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C p,nent . <br />Sand . <br />Gr3ve1 . <br />--.-�lass C. Concrete.--- <br />. . . . . . . . <br />one (1) pa.rt. <br />thr�e( 3) -���rts. <br />six (6) parts. <br />Cement used in one (1) cubic yc.rd Class C. Concrete shailnot be <br />less than 1.00 bbls. <br />Above proportiior.s ;aay vary a'.i: �l� 1��itli tlie ma�erisls. E:iact <br />proportions to be ueterm_ne1 by "�a`;er Saperintendent. <br />26. --C �,:Te?T : <br />lhe cement used shall � a true Po�tland cemen� of ��he best quality. <br />dry and free from lumps and all foreign ;,�aterial. It �hall be a cement <br />which uaage has proven to po�sess the p�oper qualifica.tions and uniforra- <br />ity for the �vork intended, It sha11 Ue delivered on the work in the <br />original packag�s, in good condition, properl� l�,beled. and must be �vell <br />protectea from rain and dampness. I� shall be �elivered on �he v�ork in <br />advance. in such quantity as to afiord the `"�ater Superintencent an <br />o�portiuzity to make tes�s isefore the cement shall be used. <br />she cement shall meet the requiremenl:s of the Standard Specifica- <br />tions for Portland Cenen�, adopted by the �erican Society for Testing <br />:_a terials, Rugus�, 16, 1909, ��rith all �.l�e subsequent ar,�endnents and <br />additions thereto adopied by said society. <br />(1 Bariel of Cement equal to 3.8 cubic feet by mea�ure) <br />One sack of cenent shall coutain not less than ninety-four (94) <br />poundsnet. <br />Cement n�hich has been rejec�ced or da:aa�ed in storin,;, shall bc <br />imnediately re;�ioc�e� f:oM t'Ze ���ork at tlie expense of the Contractor, <br />27. --S:le1D: <br />Sand 3ha11 consist of clean, har4, du-rzble, L:ncon�e� �articles <br />free from clay, loara, stick" organic matter and ,ther im�urities. It <br />shall be ��rell graded from coarse to �ine and not less tnan fifteen <br />(15) per cent nor ;r.ore th�:_z thirty--three ( 33) Per cent shall pass a <br />No 30 sieve. One hundred (].CO) pc;r cent shall �ass a screen having <br />square openings ;aeasuri.ng ur.e-fu��.rt� ;.k) inch bet��reen wires. Sand shall <br />be of such �}ualitg that mortal cem�.os�n of one (1) part Por+alnd cement <br />and 'chree (3) parts b� i�=aight �f tae sand in question, v�hen made into <br />briquettes, sh=�1 sho�v a;,Pnsile stren�th at least equal to the strengtn <br />of one (1) to threP (3) :,.ortar of the same consistenc;� and made ��ith tl:e <br />�ame cer�ent and Standard Otta�ra sand. _all sand shull be �•rashed, <br />11. <br />