40. Vibration can increase the bulk density of Portland Cement. T or F 41. Air entrainers produce tiny bubbles in the cement paste which crush upon freezing and decrease the strength of concrete. T or F 42. Aggregates with low strength has no impact on the ultimate strength of cement or asphalt. T or F 43. The design of concrete is the responsibility of civil engineers. T or F 44. Waste water from ready-mixed plants is a hazardous substance and cannot be reused for mixing new concrete. T or F Portland Cement is named after the bauxite & chalk cliffs on the Isle of Port Antonio, where it was first made in the early 1800s. 45. T or F T or F Air entrainers produces tiny bubbles in the concrete and reduces, the stress in concrete in freezing climates. 46. T or F Air entrainers improves workability and increases strength by about 20%; however, it can be compensated by increasing the wc ratio. 47. T or F Properties of aggregates include shape and texture, soundness, toughness, absorption, specific gravity, strength and modulus, gradation, deleterious materials and eleanness, alkaline reactivity, and affinity for asphalt. 48. DFocus

40. Vibration can increase the bulk density of Portland Cement. T or F 41. Air entrainers produce tiny bubbles in the cement paste which crush upon freezing and decrease the strength of concrete. T or F 42. Aggregates with low strength has no impact on the ultimate strength of cement or asphalt. T or F 43. The design of concrete is the responsibility of civil engineers. T or F 44. Waste water from ready-mixed plants is a hazardous substance and cannot be reused for mixing new concrete. T or F Portland Cement is named after the bauxite & chalk cliffs on the Isle of Port Antonio, where it was first made in the early 1800s. 45. T or F T or F Air entrainers produces tiny bubbles in the concrete and reduces, the stress in concrete in freezing climates. 46. T or F Air entrainers improves workability and increases strength by about 20%; however, it can be compensated by increasing the wc ratio. 47. T or F Properties of aggregates include shape and texture, soundness, toughness, absorption, specific gravity, strength and modulus, gradation, deleterious materials and eleanness, alkaline reactivity, and affinity for asphalt. 48. DFocus

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A concrete mix has a ratio os 1:2:4 by mass. The properties of the materials to be used are tabulated below. MATERIALS. SPECIFIC GRAVITY CEMENT 3.33 SAND 2.65 GRAVEL 2.67 Cement weighs 40 kg per bag. Use 24 liters of water per bag of cement Compute the volume of cement solids per bag of cement in cu m. Compute for the required volume of sand solids per bag of cement. Compute for the volume of concrete that can be produced per bag of cement 0.1 Need answer until 8 pm. Guaranteed like for a detailed complete solution.
Given cement compounds: C3A = 7.3% C4AF = 12.2% C3S = 48.4% C2S = 29.7% What should be made in terms of sourcing raw materials if the manufacture wants to produce a Sulphate Resisting Portland Cement? Compare and contrast between Ordinary Portland Cement and Sulphate Resisting Portland Cement.
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The table below shows the properties of materials required to design a concrete mix. It is required to:a- Make a complete mix design.b- Express the proportions by volume for water, coarse aggregate, and fine aggregate, knowning that weight of 1 m3 gravel = 1760 kg/m3 and weight of 1 m3 sand = 1600 kg/m3.c- From the designed mix it is required to make a trial mix enough for six standard cubes (15 cm x 15 cm x 15 cm), six standard cylinders (d = 15 cm, h = 30 cm), and three standard beams (15 cm x 15 cm x 70 cm). what are the proportions of this mix? Using BSI Method only
11) The oxide compositions of two Portland cements are given in Table 1. a) Calculate the potential compound compositions of the Portland cements, the oxide compositions of which are given in Table 1. b) Determine (and explain) the most suitable Portland cement for the following applications: i. Concrete pipe exposed to sewage attack ii. Emergency repair iii. Mass concrete c) Considering the heats of hydration of the four main clinker compounds, estimate the total heat of hydration of PC1 and PC2. Table 1 Oxide (%, by mass) СаО (С) SiO2 (S) Al2O3 (A) Fe2O3 (F) SO3 (Š) Other PC1 PC2 66.2 63.2 20.7 23.4 6.4 4.9 3.1 5 2 1.6 1.5 Hint: %C3S = 4.071×C - 7.6xS - 6.718XA - 1.43×F - 2.852x5 %C2S=2.867×S - 0.7544×C3S %C3A=2.650×A - 1.692×F %C4AF=3.043×F
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