Recently there has been an increasing use of cements containing pozzolanicmaterials as a means of limiting premature deterioration of concretestructures.(a)Describe three (3) pozzolanic materials that are being usedincreasingly by the construction industry as partial replacement forPortland cement in concrete?(b) If you were to choose a blended cement for a concrete structure in amarine environment, which of the choices below would you chooseand why?10% Slag60% Slag90% Slag90% OPC1.40% OPC1.10% OPC(c) From the knowledge of the effects of GGBS, PFA and microsilica,indicate whether their inclusion to provide a concrete of equivalent 28day strength, is likely to enhance or reduce resistance to each of theprocesses stated belowsi.AlkSilica Reaction (ASR) in concreteChloride ingress in concrete (not corosion)11CS Scanned with CamScanner

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(a) Describe three (3) pozzolanic materials that are being used increasingly by the construction industry as partial replacement for Portland cement in 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

Recently there has been an increasing use of cements containing pozzolanic
materials as a means of limiting premature deterioration of concrete
structures.
(a)
Describe three (3) pozzolanic materials that are being used
increasingly by the construction industry as partial replacement for
Portland cement in concrete?
(b) If you were to choose a blended cement for a concrete structure in a
marine environment, which of the choices below would you choose
and why?
10% Slag
60% Slag
90% Slag
90% OPC
1.
40% OPC
1.
10% OPC
(c) From the knowledge of the effects of GGBS, PFA and microsilica,
indicate whether their inclusion to provide a concrete of equivalent 28
day strength, is likely to enhance or reduce resistance to each of the
processes stated belows
i.
Alk
Silica Reaction (ASR) in concrete
Chloride ingress in concrete (not corosion)
11
CS Scanned with CamScanner

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