The SROH 3rd Edition referred to the MCHW for the use of HBMs outside the requirement for the A9 trial approval process. The MCHW does not give specific provision for HBMs within street works so appendix A10 has been created to directly call up the requirements from BS EN 14227 for this purpose.
Requirements contained in A10 for HBMs aim to be equivalent to that for bituminous and concrete products. This includes a quality control, inspection and testing. Hand mixed and other forms of production that do not meet these requirements can be progressed via the pre-existing A9 approval trials.
