Soils exam review questions with 100% Correct Answers Success Guaranteed.

compaction and consolidation - correct answer Extrudes the water Compaction effects - correct answer Increase soil shear strength, decrease future settlement, decrease permeability By using the dry unit weight of soil - correct answer Calculate compaction Water for compaction - correct answer Acts as a Lubricant. Too much of it means lesser density. At optimum moisture content (also known as maximum dry unit weight) - correct answer Best compaction is when To find what your projects maximum dry unit weight should be - correct answer Why compaction is important Compaction tests - correct answer ASTM D698 and ASTM D1557 ASTM D 698 - correct answer Standard proctor test A sandy soil has a total unit weight of 100 pcf and a specific gravity of solids of 2.60, and a water content of 10 percent. Find dry unit weight - correct answer Yd=Ws/V=Y/(1+w)=100/1.10=90.9pcf Why do we need modified the modified proctor test? - correct answer To try and get hugger density Compaction has no effect on it - correct answer Water content Water content only has effect on these - correct answer Air and water Dry unit weight Yd - correct answer On the y axis Moisture content w - correct answer On x axis Zero air void unit weight verifies it - correct answer Proctor test AASHTO System - correct answer Heavy and highway work USCS - correct answer Preferred by by geotechnical engineers and used by federal agencies AASHTO classification system - correct answer Grain size analysis, liquid limit, plasticity index Highway construction uses this classification system - correct answer AASHTO The maximum thickness for compaction is how many inches? - correct answer 8 Inches particles larger than 3" need to be removed - correct answer This is so that compaction will work If PI is greater than 20 then what needs to happen? - correct answer It needs to be approved because there is a lot of clay in it From semi-solid state to Plastic state - correct answer Plastic limit From plastic state to liquid state - correct answer Liquid limit Plastic state - correct answer Atterburg Plastic index limit 4 types of soil - correct answer Gravel, sand, silt, clay Optimum moisture content - correct answer The water content at which the greatest density of a soil can be obtained Pass - correct answer A working passage(trip) of an excavating, grading, or compaction machine Plasticity - correct answer The capability of being molded USCS - correct answer Developed by casagrande and used by corps of engineers 3 groups of soils subdivided into 15 subgroups - correct answer Coarse-grained, fine-grained, highly organic soils G - correct answer Gravel O - correct answer Organic W - correct answer Well graded S - correct answer Sand PT - correct answer Peat P - correct answer Poorly graded M - correct answer Silt C - correct answer Clay USCS was standardized - correct answer In 1929 as the Unified Classification System In USCS we only consider these soils - correct answer course grained and fine grained soils D50 - correct answer Median average particle size D10 - correct answer Effective size If Cu is 1 - correct answer Then all particles are the same size Cu= - correct answer D60/D10 Cc - Coefficient of Curvature - correct answer Indicates the smoothness and shape of the gradation curve