_____ best describes the condition for exterior beams with some freezing exposur
ID: 1710184 • Letter: #
Question
_____ best describes the condition for exterior beams with some freezing exposure not exposure exposed to wet soil. a. Neglible exposure b. Mild exposure c. Moderate exposure d. Severe exposure _____ blows on each corresponds to the heavy traffic level in the Marshall mix design (number of blows on each side of specimen using Marshall compactor). a. 35 b. 50 c. 75 d. 100 _____ among the carbon steels has the highest carbon content. a. Extra soft grade b. Spring grade c. Medium hard grade d. Tool steel The basic _____ furnace has a large pear-shaped vessel lined with refractory material. a. blast b. oxygen c. electric arc d. induction _____ is/are produced by bounding thin wood veneers together into a large billet with the grain of all veneers parallel to the long direction a. Plywood-lumber beams b. Laminated veneer lumber c. Glued laminated wood member d. Parallel strand lumberExplanation / Answer
17) Option D: Severe Exposure;
Severe Exposure Condition: Concrete surfaces exposed to severe rain, alternate wetting and drying or occasional freezing whilst wet or severe condensation.
Mild Exposure Condition: Concrete surfaces protected against weather or aggressive conditions, except those situated in coastal area.
Moderate Exposure Condition: Concrete surfaces sheltered from severe rain or freezing whilst wet, Concrete exposed to condensation and rain, Concrete in contact or buried under non-aggressive soil / ground water.
There is no negligible exposure condition for concrete.
18) 75 blows on each side (Option C)
The typical number of blow on each side is either 50 or 75, depending on the expected traffic volume on the road where the mix is intended to be used. Hence 75 blows corresponds to the heavy traffic level in marshall mix design.
19) Tool steel has the highest carbon percent varies from 1.05 to 1.2 (Option D).
a) Extra soft grade steel also called as dead soft steel has 0.08 – 0.18%. This type of steel is characterized by ductility, toughness, weldability and is used where cold-workability is needed. Also used where stiffness is not important.
b) Spring grade steels have 0.85 – 1.05% carbon. These are medium-to-high carbon content alloys.
c) Medium hard grade steel has 0.35 – 0.65% carbon.
d) Tool steel’s carbon percent varies from 1.05 to 1.2. It refers to a variety of carbon and alloy steels that are particularly well-suited to be made into tools. Their suitability comes from their distinctive hardness, resistance to abrasion and deformation and their ability to hold a cutting edge at elevated temperatures
20) Option A; The blast furnace is a huge and has large pear shaped steel stack lined with refractory brick, where iron ore, coke and limestone are dumped into the top, and preheated air is blown into the bottom. The purpose of a blast furnace is to chemically reduce and physically convert iron oxides into liquid iron called "hot metal".
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