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Abstract A brief summary of conclusions that can be drawn from the previous detailed results are presented below: I- the following factors affected considerably the drying-shrinkage of concrete: a) Water-cement ratio: an increase of I percent increased total shrinkage by about I percent. b) Cement content: an increase of I percent increased total shrinkage by about 1/2 percent. c) Aggregate content: the relative values of total shrinkage of neat cement paste to cement mortar to concrete were 4:2:1 respectively. d) Aggregate type: the gravel mixes gave the greatest amount of drying-shrinkage compared to other aggregates such as limestone and basalt. e) Aggregate size: increasing the aggregate size reduced the drying-shrinkage and so the coarse aggregate was the prominent in decreasing the drying shrinkage. f) Additions: hydrated calcium chloride increased considerably the drying-shrinkage the addition of pozzolance materials increased also the drying-shrinkage. g) Curing: moist curing caused higher shrinkage values more than those of air curing. Noticing that the shrinkage values were measured after the curing period. h) Reinforcement: an increase in reinforcement percentage decreased the shrinkage values. 2- The shrinkage values at periods of 30, 100 and 500 days after the curing period attained about 60, 80 and 95 percent of the total shrinkage values; these ratios was nearly independant of all factors. |