f a rock are described as follows: unconfined 37. The engineering properties o v
ID: 284926 • Letter: F
Question
f a rock are described as follows: unconfined 37. The engineering properties o varnable and unpredictable in terms of foundatice properties. This rock is a. (a) Basalt (b) Madstone (c) Limestone (d) Conglomerate (e) Granite compressive strength increases with age. The rock is a very efficient aquifer, very minerals expand significarsly when exposed to water and can thus cause tor engineers. Although both are 2:1 type clays (T -O-T minerals), Smectite 38. Certain clay shows this swelling behaviour but Illite does not. Why? (a) hilite has a layer of potassium sons bonding the tetrabedral (T) sheets of neighbouring (b) Inlite has a hydroxide sheet bonding the tetrahedral (T) sheets of neighbouring clay (c) llite has neighbouring octahedral (O) sheets only, and these do not attract water (d) Illite neutralises the bipolar character of water molecules (e) Smectite has coarser minerals and can better accommodate the relatively large water clay mincrals minerals molecules 39. The weathering products of a certain type of rock include quartz as a residual mineral and caleium ions. Which of the following statements is true? (a) The rock could be limestone, but not granite or basalt. (b) The rock could be basalt, but not granite or limestone. (c) The rock could be granite, but not limestone or basalt (d) The rock could be granite, basalt or limestone. (e) The rock could not be granite, limestone or basalt. Page 14 of 18Explanation / Answer
37.d, conglomerate: high porosity and permiabilaty makes them good quality aquifers, but are reverine sediments, makes them unstable
38. a. illites has pottasium ions, the space betwwen every crystalis occupied by pottassium ions, which explains the swelling.
39. d. The rock may be basalt, limestone or granite
because: granite may give up silica
limestoe may give up calcite
amygaloidal basaltmay give up both.
36. e granite: granit has a safe bearing capacity of 3300 Kn/m2 and has feldspars succeptable to clay formation
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.