this report is concerned with the evaluation of the factors which control the low-speed skidding resistance of concrete. these influence the microtexture of the surface as distinct from the coarse scale roughness or macrotexture which is superimposed in order to improve skidding resistance at high speeds. an analysis of results obtained from two core-insert experiments has been made to identify the material factors influencing the skidding characteristics of concrete as measured by the portable skid-resistance tester. multiple regression equations have been derived which can be used to predict skid-resistance values of concrete under heavy traffic conditions, provided that the fine aggregate properties can be defined by tests on samples of similar coarse aggregate. the fine aggregate is the most important constituent of a mix and should have high resistance to abrasion as well as high resistance to polish for the parent concrete to maintain high values of skidding resistance. other factors also have been identified but their influence is relatively minor. in the main, the findings obtained from this study, of concretes trafficked and measured under normal road conditions, agree with previous findings obtained from accelerated laboratory tests. (a)

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