IB-P-BC 2002-031 Concrete Proportioning and Admixture - ladbs
IB-P-BC 2002-031 Concrete Proportioning and Admixture - ladbs
IB-P-BC 2002-031 Concrete Proportioning and Admixture - ladbs
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P/<strong>BC</strong> <strong>2002</strong>-<strong>031</strong>TABLE NO. 2 - ARBITRARY MIX PROPORTIONSAssumedCompressive Strength(psi)Maximum AggregateSize(In.)5000 13/84000 1 ½13/83000 1 ½13/82500 1 ½13/82000 1 ½13/8Minimum CementContent Sacks perCubic Yard8.59.27.17.37.96.06.26.85.45.56.35.05.25.8Maximum WaterContentGallons per Sack4.55.05.35.55.76.26.26.27.07.07.08.08.08.0IIAs authorized by LA<strong>BC</strong> section 1903.6 the following method for qualifying admixtures is approved.<strong>Admixture</strong> Qualification Alternate:Alternate <strong>Admixture</strong> Qualification Method utilizes two concrete mixes: one with one-inch maximumaggregate <strong>and</strong> one with 3/8-inch maximum aggregate. Both mixes are to be tested with theadmixture <strong>and</strong> with a control mix of identical proportions except for omission of the admixture.Exception: For classification as a water reducing admixture, the cement content in the mixcontaining the admixture shall be reduced by 0.6 sack per cubic yard of concrete. Thewater content shall be adjusted so that the water/cement ratio is equal to that of the controlmix. If the resulting slump is less than that of the control mix, additional water shall beadded to provide equal slump.The one-inch maximum aggregate mix shall have a cement content of 5.6 sacks per cubicyard, <strong>and</strong> the 3/8-inch maximum aggregate mix shall have a cement content of 7½ sacksper cubic yard. Cement used shall be a uniform blend of cements obtained from fourseparate mills <strong>and</strong> shall conform to Type I, Type II or a blend of Type I <strong>and</strong> Type II cement.As a covered entity under Title II of the Americans with Disabilities Act, the City of Los Angeles does not discriminate on the basis of disability <strong>and</strong>, upon request, will providereasonable accommodation to ensure equal access to its programs, services <strong>and</strong> activities. For efficient h<strong>and</strong>ling of information internally <strong>and</strong> in the internet, conversion to thisnew format of code related <strong>and</strong> administrative information bulletins including MGD <strong>and</strong> RGA that were previously issued will allow flexibility <strong>and</strong> timely distribution of informationto the public.Page 3 of 4