History of Concrete 1

What are Portland cements primarily composed of?

• Organic compounds that set and harden by reacting chemically with water.

• Hydraulic calcium silicates that set and harden by reacting chemically with water.

• Inorganic non-metallic substances that do not react with water.

• Simple lime-based compounds that do not require chemical reactions to set.

How was the development of Portland cement described in the text?

• As a result of accidental discovery during routine construction work.

• As a result of persistent investigation by science and industry to produce a superior quality natural cement.

• As a byproduct of another industrial process unrelated to cement production.

• As an ancient material that has been used for centuries without modification.

Why was Portland cement named 'Portland'?

• After the inventor's hometown

• After the Isle of Portland in the English Channel

• After the Portland family, who were patrons of the inventor

• After the city of Portland, Oregon

Which of the following is NOT a primary component necessary for Portland cement manufacture?

• Calcium

• Silica

• Alumina

• Carbon

What is one of the primary components necessary for Portland cement manufacture that contributes to its strength development?

• Sodium

• Silica

• Potassium

• Magnesium

What are the raw materials used in the manufacture of Portland cement according to the image?

• Limestone, cement rock, and shale

• Limestone, cement rock, shale, clay, sand, or iron ore

• Limestone and sand only

• Cement rock and iron ore only

What is the first size reduction of stone in the modern dry-process of manufacturing Portland cement?

• To 20 mm size

• To 125 mm size

• To 50 mm size

• To 10 mm size

After the first reduction, to what size is the stone further reduced in the modern dry-process of manufacturing Portland cement?

• To 20 mm size

• To 125 mm size

• To 50 mm size

• To 10 mm size

How are the raw materials stored after being conveyed in the modern dry-process of manufacturing Portland cement?

• Mixed together in a single storage unit

• Stored separately for each raw material

• Stored based on their size

• Stored outdoors without any cover

What is the purpose of high-pressure grinding rolls in the cement manufacturing process?

• To proportion raw materials

• To collect dust

• To blend the powder

• To grind in conjunction with a ball mill