please answer both questions, thanks. High alumina cements characteristics are: Choose the wrong answers?ereSelect one or more:a.cheapthe nextO b. Retain strength at higher temperatures than Portland cement whichbreaks down at temperatures above 485°C.C.Superior resistance to seawater and sulphate-bearing groundwaterE d. Generally high final strengthsO e. High early strength (and heat evolution) Type D (sulphate- resisting) cement major componentveliof eleSelect one:a.СЗАer orerlaene cwhesheO b.CAAFO c.C25O d.C3S

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Answered: High alumina cements characteristics…

Materials Science And Engineering Properties

1st Edition

ISBN:9781111988609

Author:Charles Gilmore

Publisher:Charles Gilmore

Chapter12: Composite Materials

Section: Chapter Questions

Problem 27CQ

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This refers to a change from liquid state to solid state of cement paste.
Rate of Tricalcium silicate (C3S) is higher in Type III cement.
5 - Why dolomitic aggregate is not preferred in concrete.A) Increases the vacancy rate.B) It creates expansion.C) AllD) Because it is inertE) Increases permeability.
Which compound of cement is responsible for strength of cement? a. Magnesium oxide b. Silica c. Alumina
Although the constituents of concrete (aggregate and hydrated cement paste) behave in a linear elastic manner if stress is applied to them and the resulting strain is measured, concrete is not a linear elastic material throughout its entire stress-strain curve. What is the main reason for the deviation from this behavior? Interfacial transition zone (ITZ) Incomplete hydration of cementitious phases The loading rate applied according to ASTM C 39 presence of C-S-H very close to the aggregate/paste interface
7 - Which of the following cements is cement with at least 50% slag density and is suitable for use in mass concrete.A) CEM VB) CEM IVC) CEM ID) CEM IIE) CEM III
What is the weakest property of concrete? The compressive strength of the coarse aggregate The compressive strength of the cement paste The bond between the cement paste and the aggregate The shear strength of the coarse aggregate
Concrete is required for a column that will be Severe exposed to freezing and thawing. The cross section of the column is 300 × 300 mm. The smallest spacing between reinforcing steel is 30 mm. The Required Average Compressive Strength of concrete at 28 days is 35 MPa with a slump of 80 to 100 mm. The properties of materials are as follows: ❖ Cement used is type I Portland cement with a specific gravity of 3.15. ◆ The available coarse aggregate has a maximum size of 23 mm, a dry-rodded unit weight of 1800 kg/m3, a bulk specific gravity (SSD) of 2.7, absorption capacity of 0.55%, and moisture content (SSD) of 0.25%. The fine aggregate has a bulk specific gravity (SSD) of 2.75, absorption capacity of 1.4%, a moisture content (SSD) of 2.5%, and a fineness modulus of 2.70. The aggregates conform to the ASTM C33-84 requirements for grading.
Concrete is required for a column that will be moderately exposed to freezing and thawing. The cross section of the column is 300 × 300 mm. The smallest spacing between reinforcing steel is 30 mm. The specified compressive strength of concrete at 28 days is 40 MPa with a slump of 80 to 100 mm. The properties of materials are as follows: ❖ Cement used is type I Portland cement with a specific gravity of 3.15. ◆ The available coarse aggregate has a maximum size of 23 mm, a dry-rodded unit weight of 1800 kg/m3, a bulk specific gravity (SSD) of 2.7, absorption capacity of 0.55%, and moisture content (SSD) of 0.25%. The fine aggregate has a bulk specific gravity (SSD) of 2.75, absorption capacity of 1.4%, a moisture content (SSD) of 2.5%, and a fineness modulus of 2.70. The aggregates conform to the ASTM C33-84 requirements for grading.
20 - Which of the following does not occur if the material under 63 micron exceeds 4% in the aggregate.A) The need for water increases.B) Workability increases.C) No problem occurs.D) Strength decreases.E) The need for cement increases.
Reinforced concretes are usually attacked by water and rusted. This is due to, a. Low density cements or high porosity that allow water to reach the steel b. The expansion of the rust as it has higher volume than steel push the cement cover and break it c. All the options d. None of the options e. The cover thickness is too small (the steel is too close to the end of the concrete block)
i. How and why do we test compressive strength? ii. What does it tell us about the mix iii. What is expected to happen over time as we are testing

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