1 Introduction
2 Experimental Section
2.1 Aqueous Carbonation of the Slaked Lime
Reaction condition code | Agitation speed (RPM) | Temperature (°C) | CO2 injection speed (l/min) | Reaction time (min) |
---|---|---|---|---|
A | 200 | 21 | 0.3 | 20 |
B | 200 | 21 | 0.5 | 20 |
C | 450 | 21 | 0.3 | 20 |
D | 450 | 21 | 0.5 | 20 |
2.2 Hydrothermal Synthesis of the Cementitious Material
2.3 Fabrication of the ACM Based Mortar Sample
Sample code | Mix proportioning of the components | |||
---|---|---|---|---|
Cement (g) | Fine aggregate (g) | Water (ml) | Alkali activator (ml)c
| |
CCM | 100a
| 300 | 60 | – |
ACM-M1 | 100b
| 300 | 60 | – |
ACM-M2 | 100b
| 300 | 30 | 30 |
ACM-M3 | 100b
| 300 | – | 60 |
2.4 Characterizations
3 Results
3.1 pH Analysis of the Carbonation Reaction Medium
3.2 Quantification of the CO2 Consumption
Chemical constituents | No. of Exp | Moles of the reactants and products before and after the carbonization reaction in four different reaction conditions | |||||||
---|---|---|---|---|---|---|---|---|---|
Condition A | Condition B | Condition C | Condition D | ||||||
Before | After | Before | After | Before | After | Before | After | ||
Moles of Ca(OH)2
| (i) | 0.0117 | – | 0.0117 | – | 0.0117 | – | 0.0117 | – |
(ii) | 0.0117 | – | 0.0117 | – | 0.0117 | – | 0.0117 | – | |
(iii) | 0.0117 | – | 0.0117 | – | 0.0117 | – | 0.0117 | – | |
Moles of CO2
| (i) | 0.0110 | – | 0.0127 | – | 0.0096 | – | 0.0122 | – |
(ii) | 0.0103 | – | 0.0112 | – | 0.0103 | – | 0.0101 | – | |
(iii) | 0.0107 | – | 0.0115 | – | 0.0101 | – | 0.0114 | – | |
Average | 0.0107 ± 0.0004 | – | 0.0118 ± 0.0008 | – | 0.0100 ± 0.0004 | – | 0.0112 ± 0.0011 | – | |
Moles of CaCO3
| (i) | – | 0.0095 | – | 0.0118 | – | 0.0097 | – | 0.0113 |
(ii) | – | 0.0094 | – | 0.0116 | – | 0.0098 | – | 0.0109 | |
(iii) | – | 0.0098 | – | 0.0113 | – | 0.0098 | – | 0.0110 | |
Average | – | 0.0096 ± 0.0002 | – | 0.0116 ± 0.0003 | – | 0.0098 ± 0.0001 | – | 0.0111 ± 0.0002 | |
Mole % of CO2 consumptiona
| 91.2 ± 3.0 | 100.1 ± 6.8 | 85.5 ± 3.1 | 96.0 ± 9.1 |