ICC (EC) Soils - Material Testing combined Questions With Verified Answers | UPDATED

ICC (EC) Soils - Material Testing combined Questions With Verified Answers | UPDATED The strength of a soil, or the ability to compact a soil into a suitable construction material will depend on? - ANSWER Soil type Soil density The amount of water in the soil Types of soils - ANSWER Gravel (mm to cm's in size) Sand (mm in size) Silt (fine particles with little cohesion) Clay (has cohesion, can stick together) Organic soils (peat, topsoil) Organic soils (O) - ANSWER Have a large componet of dead or decaying plants, and are not used in construction Silt and Clay - ANSWER Classified based on whether the soil is plastic or non-plastic (eg. can you roll it into a ball) Gravel and Sand - ANSWER are classified based on whether or not all the particle are roughly the same size(uniform, like a beach) or if there is large variety in particle size (well-graded) Soil layers - ANSWER 1. (complex zone) 3 to 4m 2. (glacio-lacustrine clay) 2-12m 3. Glacial till, up to 9m in thickness 4. Carbonate bedrock, the upper surface of which is often fractured, weathers and irrgular Soil has two componets of strength - ANSWER Cohesion (clay only) Friction (when individual soil grains move across on another) Soil fail by - ANSWER shear Soil strength is used to determine - ANSWER The bearing capacity of a foundation The stability of natural or man-made earth slopes or retaining walls Test for soil strength include; - ANSWER unconfined compression test direct shear test Triaxial compression Soil strength depends upon - ANSWER Density and moisture content Unconfined compression test - ANSWER useful for comparing strength of two soils or varion of strength with dept. Gradation refers to the range of measured soil particle sizes. Gradation results in classifying soil as? - ANSWER Gravel ( > 2 mm) Sand (between 0.075 and 2 mm) Silt (0.002 to 0.075 mm) Clay (< 0.002 mm) The particle size distribution of coarse-grained soils is typically determined by? - ANSWER Mechanical sieve analysis The particle size distribution of fine-grained soil is determined using a ? - ANSWER hydrometer analysis Two parameters help to identify soils that are well-graded? - ANSWER The Coefficient of Uniformity (Cu) The Coefficient of Curvature (Cc) The hydrometer analysis is used to determine the gradation of - ANSWER slit and clay-sized particles. Only soil particles passing the No. 40 sieve(0.425) are used in the - ANSWER hydrometer analysis Hydrometer readings give us two things? - ANSWER The specific gravity, or density, of the fluid tells us the % of material is still in suspension. The average downward velosity of the hydrometer can give us the diameter of the particle hat is just coming out of solution. The Swedish soil scientist, _____developed a method of quantitatively describing the effect of soil moisture on the consistency of fine-grained soils. - ANSWER Atterberg, Although Atterberg proposed five limits only the following three are in common useage today. - ANSWER Liquid Limit Plastic limit Shrinkage limit Only the Liquid Limit and Plastic Limit are normally used to? - ANSWER classify soil plasticity It is important to remember that all values related to the Atterberg limits are simply? - ANSWER moisture content values. moisture content = - ANSW