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The Romans introduced and used pozzolanic mortars and cements. In recent years pozzolans are again being used, especially in concrete. With the modifications of ASTM C 270 to include C 595 and C 1157 cements, pozzolans are becoming more common in cement-lime mixes. Failures have been reported in fly ash modified mortars and stuccos, and specifications have been written that limit the amount of fly ash that can be added to a mortar. By combining expertise in masonry with expertise in pozzolans, we have worked with masons and plasterers to develop a line of high-pozzolan masonry cements, mortar cements, and plastic (stucco) cements. Mortars made from these cements exhibit excellent workability, water retention, resistance to the penetration of water, and bond strength. As a side benefit these mortars appear to be more acid resistant than cement/lime mortar or masonry cement mortar tested at our lab. This paper reviews the process of developing the cements and provides test data to demonstrate that they exceed current specifications.
fly ash, masonry cement, mortar, mortar cement, pozzolan, stucco cement
Product manager, ISG Resources, Inc., San Antonio, TX