the volume of lightweight aggregate per 1 kg of cement (dm3);
WEv, the specific weight of lightweight aggregate (kg/dm3); s, the
weight of sand per 1 kg of cement (kg); WEs, the specific weight
of sand (kg/dm3) and x, water/cement ratio (kg).
To starting mixture, the quantities obtained were: cement:
2.59 kg; lightweight aggregate: 10.37 dm3; sand: 12.12 kg and
water: 1.55 dm3. Tables 4 and 5 shows the quantities of materials
for all mixtures.