Using Natural Pozzolans to Partially Replace Cement in Pervious Concretes: A Sustainable Alternative?
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.1.1. Water
2.1.2. Cement
2.1.3. Water–Cement Ratio
2.1.4. Fine Aggregate
2.1.5. Coarse Aggregate
2.1.6. Zeolite
2.1.7. Pumicite
2.1.8. Additive
2.2. Variables to Characterize Pervious Concrete
2.2.1. Compressive Strength
2.2.2. Flexural Strength
2.2.3. Permeability
2.2.4. Porosity
2.2.5. Microanalysis
2.3. Experimental Series
2.4. Experimentation
2.4.1. Pervious Concrete Mix Dosage
2.4.2. Preparation, Compaction, and Curing
3. Results
3.1. Best Reference Sample
3.2. Effects of Pumicite and Zeolite on Pervious Concrete Properties
3.3. SEM Microscopy Analysis
- Calcium silicate hydrate (or C-S-H gel): the main product of the hydration of Portland cement.
- Calcium hydroxide: C-H crystals are large prismatic crystals of calcium hydroxide and C-H surfaces.
- Ettringite: a result of the reaction of calcium aluminate (C3A) with calcium sulfate.
3.4. Effects of Additive on Pervious Concrete Properties
4. Discussion
5. Conclusions
- Considering the incorporation of zeolite as a replacement for cement, it was found that, at any percentage of replacement, the compressive strength and flexural strength decrease. On the other hand, as the percentage of replacement increases, both the permeability and the porosity of the samples increase.
- Considering the incorporation of pumicite as a replacement for cement, the most important findings are those related to compressive and flexural strength. It was observed that with a 10% cement replacement with pumicite, greater compressive and flexural strength were obtained compared to the reference sample, while permeability decreases but not significantly. At 20%, the strengths decrease but are still comparable to the reference sample since they are within the standard deviation range, and the permeability is similar to the reference sample at this percentage.
- The incorporation of a plasticizer additive as a water reducer enables the improvement of the compressive and flexural strength, in all cases, without significantly affecting the permeability or porosity of the samples. However, it is necessary to consider that in the case of pervious concretes, the type of additive to be used and its dosage must be previously investigated in a laboratory to avoid the sedimentation of the cement paste mixture and prevent the generation of an impermeable layer at the bottom of the molds of the samples.
- The difference between the strengths obtained by replacing cement with zeolite or pumicite is explained by interpreting SEM images, which indicate that there are several differences with respect to the reference sample. The samples with zeolite present fewer C-H hexagonal crystals, the C-H surfaces are smaller, there is a greater presence of ettringite, and the C-S-H matrix is less dense than the reference sample. The samples with pumicite, on the other hand, show a dense microporous matrix similar to the reference sample, the C-S-H matrix is denser than the reference sample, and a large number of C-H hexagonal crystals are present.
- The promising results obtained in flexural strength and permeability by replacing the cement with 10% pumicite and incorporating an additive make this technique ideal for use in permeable pavements since a fundamental requirement for its design is flexural strength.
- Finally, being able to replace either 10% or 20% of the cement with locally obtained pozzolanic minerals, from a sustainable point of view, contributes to a reduction in the size of the carbon footprint of the cement industry and promotes the use of supplementary cementitious materials in countries where their use has not yet become widespread.
- The work presented in this article attempted to contribute to a reduction in the use of cement in permeable pavement structures, seeking alternatives to traditional pavements that have less environmental impact, such as natural pozzolans (zeolite and pumicite).
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Properties | Cement | Requirements NCh 148 | |
---|---|---|---|
Specific gravity (g/cm3) | 2.8 | - | |
Autoclave expansion (%) | 0.1 | <1.0 | |
Initial setting (h:m) | 02:40 | >1.00 | |
Final setting (h:m) | 03:40 | <12:00 | |
Compressive strength (kg/cm2) | 7 days | 320 | >180 |
28 days | 410 | >250 |
Physical Properties | Fine Aggregate | Coarse Aggregate |
---|---|---|
Relative Density (kg/m3) | 2682 | 2643 |
Relative Density SSD (kg/m3) | 2729 | 2683 |
Apparent Relative Density (kg/m3) | 2814 | 2752 |
Compacted Bulk Density (kg/m3) | 1635 | 1500 |
Water Absorption (%) | 1.75 | 1.49 |
Materials finer than #200 sieve (%) | 0.59 | 0.05 |
Fineness Modulus | 2.53 | 8.89 |
Series | Experiment | W/C | FA/CA | Z | P | A 1 | P1 | P2 | P3 | P4 |
---|---|---|---|---|---|---|---|---|---|---|
1 | 1 | 0.39 | 15% | 0 | 0 | 0 | 7-14-28 | 7-28 | 28 | 28 |
2 | 0.35 | 20% | 0 | 0 | 0 | 7-14-28 | 7-28 | 28 | 28 | |
2 | 1 | 0.35 | 20% | 10% | 0 | 0 | 7-14-28 | 28 | 28 | 28 |
2 | 0.35 | 20% | 20% | 0 | 0 | 7-14-28 | 28 | 28 | 28 | |
3 | 0.35 | 20% | 0 | 10% | 0 | 7-14-28 | 28 | 28 | 28 | |
4 | 0.35 | 20% | 0 | 20% | 0 | 7-14-28 | 28 | 28 | 28 | |
3 | 1 | 0.35 | 20% | 0 | 0 | 0.7% | 7-14-28 | 7-28 | 28 | 28 |
2 | 0.35 | 20% | 0 | 10% | 0.7% | 7-14-28 | 7-28 | 28 | 28 |
Series | Exp. | Mixture ID | Gravel | Sand | Cement | Water | Zeolite | Pumicite | Additive 1 |
---|---|---|---|---|---|---|---|---|---|
1 | 1 | PC-0.39-15 | 1345.7 | 201.9 | 345.3 | 134.7 | - | - | - |
2 | PC-0.35-20 | 1325.5 | 265.2 | 341.8 | 119.6 | - | - | - | |
2 | 1 | PC-Z-10 | 1325.5 | 265.2 | 310.7 | 119.6 | 31.1 | - | - |
2 | PC-Z-20 | 1325.5 | 265.2 | 284.8 | 119.6 | 57.0 | - | - | |
3 | PC-P-10 | 1325.5 | 265.2 | 310.7 | 119.6 | - | 31.1 | - | |
4 | PC-P-20 | 1325.5 | 265.2 | 284.8 | 119.6 | - | 57.0 | - | |
3 | 1 | PC-0.35-20-PL | 1325.5 | 265.2 | 341.8 | 101.7 | - | - | 0.7 |
2 | PC-P-10-PL | 1325.5 | 265.2 | 310.7 | 101.7 | - | 31.1 | 0.7 |
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Oviedo, I.; Pradena, M.; Link, Ó.; Balbo, J.T. Using Natural Pozzolans to Partially Replace Cement in Pervious Concretes: A Sustainable Alternative? Sustainability 2022, 14, 14122. https://doi.org/10.3390/su142114122
Oviedo I, Pradena M, Link Ó, Balbo JT. Using Natural Pozzolans to Partially Replace Cement in Pervious Concretes: A Sustainable Alternative? Sustainability. 2022; 14(21):14122. https://doi.org/10.3390/su142114122
Chicago/Turabian StyleOviedo, Ignacio, Mauricio Pradena, Óscar Link, and José T. Balbo. 2022. "Using Natural Pozzolans to Partially Replace Cement in Pervious Concretes: A Sustainable Alternative?" Sustainability 14, no. 21: 14122. https://doi.org/10.3390/su142114122