Polished Stone Value of Aggregates and In-Service Skidding Resistance (TRL 322) (TRL Report) S.A. Hartshorne - quixoticals.com
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The Polished Stone Value of aggregates and in. - TRL.

Roe PG Hartshorne SA TRL report 322: The polished stone value of aggregates and in-service skidding resistance Crowthorne TRL Roe PG Sinhal R Recent developments to the Scrim measurement technique in the UK International Conference on Surface Friction of Roads and Runways, Christchurch New Zealand Wokingham TRL Roe PG Dunford A Crabb GI TRL. the polished stone value [9]. This European Standard specifies the method for determining the polished stone value PSV of a coarse aggregate used in road surfacing. PSV is a measure of the resistance of coarse aggregate to the polishing action of vehicle tires under conditions similar to those occurring on the surface of aroad. The Polished Stone Value of aggregate gives a measure of resistance to the polishing action of vehicle tyres under conditions similar to those occurring on the surface of a road. The action of road vehicle tyres on road surfaces results in polishing of the top, exposed aggregate surface, and its state of polish is one of the main factors affecting the resistance to skidding.

Dec 12, 2016 · So, skid-resistance values have not been accounted for during the aggregate selection and mixing processes. In this study, a skid-resistance predictive model at the construction stage was developed based on the essential aggregate and mixture characteristics that are the influential factors. Roe, P.G. & Hartshorne, S.A. 1998 The Polished Stone Value of Aggregates and In-service Skidding Resistance. TRL Report 322. TRL Report 322. Transportation Research Board Journal, Washington, USA. The aggregate applied for the wearing course has a significant influence on skid resistance of road surfaces. However, it is difficult to evaluate the behaviour of road surface in use on the basis of the Polished Stone Value PSV determined for the aggregate according to the so called ‘British method’.

The prepared samples of various levels of Polished Stone Value PSV were then subjected to cycles of polishing to Equlibrium Skid Resistance ESR levels. The skid resistance was measured periodically with a static skid tester, the. Polishing Aggregates to Equilibrium Skid Resistance. Resistance to polishing. Polished stone value PSV - This is a most important test that an aggregate can undergo if it is to be used as a road surface course. If an aggregate polishes too much under the polishing effect of vehicle tyres, the road surface becomes very slippery, especially when wet, and the number of skidding accidents can increase. Abstract. The aggregate applied for the wearing course has a significant influence on skid resistance of road surfaces. However, it is difficult to evaluate the behaviour of road surface in use on the basis of the Polished Stone Value PSV determined for the aggregate according to the so called ‘British method’. Roe P, Hartshorne SA 1998 The polished stone value of aggregates and in service skidding resistance. TRL Report 322, Crowthorne: Transport Research Laboratory Senga Y, Dony A, Colin J, Hamlat S, Berthaud Y 2013 Study of the skid resistance of blends of coarse aggregates with different polish resistances.

P.G. Roe, S.A. Hartshorne, “The Polished Stone Value of aggregates and in-service skidding resistance” TRL Report 322. Crowthorne,1998. 9. P.G. Roe, A. Parry, H.E. Viner, “High and low speed skidding resistance the influence of texture depth” TRL Report 367. The Polished Stone Value of Aggregates and In-Service Skidding Resistance. Roe P G, Hartshorne S A 1998. The Polished Stone Value of Aggregates and In-Service Skidding Resistance. TRL Report. to abrasion. The Polished Stone Value PSV was also measured to evaluate the resistance of aggregate to the polishing action of vehicle tires under the similar conditions on the road surface. The testing procedure is described in the standard test method BS812-114, Testing.

Skid Resistance Testing of Aggregates Polished Stone Value.

Roe PG and Hartshorne SA 1998 The Polished Stone Value of Aggregates and In-Service Skidding Resistance. Transport Research Laboratory, London, UK, TRL Report 322. Measurement of Skidding. the surface friction values obtained changed little after 10 hr. Thereinafter, the samples were run for times of only 10.5 hr Figures 1-6. The wheel revolved at 320 rpm; testing was stopped at 200,000 revolutions and final PV was obtained. The higher the PV obtained at the 10.4-hr testing the better the skid resistance of the aggregate. Indeed, the values of Los Angeles LA, Micro Deval MDE and PSV Polished Stone Value tests do not always fulfil national requirements to be used in road pavement wearing courses. As a consequence, asphalt concrete made with these aggregates presents low values of skid resistance and a high sensitivity to polishing. The Polished Stone Value of aggregates and in-service skidding resistance. Objectives: To determine the relationship of in-service roads to the polishing resistance of aggregates and the level of traffic using such roads. Authors: P. G. Roe and S. A. Hartshorne; Published: TRL. Aggregate with a LA value of less than 30 LA 30 is considered strong enough for use in coating and road surface treatments i.e., surface dressing. Railway Ballast: The test is modified to test railway ballast, in that 5kg of 32/40, together.

Nov 21, 2017 · Slip Resistance of Polished Concrete CPC Position Statement 2 P olished concrete provides a smooth surface that is durable, light reflective, and easy to maintain. Typical uses for polished concrete include schools, airports, retail spaces, casinos, restaurants, hospitals and medical facili The polished stone value of aggregates and in-service skidding resistance. TRL Report No. 322, Transportation Road Laboratory, UK, 1998. Google Scholar. 17. EN 1097-8. Tests for mechanical and physical properties of aggregates. Part 8: Determination of the polished stone value. 2009. Google Scholar. 18. EN 13036-4. Road and airfield surface.

Polishing of the aggregates used in pavements may reduce the friction of the road surface, which in turn may lead to slippery, hazardous conditions in traffic. Although the use of studded tyres leads to wearing of the pavement and thus prevents the aggregate becoming smooth, it also results in the generation of airborne dust. As a consequence, the trend to reduce the use of studded tyres and. The PSV test calculates a Polished Stone Value for aggregates used in road surfaces, which gives a measure of the resistance to skidding. The test is carried out by using two machines, S882 - the Accelerated Polishing Machine, and S885 - Skid Tester, see separate Data Sheet for this machine. skidding resistance - aggregates having a PSV of 58 or above must be subject to Attestation Level 2, but for all other purposes Level 4 is applicable. Note This bulletin sheet does not replace the relevant product standard - BS EN 12620 - or the National Guidance Documents - PD 6682-1 and PD 6682-9 - and aims to give introductory information only.

Predicting Braking Distance based on the Polished Stone.

Micro-texture of road aggregates wears away under traffic action in the course of time and gets polished. Aggregates resistance to polishingand their ability to maintain the micro-texture are measured in the laboratory by polished stone value PSV. The standard test method for measuring PSV is costly and time consuming.

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