Q1). Answer the followings:-What are the major compounds in Portland cement?2-The rate of hydration decreases continuously with time, why?3-How can the progress of hydration of cement be determined?4- List and explain factors that affecting the setting of Portland cement.5- What is relationship between aggregate surface texture and concretestrength?6- What are the factors governing the selection of maximum aggregate size?7-List and explain factors that affecting the workability of fresh concrete.8- What are the most effective means in reducing concrete bleeding?9- What are the difficulties in hot weather concreting?10-What is the purpose of trial mixes in a mix design of concrete?

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Answered: Q1). Answer the followings: -What are…

Q1). Answer the followings: -What are the major compounds in Portland cement? 2- The rate of hydration decreases continuously with time wh

Structural Analysis

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ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

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Question

100%

Q1). Answer the followings:
-What are the major compounds in Portland cement?
2-The rate of hydration decreases continuously with time, why?
3-How can the progress of hydration of cement be determined?
4- List and explain factors that affecting the setting of Portland cement.
5- What is relationship between aggregate surface texture and concrete
strength?
6- What are the factors governing the selection of maximum aggregate size?
7-List and explain factors that affecting the workability of fresh concrete.
8- What are the most effective means in reducing concrete bleeding?
9- What are the difficulties in hot weather concreting?
10-What is the purpose of trial mixes in a mix design of concrete?

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8) For the following cements, answer the following questions: Cement A Cement B C3S (%) C2S (%) СЗА (%) Alkalis (%) SO3 (%) CaCO3 (%) Blaine fineness (m²/kg) Loss on ignition (%) Insoluble residue (%) *Other aspects of the cements are comparable to each other. 60 50 15 20 10 6 1 1 2.5 2.5 5 1 350 300 0.01 0.75 3 0.1 a) Which cement has high early strength? Briefly explain. b) Which cement would you use in an emergency repair? Briefly explain. c) Which cement would you use in a small retaining wall during a hot summer? Briefly explain. d) Which cement has higher sulfate resistance? Briefly explain. e) Which cement is stored improperly? Briefly explain f) During the production of which cement, the kiln reactions were almost complete? Briefly explain
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Q2- A concrete mix of old C(1: 1.5 : 3/0.5) (by weight) is used for casting in cold weather. Calculate: 1. The temperature of fresh concrete. 2. The temperature of heated mixing water if it is required to use to meet the specification requirements in Cold Weather (60 °F ). Assume: S.G. of aggregate = 2.65. Te = 25 °F, Ta = Tm = 20 °F
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