanic hydraulic lime, PHL, mortar, structural, compressive strength, water demand, bulk density, standard test sand
Gibson, Robin R.