portland cement clinker microstructure c 3 s, c 2 s, c 3 a, c 4 af 200 micron
TRANSCRIPT
Course admin•18 h lectures •Course text:
CALLISTERMATERIALS SCIENCE AND ENGINEERING5TH EDN, WILEY, 2000Selected chapters: 1-16, 18, 20
•Tutorials from Week 5•Tutorial problems from Week 4•Supplementary material on web
•Feedback etc: [email protected] [email protected]
SummaryTo provide a broad introduction to the materials used in engineering, their properties and structures
Module objectives On completing the module, students should
Be familiar with the major classes of engineering materialsthe mechanical, thermal and chemical properties of engineering materials,
their definition, measurement and specification Be able to locate material property dataUnderstand in qualitative terms the physical basis of material structure
of the principal engineering properties of materialsBe familiar with
elementary concepts of ferrous metallurgythe concepts of electrochemical corrosionthe major polymeric materials and their use as solid polymers, coatings,
foams and adhesivesthe main types of ceramics, cements and glasses used in engineeringthe main materials processing operations
Thermal properties cluster
•Thermal expansivity •Thermal conductivity •Specific heat capacity c•Melting temperature Tm
•… others??
CALLISTER Ch 20 [5th edn]
Quiz 10 Jan 08
•What is the melting temperature of iron? 1540 °C •What is the density of iron? 7 900 kg/m3
Quiz 10 Jan 08
•What is the melting temperature of iron? 1540 °C•What is the density of iron? 7 900 kg/m3
•What is the density of gold?
Quiz 10 Jan 08
•What is the melting temperature of iron? 1540 °C•What is the density of iron? 7 900 kg/m3
•What is the density of gold? 19 300 kg/m3
Quiz 10 Jan 08
•What is the melting temperature of iron? 1540 °C•What is the density of iron? 7 900 kg/m3
•What is the density of gold? 19 300 kg/m3
•What is the density of air?
Quiz 10 Jan 08
•What is the melting temperature of iron? 1540 °C•What is the density of iron? 7 900 kg/m3
•What is the density of gold? 19 300 kg/m3
•What is the density of air? 1.2 kg/m3
Quiz 10 Jan 08
•What is the melting temperature of iron? 1540 °C•What is the thermal expansivity of brass? 20 10-6 K-1
•What is the density of iron? 7 900 kg/m3
•What is the density of gold? 19 300 kg/m3
•What is the density of air? 1.2 kg/m3
•What is the Young’s modulus of steel?
Quiz 10 Jan 08
•What is the melting temperature of iron? 1540 °C•What is the thermal expansivity of brass? 20 10-6 K-1
•What is the density of iron? 7 900 kg/m3
•What is the density of gold? 19 300 kg/m3
•What is the Young’s modulus of steel? 200 GPa
Quiz 10 Jan 08
•What is the melting temperature of iron? 1540 °C
•What is the density of iron? 7 900 kg/m3
•What is the density of gold? 19 300 kg/m3
•What is the density of air? 1.2 kg/m3
•What is the Young’s modulus of steel? 200 GPa•What is the thermal expansivity of brass?
Quiz 10 Jan 08
•What is the melting temperature of iron? 1540 °C
•What is the density of iron? 7 900 kg/m3
•What is the density of gold? 19 300 kg/m3
•What is the density of air? 1.2 kg/m3
•What is the Young’s modulus of steel? 200 GPa•What is the thermal expansivity of brass? 20 10-6 K-1
Explosive spalling in concreteunder fire conditions
Quartz...
•Major constituent of granite, quartzite and other mineral aggregates used in concrete
•Alpha-beta quartz transition•Displacive structural transition•573 °C•2 % INCREASE in volume
See Tucker, Keen and Dove, Min Mag 2001, 65, 489-507
Quiz 6 Feb 04
•What is the effect of porosity on
•thermal expansivity?•density?•thermal conductivity?•elastic modulus?•strength?
Quiz 6 Feb 04
•What is the effect of porosity on
•thermal expansivity?•density?•thermal conductivity?•elastic modulus?•strength?
As Ap
Density
Define volume fraction porosity f
f = Volume voids/Total volume
Bulk density
b = s(1 - f )
where s is solid density
Density
Density relation is a simple example of the Law of Mixtures for material properties
Composite material A, Bwith volume fractions fA, fB
Xcom = fAXA + fBXB
Quiz 6 Feb 04
•What is the effect of porosity on thermal expansivity?
•How does vary with f ?
is independent of f
As Ap
Thermal conductivity
•Defining equation q = dTdx
where q is the heat flux
•Units w (m K)
•Typical values and range
1000 --- 0.01 w (mK)
See for example Ashby charts