အႀကီးတန္း လိုင္စင္ အင္ဂ်င္နီယာ ေမးခြန္းႏွင့္ အေျဖမ်ား – ဒုတိယအႀကိမ္

ကြၽန္ေတာ္ ဒီစာအုပ္ကို ပထမအႀကိမ္ ထုတ္ေဝေပးခဲ့ၿပီး ျဖစ္ပါတယ္။ ဒါေပမယ့္ အဲဒီစာအုပ္မွာ ေမးခြန္းေလးခုကို မေျဖေပးခဲ့ပါဘူး။ ကြၽန္ေတာ္လည္း အဲဒီအခ်ိန္တုန္းက မသိေသးလို႔ ခ်န္ထားၿပီး ထုတ္ေဝခဲ့ျခင္း ျဖစ္ပါတယ္။ ယခု အႀကိမ္မွာေတာ့ ေမးခြန္းမ်ားကို ျပည့္ျပည့္စံုစံု ေျဖေပးထားၿပီး ထုတ္ေဝလိုက္ပါတယ္။ ပထမ အႀကိမ္မွာ ေျဖမထားတဲ့ ေမးခြန္းေတြကေတာ့ -
= What is black cotton soil?
Black cotton soils are shrinkage soils and it is very difficult to design foundation because the structure erected on such soils crack terribly. Black cotton soil experiences volumetric changes due to changed atmospheric conditions. It swells in wet condition and shrinks in dry atmosphere.
= What is the object of curing?
The object of curing is to prevent loss of moisture from the concrete due to the evaporation and other reasons. The fresh laid concrete should be prevented from direct sun-rays and hot winds to avoid rapid drying. It should also be protected from any type of shocks or stresses due to loads or vibrations.
= What is a water cement ratio?
It is the ratio of water to the quantity of cement used in a concrete or motar mix by volume or weight. Water-cement ratio should be as low as possible so that number of pores is reduced to minimum and thus increasing its durability.
= What are the expansion and contraction joints and why these are necessary?
Due to variations in temperatures, the concrete undergoes expansion and contractions. As such deflection in supports is caused due to expansion and contraction of concrete which may prove fatal to the safety of structure. To avoid this, expansion and contractions joints are provided to the concrete which should be water tight as well as should allow free movement.
ဒီေမးခြန္း ေလးခုပဲ ျဖစ္ပါတယ္။
ဒီ ဒုတိယအႀကိမ္စာအုပ္မွာေတာ့ စာအုပ္ကို ေဒါင္းလုပ္ လင့္ခ္၊ ျဖည့္စြက္စာ နဲ႔ တစ္အုပ္လံုးကို ဓာတ္ပံု လုပ္ၿပီး တစ္ပါတည္း တင္ေပးလိုက္ပါတယ္။ ၿပီးခဲ့တဲ့ စာအုပ္ကို ေဒါင္းလုပ္ လုပ္ၿပီးသူေတြအေနနဲ႔ ယခု စာအုပ္ကို ေဒါင္းလုပ္ လုပ္တာ အဆင္မေျပရင္ အေပၚမွာ တခါတည္း ေျဖထားတဲ့ ေမးခြန္း အေျဖ ျဖည့္စြက္ခ်က္မ်ားကို Screenshot ႐ိုက္ၿပီး သိမ္းႏိုင္ပါတယ္။ ဒါမွမဟုတ္ စာအုပ္ကို ေဒါင္းလုပ္ လုပ္တာ အဆင္မေျပလို႔ ဓာတ္ပံုေတြကို ၾကည့္ၿပီးလဲ Save လုပ္ၿပီး သိမ္းထားႏိုင္ပါတယ္။ ေနာက္ဆံုး အေနနဲ႔ ယခု ဒုတိယအႀကိမ္ ေျမာက္ စာအုပ္ကို ေဒါင္းလုပ္ လုပ္ၿပီး သိမ္းထားခ်င္သူေတြအတြက္ေတာ့ -
http://www.mediafire.com/?s3lqujhbl3yzirb
https://app.box.com/s/42whmaib71k30lms52pa
အေပၚက လင့္ခ္ တစ္ခုခုကေန ေဒါင္းလုပ္ လုပ္ၿပီး သိမ္းထားႏိုင္ပါေၾကာင္း။
အားလံုးပဲ အဆင္ေျပႏိုင္ၾကပါေစ။
#XawLynn