CA2674 Construction Materials
Sem A, 2022 – 2023
Mid-term Exam
Student Name: Student ID:
Note: This exam consists of two questions and allows 70 minutes to complete.
Question 1
For each question below, clearly write down the letter of the only correct answer in
front of the question number. [1 marks × 12 = 12 marks]
1) Which of the following combination of chemical compounds is the correct one mainly
responsible for the initial setting and long-term strength development of the cement paste,
respectively?
a) C3S and C2S
b) C3A and C3S
c) C3A and C2S
d) C3S and C4AF
2) The Low-heat Portland Cement has which of the following characteristics?
a) Relatively higher C3S and C3A content, and lower C2S content
b) Relatively higher C3S and C2S content, and lower C3A content
c) Relatively lower C3S and C2S content, and higher C3A content
d) Relatively lower C3S and C3A content, and higher C2S content
3) The flash set of the cement paste can be avoided by adding which of the following
substance?
a) Pozzolan
b) Gypsum
c) Ettringite
d) Calcium Chloride
4) The BS sieve size range for fine aggregates is between
a) 10 mm and 5 mm
b) 10 mm and 75 µm
c) 5 mm and 150 µm
d) 5 mm and 75 µm
5) Which of the following statements about accelerator is NOT correct?
a) It is used to accelerate the development of early strength of concrete
b) Calcium chloride is a most common type of accelerator
c) It promotes the C2S hydration but slows down the C3A hydration
This study source was downloaded by 100000790564822 from CourseHero.com1on 09-10-2025 01:43:50 GMT -05:00
https://www.coursehero.com/file/217826514/CA2674-mid-termexam-SemA-2022-2023pdf/
Sem A, 2022 – 2023
Mid-term Exam
Student Name: Student ID:
Note: This exam consists of two questions and allows 70 minutes to complete.
Question 1
For each question below, clearly write down the letter of the only correct answer in
front of the question number. [1 marks × 12 = 12 marks]
1) Which of the following combination of chemical compounds is the correct one mainly
responsible for the initial setting and long-term strength development of the cement paste,
respectively?
a) C3S and C2S
b) C3A and C3S
c) C3A and C2S
d) C3S and C4AF
2) The Low-heat Portland Cement has which of the following characteristics?
a) Relatively higher C3S and C3A content, and lower C2S content
b) Relatively higher C3S and C2S content, and lower C3A content
c) Relatively lower C3S and C2S content, and higher C3A content
d) Relatively lower C3S and C3A content, and higher C2S content
3) The flash set of the cement paste can be avoided by adding which of the following
substance?
a) Pozzolan
b) Gypsum
c) Ettringite
d) Calcium Chloride
4) The BS sieve size range for fine aggregates is between
a) 10 mm and 5 mm
b) 10 mm and 75 µm
c) 5 mm and 150 µm
d) 5 mm and 75 µm
5) Which of the following statements about accelerator is NOT correct?
a) It is used to accelerate the development of early strength of concrete
b) Calcium chloride is a most common type of accelerator
c) It promotes the C2S hydration but slows down the C3A hydration
This study source was downloaded by 100000790564822 from CourseHero.com1on 09-10-2025 01:43:50 GMT -05:00
https://www.coursehero.com/file/217826514/CA2674-mid-termexam-SemA-2022-2023pdf/
