BS 434-2:2006 pdf download.Bitumen road emulsions - Part 2: Code of practice for the use of cationic bitumen emulsions on roads and other paved areas.
4.4 Polymer modified bitumen products
4.4.1 Background
At he time of publication of BS 434—1:1984 almost all bitumen emulsions were produced using paving (penetration) grades of bitumen. A significant change since the initial publication of that British Standard has been the mtro(luction and development of polynwr mo(lified bitumen products, the growing use of which has presented problems of specification.
Initially these products were sold as proprietary products to specifications produced by manufacturers, a situation which leads to confusion with no standard specifications for them. This problem was recognized by the introduction of an assessment and certification scheme for such products under the IIAPAS (highway Authorities Product Approval Scheme) administered by the British Board of Agrément (BBA) which produced a list of tests, including ageing and rheology, against which emulsions can be assessed. If the performance of the emulsion satisfies the requirements of the scheme It is eligible to receive a BBA Roads and Bridges Certiflcate
The testing under this scheme goes beyond the requirements of BS 434-1 in that for surface dressing, for example, it not only requires testing of the emulsion and of the recovered binder from the emulsion (as in 115 EN 13808) but also evidence of two years’ satisfactory performance on the road at a minimum of three appropriate sites.
4.4.1 Background
At he time of publication of BS 434—1:1984 almost all bitumen emulsions were produced using paving (penetration) grades of bitumen. A significant change since the initial publication of that British Standard has been the mtro(luction and development of polynwr mo(lified bitumen products, the growing use of which has presented problems of specification.
Initially these products were sold as proprietary products to specifications produced by manufacturers, a situation which leads to confusion with no standard specifications for them. This problem was recognized by the introduction of an assessment and certification scheme for such products under the IIAPAS (highway Authorities Product Approval Scheme) administered by the British Board of Agrément (BBA) which produced a list of tests, including ageing and rheology, against which emulsions can be assessed. If the performance of the emulsion satisfies the requirements of the scheme It is eligible to receive a BBA Roads and Bridges Certiflcate
The testing under this scheme goes beyond the requirements of BS 434-1 in that for surface dressing, for example, it not only requires testing of the emulsion and of the recovered binder from the emulsion (as in 115 EN 13808) but also evidence of two years’ satisfactory performance on the road at a minimum of three appropriate sites.
