Waterproofing Admixture and Aloe Vera Biopolymer Gel in Concrete: Microstructure, Durability and Structural Validation
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Concrete durability in aggressive environments is often limited by chloride ingress, carbonation, and sulfate attack, which compromise structural integrity and increase maintenance costs. This study examines the combined effects of an integral waterproofing admixture (Sika®-1, 3– 4% cement weight) and Aloe vera biopolymer (1–2% cement weight) on mechanical performance, durability, and microstructural characteristics of conventional concrete. Four mixtures were produced: a control (P1) and three hybrid formulations (P2: 4%S1+1%AV; P3: 3.5%S1+1.5%AV; P4: 3%S1+2%AV), subjected to fresh state testing, strength development at 7, 14, and 28 days, and durability assessment including water permeability, chloride penetration, sulfate resistance, carbonation depth, ultrasonic pulse velocity, and surface abrasion through 56 days, alongside X-ray diffraction, Fourier-transform infrared spectroscopy, and scanning electron microscopy analysis. The optimal mixture (P4) achieved 28.77 MPa compressive strength, reduced water permeability to 0.00420 cm/s, lowered chloride penetration to 138.38 Coulombs, and minimized carbonation depth to 0.44 mm, with microstructural analysis revealing enhanced C-S-H gel densification and refined porosity. Pilot-scale reinforced concrete frames fabricated with P4 exhibited 9.6% lower maximum strain, confirming improved structural stiffness and durability. Techno-economic evaluation yielded an index of 1.104, demonstrating economic viability despite an 11.2% material cost increase. These results support the use of the hybrid admixture system as a sustainable option for extending concrete service life in marine, industrial, and tropical environments.
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[1] Shalchian, M. M., Arabani, M., Farshi, M., Ranjbar, P. Z., Khajeh, A., & Payan, M. (2025). Sustainable construction materials: Application of chitosan biopolymer, rice husk biochar, and hemp fibers in geo-structures. Case Studies in Construction Materials, 22(January), 4528. doi:10.1016/j.cscm.2025.e04528.
[2] Caldas, L. R., de Araujo, A. F., Hasparyk, N. P., Tiecher, F., Amantino, G., & Filho, R. D. T. (2022). Circular economy in concrete production: Greenhouse Gas (GHG) emissions assessment of rice husk bio-concretes. Revista IBRACON de Estruturas e Materiais, 15(6), e15602. doi:10.1590/S1983-41952022000600002.
[3] Chen, L., Huang, L., Hua, J., Chen, Z., Wei, L., Osman, A. I., Fawzy, S., Rooney, D. W., Dong, L., & Yap, P. S. (2023). Green construction for low-carbon cities: a review. Environmental Chemistry Letters, 21(3), 1627–1657. doi:10.1007/s10311-022-01544-4.
[4] Suclupe, R., Cubas, M., Correa, Y., & Maza, J. (2024). Influence of Rice Husk Ash as a Partial Substitute for Cement on the Microstructure and Mechanical Properties of Concrete. Civil Engineering and Architecture, 12(5), 3697–3715. doi:10.13189/cea.2024.120540.
[5] Melendrez Llontop, M. S., Fernández Salazar, V. A., Cubas Armas, M. R., & Suclupe Sandoval, R. E. (2025). Sustainable structural concrete optimization with locust bean pod ash and silica fume: impact on mechanical properties. Innovative Infrastructure Solutions, 10(6), 14. doi:10.1007/s41062-025-02043-5.
[6] Cubas, M., Correa, E., Benavides, W., Suclupe, R., & Arriola, G. (2025). Modified Asphalt Mixtures Incorporating Pulverized Recycled Rubber and Recycled Asphalt Pavement. Civil Engineering Journal (Iran), 11(2), 420–436. doi:10.28991/CEJ-2025-011-02-02.
[7] Stivaros, P. C. (2025). Service life evaluation in concrete rehabilitation – a sustainability benefit. Revista Alconpat, 15(2), 205–217. doi:10.21041/ra.v15i2.814.
