"LAITANCE."

Dominion, Volume 3, Issue 690, 15 December 1909, Page 7

"LAITANCE."

I '■}' '"' 'THE TEOUULE 4T DOCK*. ''■' :'y\ t '■ I'T^nitajicp". i? ,tljp. technical nape-' for", thp e trpublfl with tbe ppncryete.flporjng.pf the pew' i>: dpck.,- The wqrd js derived, from thir French. t ; anil ijieaji? ''mildness," , , jtljat. i 3: tp pay. that t' fi'Bpoijpy,'■whitish is TfMhgd.piit of !i the concroto by the'action.of the'water under f, ,wMcl» it ha? ligeji l»jd.:.A gipal}:.;am6unf:of . laitauce is usual whenliwet" concrete if. dej posited : iu water,' fresh or: salt, r. but'. the [-' quantity in the prcsen£"instance Is exceptional nbout one-fifth of the weight :of the cement ; haying been waslieii 'opt.,' The Btatbof- the ; concrete has been scientifically, described'in. a •■ report by , .; Mr. Vf. -Ferguson,' ccrisujting , e'nt gineer in thp Harbpur It is.nnderr .; stood that he advises that there, is -no cause !- for; njarm,■ nnd '. tjiat the. work cap. be. dbner sansfact.ofily Witlf wpt concrete/- if certain pre- ■ cautions. «rp;taken. ~ lie' suggests the use of. a , ... :ep»s)4f.■'.' coarser;'." .and-'; iincr^a^in^"". tjxe g vblunioof .cejnent'in. the c6iicrote ■■. by 20~. to, 25 : pej , ; cent;, in the ebnerete mpre !, rapidjy. Thp ; ' questipn. of' buildiijif-the side ~ walls' arid l|fiad of the dpc|c first,' pumping '■■.■ out tlie waiter nnil laying .the' floor in • ; tlie dry, w»3. alsotoiiched , upon by'.llr.' Fer-. Y gusoii. This prppess/Jjoifever, would;be.costly. ,• Further .experiments , wjll be mftde'.. to secure i. inforniapon about the: behayipur of various, -. cements uijder different"'circuriistarices,. and , ' it is inferred that.the board will retjuire more • bxpert inTestjgatipn. and - 'ndvice r before \ tak-; .' : ing any flecision as to the 6teps tb' be adopted! ... iii conpectipn with the'■"■'further, prosecution of' of the dock.\ ' ■',':' ' \