BS 9228:2021 pdf download

BS 9228:2021 pdf download.Recycling of roads and other paved areas using bitumen emulsion, foamed bitumen or hydraulic material — Materials, production, installation and product type testing — Speci ication
1 Scope
This British Standard specifies requirements for materials processed with either bituminous emulsion, foamed bitumen or hydraulic material, including their design and composition, production, installation and performance testing. This British Standard includes requirements for mixtures prepared using bituminous binders that may also contain hydraulic material. This British Standard describes a number of processes and methods by which existing material in the road or other paved areas is either processed in-situ or uses recycled material processed ex-situ. NOTE 1 BS 9227 specifies requirements for the production, installation, testing and conformity of hydraulically bound materials (HBM) conforming to BS EN 14227 Parts 1 to 5 for pavement applications, whether constructed by the ex-situ or in-situ methods. It also includes requirements for preliminary work at the laying site, needed to ensure that the substrate is fit to receive the HBM. BS 9227 includes only materials conforming with BS EN 14227 Parts 1 to 5 whether from recycled or virgin materials. For the recycling of pavements, TRL Report TRL 611 [1] can be used. NOTE2 BS EN 13108-31 specifies requirements for asphalt concrete using aggregate conforming to BS EN 13043 and bituminous emulsion for use on roads, and other trfficked areas. NOTE 3 Guidance on the selection and use of cold recycled materials is given in Annex A.
5.8 Application and incorporation of emulsion
Following the harrowing, grading and shaping process masking shall be applied to any features not to be contaminated with bitumen, e.g. gullies and ironwork. A bitumen emulsion conforming to BS EN 13808:2013 Class C55 B(F)3/4/5 or C60 B(F)3/4/5 shall be applied by tanker sprayer in two or three applications, depending upon whether additional material is imported and incorporated up to 125 mm thickness, at an individual rate of 2 l/m2 to 2.5 l/m2. NOTE 1 This might need to be adjusted accordingly when high or low volume of binder content is evident from the site inspection. The first application of bitumen emulsion shall be harrowed to distribute the emulsion to the full depth. Any disturbance of levels shall be rectified with a grader before compaction. The surface shall then be rolled again. NOTE 2 The second application of bitumen emulsion is required where additional aggregate has been spread on the surface and harrowed in. The first and second applications of bitumen emulsion shall be followed by harrowing to the full depth of up to 125 mm, as applicable. . A further application of bitumen emulsion shall be applied followed by the application of 8/14 mm chippings. The rate of spread of the chippings shall fully close surface voids. NOTE3 A rate of spread of 14 kg/m2 to 18 kg/m2 has been found suitable.