Bomb Crater Repair Techniques for Permanent Airfields. Report 2. Series 2 and 3 Tests.

Abstract : This study is a continuation of Reports 1 and 2 of this series which described Series 1, 2, and 3 tests, which were performed using different field methods of repairs and restoration of bomb craters. Results from these tests showed problem areas that needed correction when the crater repairs were trafficked with full-scale loading. Series 4 tests were run to determine (a) a way to place grout with a minimum of equipment and verify thickness requirements, (b) whether a poor-quality material could be stabilized with high early-strength cement and trafficked early, (c) whether the loose stone problem (foreign object damage (FOD)) encountered with the well-graded crushed limestone could be corrected with a cap of neat grout placed over the limestone, and (d) whether an asphalt with an indefinite storage life could be used for the binder in surface treatments and to obtain additional data with surface treatments as a possible solution for the loose stone problem (FOD) encountered with the crushed limestone. Testing was by accelerated traffic using single- and multiple-wheel gear assemblies. (Author)