CIVE 2700 Quiz 3 (Lec 17-23)

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CIVE 2700 Quiz 3 (Lec 17-23) Matrix component is more flexible and ductile than the fibre component. True or False? - ✔✔True It is possible to produce a polymer that is 100% crystalline. True o... r False? - ✔✔False. Polymers are rarely 100% crystalline. It is difficult for all regions of all chains to become aligned. Rutting causes cracks on the pavement surface due to low temperatures. - ✔✔False. Rutting is depression which develop in the wheel tracks of asphalt pavement. Thermal cracking results from shrinkage of the HMA surface due to low temperatures or asphalt binder hardening. What type of bonding is found in hydrocarbon molecules? - ✔✔Covalent bonding Thermal cracking results from shrinkage of the HMA surface due to high temperatures. - ✔✔False. Thermal cracking results from shrinkage of the HMA surface due to low temperatures or asphalt binder hardening. Asphalt cement is also called... - ✔✔Asphalt binder & Asphalt cement concrete One advantage of masonry construction is: - ✔✔Less formwork required as compared to concrete Chemical weathering - ✔✔decomposition due to oxidation, reduction, carbonation, and other chemical processes Liquefaction - ✔✔strength and stiffness of a soil is reduced by earthquake shaking or other rapid loading, and soil transforms from solid state to liquid state Physical weathering - ✔✔erosion from freeze & thaw, abrasion from glaciers, activity of plants and animals Continuous fibre is good only in one direction (makes composite anisotropic). True or False? - ✔✔True Wood is a natural composite of cellulose fibres (Cell walls) and lignin (glue). True or False? - ✔✔True To seal large cracks on asphalt pavement surface, a fog seal is applied on the surface. True or False? - ✔✔False. Fog seals are a light application of diluted asphalt emulsion to the surface of an oxidized pavement surface. They preserve existing pavement. Crack sealing is used to seal large cracks. By deforming a polymer, its strength increases due to amorphous chains straightening. True or False? - ✔✔True. Load-bearing concrete structural frame - ✔✔The loads are carried and transferred through the reinforced concrete beams and columns to the foundation Masonry building - ✔✔the loads are transferred to the load-bearing walls, and then transferred to foundation A polymer is a large chain molecule with a high molecular mass on the order of several thousands g/mol. True or False? - ✔✔True Mortar is a mixture of cementitious material, ______________, and _______________. - ✔✔Mortar is a mixture of cementitious material, fine aggregate, and water. Well graded - ✔✔Gradation curve is generally smooth Poorly graded - ✔✔Most of the particles about the same size Gap graded - ✔✔A proportion of grain sizes within a specific range is low. What polymer type is more amenable to recycle? - ✔✔Thermoplastic Organic soils - ✔✔Weak and deform excessively under load Gravel, sands, and silts - ✔✔Cohesionless and non-plastic Clays - ✔✔Cohesive and plastic Reasons of landslide of soils - ✔✔1. weakening of a slope through saturation by heavy rains 2. loss of absence of vertical vegetative structure 3. erosion of the toe of a slope by rivers or ocean waves 4. destabilizing ground water pressure What is grout? - ✔✔1. Used for filling the voids in masonry units 2. High-slump concrete consisting of Portland cement, sand, fine gravel, water, and sometimes lime 3. Used for increasing fire resistance in the voids in masonry units What are the combinations of soil? - ✔✔Air Solid Particles Water What type of soil failure shows bumpy roads? - ✔✔Frost heave FRP reinforcement is more susceptible to corrosion than conventional steel reinforcement. True or False? - ✔✔False FRP has an immunity to corrosion in addition to having a low weight. It also has a high tensile strength. In composite materials, the dispersed phase is generally softer than the matrix phase. True or False? - ✔✔False. The dispersed phase is generally harder and stiffer than the matrix phase. [Show More]

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