Lecture 3

Question 1

What is cement

Answer 1

a powdery substance made with calcined lime and clay

Question 2

what is portland cement

Answer 2

cememnt that is manufactured from limestone and clay that hardens underwater, from the isle of portland in the uk. Fathered by joseph aspdin

Question 3

In calcination

Answer 3

you heat material to a high temperature without fusing to drive off volatile matter

Question 4

Types of portland cement fall under

Answer 4

ASTM C-150

Question 5

Types of portland hydraulic cement

Answer 5

GU,HE,MS,HS,MH,LH
general use
high early strength
moderate sulphate resistance
high sulfate resistance
moderate heat of hydration
low heat of hydration

Question 6

PORTLAND TYPE I

Answer 6

most commonly used, moderate properties

Question 7

Portland type II

Answer 7

moderate exposure to sulphate attack, gains strength slower than type I but has same ultimate strength
reduced temp cracking so pour in warm weather

lower permeability so lowed water to cement ratio