[8] Miah, M. J., Miah, M. S., Mughal, H., & Hasan, N. M. S. (2025). Mitigating Environmental Impact Through the Use of Rice Husk Ash in Sustainable Concrete: Experimental Study, Numerical Modelling, and Optimisation. Materials, 18(14), 3298. doi:10.3390/ma18143298.
[9] Kalokhe, P. V., & Kshirsagar, M. P. (2025). Impact of Biopolymers on the Mechanical and Durability Properties of Concrete: A Comprehensive Review. Revue Des Composites et Des Materiaux Avances, 35(5), 909–923. doi:10.18280/rcma.350511.
[10] Ahmed, S., & Memon, F. A. (2022). Experimental study on aloe vera gel as a water reducing admixture in concrete. International Research Journal of Modernization in Engineering Technology and Science, 4(5), 2796-2800.
[11] Vignesh, J., Ramesh, B., & Xavier, J. R. (2025). A review of recent trends in sustainable biopolymer-integrated concrete and its impact on mechanical performance and structural reliability. International Journal of Biological Macromolecules, 321, 146408. doi:10.1016/j.ijbiomac.2025.146408.
[12] Barco-Tocto, E. K., Agüero-Hualcas, D. S., & Farfán-Córdova, M. (2025). Nopal extract and aloe vera to improve structural concrete exposed to saline environments. Revista Facultad de Ingeniería Universidad de Antioquia, (115), 62-74. doi:10.17533/udea.redin.20240514.
[13] Oshim, U. E., Onwuka, D. O., Njoku, F. C., Onwuka, U. S., & Anyaogu, L. (2025). Prediction of flexural strength of concrete containing aloe vera gel as admixture using Ibearugbulem’s regression method. UNIZIK Journal of Engineering and Applied Sciences, 4(1), 1504-1516.
[14] Aher, P. D., Patil, Y. D., Waysal, S. M., & Bhoi, A. M. (2023). Critical review on biopolymer composites used in concrete. Materials Today: Proceedings. doi:10.1016/j.matpr.2023.07.212.
[15] Suwondo, R., Suangga, M., Dario, A., & Cunningham, L. (2024). Enhancing Concrete Durability Through Crystalline Waterproofing Admixtures: a Comprehensive Performance Evaluation. International Journal of GEOMATE, 26(114), 17–24. doi:10.21660/2024.114.4074.
[16] Wang, C., Xiao, J., Long, C., Zhang, Q., Shi, J., & Zhang, Z. (2023). Influences of the joint action of sulfate erosion and cementitious capillary crystalline waterproofing materials on the hydration products and properties of cement-based materials: A review. Journal of Building Engineering, 68, 106061. doi:10.1016/j.jobe.2023.106061.
[17] Fang, Y., Wang, Z., Yan, D., Lai, H., Ma, X., Lai, J., Liu, Y., Zhong, L., Chen, Z., Zhang, X., Lin, Z., & Wang, D. (2024). Study on rheological, adsorption and hydration properties of cement slurries incorporated with EPEG-based polycarboxylate superplasticizers. Frontiers in Materials, 11, 1358630. doi:10.3389/fmats.2024.1358630.
[18] Moeinian, M., Ardjmand, M., & Nosratinia, F. (2024). Evaluating the operational properties of concrete admixtures containing molecularly modified polycarboxylate superplasticizers. Scientific Reports, 14(1), 20170. doi:10.1038/s41598-024-71078-y.
[19] Li, W., Wei, Q., Chen, Q., & Jiang, Z. (2022). Effect of CO32- and Ca2+ on self-healing of cementitious materials due to “build-in” carbonation. Journal of Building Engineering, 56, 104781. doi:10.1016/j.jobe.2022.104781.
[20] Gojević, A., Ducman, V., Grubeša, I. N., Baričević, A., & Pečur, I. B. (2021). The effect of crystalline waterproofing admixtures on the self-healing and permeability of concrete. Materials, 14(8), 1860. doi:10.3390/ma14081860.
[21] Zhao, Y., Yang, B., Zhang, K., Guo, A., Yu, Y., & Chen, L. (2025). Machine Learning Models for Predicting Freeze–Thaw Damage of Concrete Under Subzero Temperature Curing Conditions. Materials, 18(12), 2856. doi:10.3390/ma18122856.
