Mechanical and Durability Properties of Green Star Concretes
2. Materials and Methods
3. Results and Discussion
- Green star concretes exhibited reduction in compressive strength, indirect tensile strength and elastic modulus at both 7 and 28 days compared to control concrete. However, the reduction at 7 days of green star concrete is much higher than at 28 days. Formation of additional hydration products and particle packing due to pozzolianic reaction and small particle size of slag are contributed to the increase in above mechanical properties at 28 days. Three green star concrete exhibited about 18%, 10% and 12% reduction in compressive strength, indirect tensile strength and elastic modulus, respectively at 28 days compared to control concrete while containing 40% less OPC, 40% less NCA and 50% less fresh water.
- The two green star concrete containing 40% slag exhibited lower water absorption, sorptivity and chloride permeability than control concrete at both ages, while three green star concrete containing 40% slag, 40% RCA and 50% concrete wash water exhibited better durability properties at both ages except the water absorption which is about 25% higher than two green star concrete at 28 days. The presence of 40% RCA, whose water absorption capacity is much higher than the NCA, is the reason for such increase in water absorption.
- Both two and three green star concretes exhibited 28 days compressive strength of about 40 MPa and much lower chloride permeability than control concrete. Therefore, these green concretes can be used in structural application with good resistance against reinforcement corrosion.
Conflicts of Interest
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|Series||Mix Proportions in Kg/m3|
|OPC||Slag||Fine Aggregate||Natural Coarse Aggregate||Recycled Coarse Aggregate||Tap Water||Wash Water|
|Mix 1 (Control)||413||-||512||1254||-||190||-|
|Mix 2 (2 Green star)||248||165||512||1254||-||190||-|
|Mix 4 (3 Green star)||248||165||512||752||502||95||95|
|Chemical Analysis||OPC (wt %)||Slag (wt %)|
|Un-compacted bulk density (kg/m3)||1547||1301||1498|
|Water absorption (%)||1.6||7.1||1.16|
|Chemical Properties||Tap Water||Wash Water|
|Chloride content (mg/L)||60||61|
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Shaikh, F. Mechanical and Durability Properties of Green Star Concretes. Buildings 2018, 8, 111. https://doi.org/10.3390/buildings8080111
Shaikh F. Mechanical and Durability Properties of Green Star Concretes. Buildings. 2018; 8(8):111. https://doi.org/10.3390/buildings8080111Chicago/Turabian Style
Shaikh, Faiz. 2018. "Mechanical and Durability Properties of Green Star Concretes" Buildings 8, no. 8: 111. https://doi.org/10.3390/buildings8080111