Two free water-cement ratios were used, 0.5 and 0.75. These are the highest classes for concretes prepared using sulfate-resisting Portland cement (SRPC) before surface protection is required and are two and three classes higher than those recommended for concretes prepared using Portland cement (PC) and Portland limestone cement (PLC), respectively. The mortar specimens were subject to BS 5328 Class 4A and 4B sulfate exposure conditions. The mortars were prepared from four cements a Portland cement, a sulfate-resisting Portland cement and two Portland limestone cements containing 15% by mass of an oolitic limestone and a carboniferous limestone. The results of a test programme to investigate the sulfate resistance of mortars, immersed up to 12 months at 5 ☌ in magnesium sulfate and sodium sulfate solutions, is described.
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