“All concrete (state section) shall be waterproofed by the addition of Cementaid HYDROPHOBIC POREBLOCKING INGREDIENT(HPI) named REDSEAL 4 CGW System, in such a way that the concrete shall have a corrected 30 minute water absorption of not greater than 2.30 % as measured by BS 1881:Part 122:1983 except that the age at test shall be 7 days and shall complying with the REDSEAL 4 CGW System minimum requirement stipulated below. The dosage of REDSEAL 4 CGW shall be at the rate of 4 liters per cubic meter of concrete and shall be combined with Hyperplasticiser (SPC203) at 0.45% to 0.55% by weight of cement, so that the resulting (water+4)/cement ratio shall not be more than 0.37 and that the REDSEAL 4 CGW concrete slump prior to placing is at 14 cm to 18 cm. REDSEAL 4 CGW concrete shall be cured using Cementaid CALCURE B*R at a rate of 1 liter per 5 to 8 m2.”