reinforced concrete

reinforced concrete

Method Installation Steel Reinforced Concrete Pipe

1mo ago
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Description

When samples are obtained for testing, they shall be taken as described in EPG 1036 Reinforcing Steel for Concrete, except for Welded Wire Fabric. Welded wire to be sampled for Laboratory testing is to be field measured for size prior to sampling. Each circumferential wire across the width of the fabric is to be measured. The manufacturer may use over-sized wire in the fabrication of welded wire fabric, but not under-sized wire. The size differential shall not exceed one "W" size increment on sizes W8 and smaller and two "W" size increments on sizes larger than W8. "W" sizes referred to are those shown in AASHTO M32. In all cases where over-sizing exists, the fabric shall be identified and used as that originally ordered or offered for use. If the wire does not meet the specification requirements, it is not to be sampled and submitted to the Laboratory. It is to be rejected in the field unless measurements are such that Laboratory verification is needed. When verification is needed, it should be so stated on the identification sheet accompanying the sample. Samples of welded wire fabric representing each lot shall consist of two pieces of longitudinal wire not less than 24 in. (600 mm) in length. Samples of the transverse wires are not required. A lot of welded wire fabric is 25,000 sq. ft. (2300 sq.meter) or fraction thereof of one style of fabric with the same size wires and spacing. Regardless of the basis of acceptance of reinforcing steel for concrete pipe, it shall be field inspected for diameter and spacing of circumferential steel. The inspector is to examine laps and welds and, when required by Sec 1026, a representative sample shall be taken for testing of welded laps or butt welds. Such a sample shall consist of two pieces, each with a clear length of 12 in. (300 mm) either side of the weld and is to be taken at least once a year for each size of steel welded and each length of lap being used.