a[mm]/l - Memorial University of Newfoundland DAI

and m Canada CSA type LO cement are the most used type of cements to pmduce hngh-
strength COnClelE.
Watersemen1 muo a typtcnlly expressed as the total weight of water to the total
wctgh! of cement. In addanon. warerscmenrlllous matenvl ratlo ,r expressed as !he rota1
werght of wscr to the total combnncd wash1 of all ccmentttlous marenalr. In both carer.
:hc total uelgh! of uateiexcludes that absorbed by The aggregales. but lncludei my uatlr
intrduich !ntn ?he mlrture as pan of an adm#xIure. Some of the more finely ground
ponland cements such as ASTM type I11 (h~gh-early-~trcngth) will have hlghcr mnxnng
water requrement for equal workab~bty. pantcularly at law wnlereemenr ratnos. nnd mny
pmmoa npvd st!ffcn~ng m hot weather. Unfonunatcly. thm type of cement !r not
recommended for high-strength concrete
2.12.2. Aggrewta
Aggregates are lhorc pans of the concrele that constttule the bulk of the Sntshed product
Aggregates constatute the major pan of the mlr and compnre 60% lo 80% of the volume
of the concrete, They have to be so graded that the whole mass of concrete scs ;Is I
relntlvely rohd. homogcncou~. dense camb~natlon. wxrh the rmtller rlus acung ar an
filler of the votdn.
Usually, the man components of aggregates can bs dtvlded ~nto two typr (I)
coarse aggregate: gravel, emshcd rcnc. or blast furnace dag: and (1) Snc aggregate:
nauml or manufacturd sand. The coarse and fine aggregates are de~cnbed bneny m the
followmg drwusnm.