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Zeolites can either occur naturally, in volcanic rock formations, or can be synthesized in the laboratory. When ground to a fine powder, they can be successfully used as supplementary cementitious material because of their chemical composition consisting in large amounts of SiO2 and Al2O3 that react with Ca(OH)2 to produce C-S-H gels. The composition of synthetic zeolites can be tailored to suit the purpose of their use in cementbased mortar and concrete and they can be produced from a variety of sources and at mu...