4831621724

166

proportion of GW in brick bodies conducts also to the reduction of density. It was reported that the decrease of bulk density with the increase of heating temperaturę may be attributed to the porę volume expansion known as bloating phenomenon. This originates from the high pressures of gas such as carbon monoxide and carbon dioxide which are entrapped in closed pores (Taskiran et al., 2005). lt was reported that good quality light bricks present densities between 1.5 and 1.8 g.cm-3 (Quiijoma et al., 2012). SEM obsenations on polished sections of brieks containing 15% of GW and 30% of TCPMT revealed the presence of entrapped pores in the interior structure of these bricks. The diameter of these pores varies in the rangę 1-100 pin.

166

♦    0 % GW

10 H GW

30 c 25

O

R 20

O

JS 15 cD io

10

E ⁸

6

JL

4

2

£

o

_ 16

fll

CL

s «

I

2J 8

10

20

30

40

so

nj

5    ⁴

X

0*

5

5

10    20    30    40    50

10    20    30    40    50

TCPMT (wt.%)

50

10    20    30    40

TCPMT (wt.%)

Figurę 6.5 Physical and mechanical properties evolution with the addition of treated calamine processing minę tailings (TCFMT) and glass wastes (GW).