The Rolling Straight edge is pushed at 1-2km/h and the number of irregularities, their length and distance from start, are recorded. The national specifications for surface regularity are then compared and the pavement accepted or rejected and or remedial work undertaken. Optional 2.5 mm incremented wedges are available, which offer a range of 12.5 mm low to 12.5 mm high. Specifications

Edge / Straight Edge 3M Faithfull FAIFE10 Aluminium Feather Edge / Straight Edge 3M

ACCURATE, SAFE AND PERFECT FOR EVERYDAY USE BY CAREFUL PROFESSIONALS. DESIGNED BY MAUN TO GET THE JOB DONE.SpecificationThe rolling straight edge is shipped in 3 wooden cases with a total gross weight of 112kg. The Rolling Straight edge measures depressions on the pavement surface on analogue scale 0-12mm + 0.25mm. The straight edge also has an odometer for accurate determination of distance travelled in units of 1 metre.

Rolling Straight Edge | Impact - civil engineering materials Rolling Straight Edge | Impact - civil engineering materials

The Rolling Straight edge was developed in conjunction with TRL. It is produced as an instrument to assist engineers with construction, quality control and with compliance assessment, of newly laid pavement regularity. Our tools have been in action for over 75 years. Each and every one is engineered to last and has been since 1944. Also available in lengths of 300 mm, 500 mm, 600 mm, 800 mm, 1000 mm, 1250 mm, 1500 mm, 1850 mmand 2000 mm. The 3m straightedge was superseded by a new 2m straight edge and is the method is adopted in the current BS 8204, BS EN 13670 execution of concrete structures, the National Structural Concrete Specification and National Building Specification. Both straightedges are offered to contractors working to both the old and new specifications. If the rate of testing is not known, then we would recommend the following formula to calculate the minimum number of straight edge tests.

For a proposed revision of BS 8204 in 2003, a straight edge with feet was again suggested, which was intended to be more portable than the 3m straight edge. This consistedof a collapsible 3m long frame with a wire stretched to standard tension from which to measure the deviation was proposed. This method was rejected in favour of a 2m straight edge set on the slab and is the methodis adoptedin the currentBS 8204,BS EN 13670 Execution of concrete structures, the National Structural Concrete Specification and National Building Specification.

Tradewise SE4 Aluminium Straight Edge 75mm x 38mm Tradewise SE4 Aluminium Straight Edge 75mm x 38mm

ReferencesT.S.O. - Highways Agency - Specification for Highway Works. This document details requirement in term of the maximum permissible number of irregularities beneath a Rolling Straight edge.Please keep your proof of postage from the Post Office until we have confirmed that we have received your returned items. A method of assessing flatness was given in CP 204: 1965 In-situ floor finishes (metric edition 1970) which used a 10ft (~3m) straight edge that was not set directly on the slab but on feet. No apparatus description was given, nor methodology to cover its use or sampling criteria. The idea was to assess unevenness below the temporary datum of the straight edge as a +/- measurement. The location and orientation of tests can be discussed by calling Face Consultants on +44 (0) 1484 600090. It may be necessary to ensure repeatability in the case of any dispute. Related Documents