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� <br /> &zpo�ed �urface� of unite �hall be free of chips, craclu, oz other � <br /> imparfection� when viewed from a dietance of 30 feet under diffu�ed <br /> lighting. � <br /> Modular coacrete unit■ ehall contorm to the followiag ortezi�l requirements: <br /> 1. Cement - Matarial• �hsll conform to the following applicable � <br /> �pecification�: <br /> a• Portland Cement - ASTM C 150 <br /> b• Modified Portland Cement - Portlapd cement conforming to <br /> 11&2'M C 150, modified as follow�. Lime�tone - calcium � <br /> carbonate, with a minimum of B5t contenC, may be added to <br /> the cement, provided ehese requirament� of C 150 as modified <br /> are met; (1) limitation on in�oluble re�idue 1.5t; (Z) <br /> limit�tion on air content oi mcrtar - volume percent, 22t ' <br /> m+�cimum; �nd (3) limitation� of lo�■ of ignition - 7t, <br /> c. Blended Cement• - AS1T1 C 618 <br /> d• Pozzolana - ]1STM C 61B <br /> e. Bla�t Furnace Slag Cemept - ASTM C 959 � <br /> �• Aggregate• - aggreg�te� �h�ll eoafcrm to the following <br /> �pecification�, a� applicable. � <br /> •. Nozmal Neight Aggregatea - qg� C 33 ' <br /> b• Lightvhight Aggregates - AS1T1 C 331 <br /> 3• other con�eituent■ - Air entzaining agaat�, coloring pigment�, <br /> integral water repellent�, finely grpund ■ilica, and other � <br /> con�tituent• �h�ll confozm to appliceble ]18Z77 �tand�rd� or �hall <br /> be ■hor.� by te�t or exper;ence to be aot detrimantal to the <br /> durability of the modular concrete unit• or of �ny matezial � <br /> cuotanarily u�ed in retaining w�ll con�truction. <br /> Modular concrete unit� shall conlorm to the following ■eructural and geometric <br /> requiremeate: � <br /> Compresaive •trength . 3000 p�i minimum; <br /> Ab�orption . e• maximum (5f ia northern •tate�) for •tandard �veight <br /> �ggregeter; <br /> Unit depth - 20 inche■ maximum; <br /> Unit width to height ratio . 2.25 : 1; � <br /> iJnit weight - 901b./unit minimum for •tandard weight aggregate■ <br /> Inner-unit ehear atrength - 150o plf minimum at 2 p�i nozmal pre�ture; <br /> C7eogrid/unit peak connection •trength - 1000 plf minimum at 2 psi normal t <br /> force <br /> Maximum horizontal qap between ezected unit� �hall be - � inch. <br /> Modular concrete unita shall coaform to the following con�tructability � <br /> requirements: <br /> Vertical setback . vertical; <br /> Alignment and grid positioning mechanism - fibergla�■ pina, two per unit t <br /> minimum; <br /> � <br /> Divi�ion 6 ' <br /> � 6verete station P�ge a <br /> H:\Job�\97093\TRANg\gN� gpg� 100�ed 8[reet •ite\9lSp�C6RI.doc OS/12/00 �� <br /> ' <br />