1 Introduction
2 Experimental Program
2.1 Materials
2.1.1 Cement
Chemical composition | Mineralogical composition | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
CaO | SiO2 | Al2O3 | Fe2O3 | MgO | SO3 | I.loss QQ | Na2O | K2O | C3S | C2S | C3A | C4AF |
58.43 | 22.97 | 5.76 | 4.36 | 2.03 | 2.64 | 6.49 | 0.35 | 0.76 | 53 | 27 | 5 | 13 |
Density, D (g/cm3) | 3.1 |
Specific surface Blaine SSB (cm2/g) | 3510 |
The normal consistency NC (%) | 25 |
The initial setting time IST (min) | 155 |
The final setting time FST (min) | 212 |
2.1.2 Aggregates
Sand | Plastic waste | |
---|---|---|
The apparent density, Ad (g/cm3) | 1.45 | 0.53 |
Specific gravity, SG (g/cm3) | 2.56 | 0.87 |
Visual equivalent, VES (%) | 80 | – |
Finesse modulus, Fm | 2.5 | 4.7 |
2.2 Formulation of Mortars
Notation | Description | Cement | Water | Sand | Plastic waste |
---|---|---|---|---|---|
MR | Reference mortar | 586 | 293 | 1,758 | 0 |
MP10 | Mortar with 10 % plastic waste | 586 | 293 | 1,582 | 61 |
MP20 | Mortar with 20 % plastic waste | 586 | 293 | 1,406 | 122 |
MP30 | Mortar with 30 % plastic waste | 586 | 293 | 1,230 | 183 |
MP40 | Mortar with 40 % plastic waste | 586 | 293 | 1,055 | 244 |
3 Results and Discussion
3.1 Mechanical Strength
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The substitution of the sand by waste which is less resistant.
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Low roughness of waste which returns adherence between the grains and cement paste.
3.2 Behaviour of Mortars in the Acid Medium
3.3 Penetration of Chloride Ions
3.4 Restrained Shrinkage Test (Ring Test)
Mortars | Number of the cracks | Nature of the cracks | Photographs of the cracks | |
---|---|---|---|---|
MR | Two remarkable cracks | Visible on all the height | ||
Visible on all the height | ||||
MP10 | Only one crack | Less intense not crossing all the height | ||
MP20 | No visible crack | – | ||
MP30 | Only one crack | Less intense not crossing all the height |
3.5 Temperature Effect
4 Conclusion
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A reduction in the mechanical resistance according to the increase in percentage of PBW, which remains always close to the mortar of reference, when we recorded a fall of compressive strength at 28 days about 18 and 23 % for the mortars containing 10 and 20 % of waste respectively.
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The loss of weight for the mortars preserved in the sulfuric acid, decreases according to the increase in the percentage of waste. What indicates the good behavior of these mortars in this medium.
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The incorporation of PBW in the mortar slows down the penetration of ions chloride.
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Plastic waste improves the sensitivity to cracking of the mortar when it is subjected to the prevented withdrawal. The cracking of withdrawal appears in the form of a network of cracks shorter, not very open. In all the cases when resistance to the imposed deformations is a priority, this property is an asset for the durability of the structures.
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The mortars containing plastic waste, have a good behavior when it is subjected to the temperature effect, it preserved their initial states after thermal treatment at 125 °C.