The surface vibration compaction test

indoor heavy compaction test

interior California bearing ratio(CBR) test and modulus of resilience test have been carried out on sericite schist coarse aggregates and four modified soils

because the sericite schist belong to the soft rock

strength low

which is easy to make road collapse and pavement cracking when it as subgrade filling material. Test results shows that it is a big difference in the maximum dry density of sericite schist coarse aggregates by using heavy compaction test in contrast to the surface vibration compaction test. The results of maximum dry density is 2.01 g/cm3 by using heavy compaction test; but another is 1.92 g/cm3. The main reason is that due to particle breakage in sericite schist. The effects of the change of the optimum moisture content is not obvious for sericite schist coarse aggregates

as well as for four modified soils

which is beneficial to compaction. The modulus of resilience of sericite schist coarse aggregates is low

less than 32 MPa. However the modulus of resilience of modified soil have been remarkable improved

up to 50 MPa above all. The CBR both only have 3.7 when blend it with 20% red sandstone or 20% clay. But the CBR ascends obviously when to mix it with 3% or 5% cement. Sericit schist after chemical modification by adding 3%

5% of cement can be used in the embank kment of highway 94 zone and 96 zone.