Q1) Read the following sentences, write true or false, and correct the sentences that are false: - 1-Iraqi specification No. 5 limited max SO3 in Portland cement by 1.5% when C4AF< 5%, and by 3% when C 4AF > 8%. L 2-The actual value of the heat of hydration depends on water cement ratio. X 3- The alkali silica reaction is very fast, happen between active silica in the cement and the alkalis in aggregate. کے 4- Sulphate in mixing water should not be more than 10,000 ppm. 5- Higher curing temperature decrease earlier strength, but it increases 28-day strength of concrete.

Q1) Read the following sentences, write true or false, and correct the sentences that are false: - 1-Iraqi specification No. 5 limited max SO3 in Portland cement by 1.5% when C4AF< 5%, and by 3% when C 4AF > 8%. L 2-The actual value of the heat of hydration depends on water cement ratio. X 3- The alkali silica reaction is very fast, happen between active silica in the cement and the alkalis in aggregate. کے 4- Sulphate in mixing water should not be more than 10,000 ppm. 5- Higher curing temperature decrease earlier strength, but it increases 28-day strength of concrete.

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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Concept explainers

Types of Cement

Cement is a fine mixture of limestone, chalk, or marl and clay which when mixed with water, becomes compacted due to the formation of strong molecular bonds. Due to hydration, cement turns into a hard mass when left for a sufficient amount of time upon mixing with water. The water turns the cement compounds into gel-like submicroscopic particles having higher surface areas. It is due to the hydration properties of cement, they are often known as hydraulic cement. For instance, Portland cement is a popular example in this category.

Question

Q1) Read the following sentences, write true or false, and correct the sentences that
are false:-
1-Iraqi specification No. 5 limited max SO3 in Portland cement by 1.5% when
C4AF< 5%, and by 3% when C 4AF > 8%.
2-The actual value of the heat of hydration depends on water cement ratio. X
3- The alkali silica reaction is very fast, happen between active silica in the cement
and the alkalis in aggregate.
4- Sulphate in mixing water should not be more than 10,000 ppm.
5- Higher curing temperature decrease earlier strength, but it increases 28-day
strength of concrete.
Call wings: [5M]

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