[22] Qin, Q., Ma, H., Liang, L., Liu, Y., Lv, Z., Wang, J., & Jin, P. (2024). Effect of heat-treatment on corrosion behavior of Mg-4Gd-2Nd alloy. Journal of Materials Research and Technology, 29, 3156-3167. doi:10.1016/j.jmrt.2024.02.045.
[23] Ševčík, R., Kolář, M., Pokorný, J., Zárybnická, L., Honzíček, J., & Machotová, J. (2025). Polymeric bio-based nanodispersed admixtures for the production of hydrophobic Portland cement mortars. Frontiers in Built Environment, 11, 1701378. doi:10.3389/fbuil.2025.1701378.
[24] Oshim, U. E., Onwuka, D. O., Njoku, F. C., & Onwuka, U. S. (2024). Application of Regression Model in Predicting Compressive Strength of Concrete Incorporating Aloe Vera Gel as Admixture. Journal of Materials Engineering, Structures and Computation, 3(4), 39–53. doi:10.5281/zenodo.14576774.
[25] Liu, C., Cui, Y., Pi, F., Cheng, Y., Guo, Y., & Qian, H. (2019). Extraction, purification, structural characteristics, biological activities and pharmacological applications of acemannan, a polysaccharide from aloe vera: A review. Molecules, 24(8), 1554. doi:10.3390/molecules24081554.
[26] SIKA WT-240P. (2019). Crystalline Waterproofing Admixture. SIKA USA, New Jersey, United States. Available online: https://usa.sika.com/en/construction/concrete/contact-us/crystalline-waterproofing-admixture.html (accessed on April 2026).
[27] Wang, Y., Wang, W., & Wang, L. (2022). Understanding the relationships between rheology and chemistry of asphalt binders: A review. Construction and Building Materials, 329. doi:10.1016/j.conbuildmat.2022.127161.
[28] Palacios, M., Flatt, R. J., Puertas, F., & Sanchez-Herencia, A. (2012). Compatibility between polycarboxylate and viscosity-modifying admixtures in cement pastes. American Concrete Institute, ACI Special Publication, 288 SP, 29–42. doi:10.14359/51684218.
[29] Liu, B., Wang, S., Jia, W., Ying, H., Lu, Z., & Hong, Z. (2024). The Effect of RHA as a Supplementary Cementitious Material on the Performance of PCM Aggregate Concrete. Buildings, 14(7), 2150. doi:10.3390/buildings14072150.
[30] Andrade Neto, J. da S., de França, M. J. S., Amorim Júnior, N. S. de, & Ribeiro, D. V. (2021). Effects of adding sugarcane bagasse ash on the properties and durability of concrete. Construction and Building Materials, 266, 120959. doi:10.1016/j.conbuildmat.2020.120959.
[31] Antolín-Rodríguez, A., Merino-Maldonado, D., Fernández-Raga, M., González-Domínguez, J. M., Morán-del Pozo, J. M., Pozo, M. del, García-González, J., & Juan-Valdés, A. (2024). Microstructural, durability and colorimetric properties of concrete coated with a controlled application of graphene oxide. Journal of Building Engineering, 86(December), 108920. doi:10.1016/j.jobe.2024.108920.
[32] Pang, J., Guo, J., Li, W., & Chang, Q. (2023). Effect of chain transfer agents in polycarboxylate superplasticizer on slump-retention of concrete. Canadian Journal of Chemical Engineering, 101(12), 6919–6927. doi:10.1002/cjce.25017.
[33] Hu, M., Ji, S., Sun, Y., & Zhu, K. (2025). Understanding the low-temperature fracture behavior of rejuvenated high viscosity modified asphalt utilizing a combined microstructure-component analysis. Construction and Building Materials, 471(2), 140717. doi:10.1016/j.conbuildmat.2025.140717.
[34] Minjares-Fuentes, R., Femenia, A., Comas-Serra, F., & Rodríguez-González, V. M. (2018). Compositional and structural features of the main bioactive polysaccharides present in the aloe vera plant. Journal of AOAC International, 101(6), 1711–1719. doi:10.5740/jaoacint.18-0119.
[35] Yu, Z., Wang, Y., & Li, J. (2022). Performance Investigation and Cost–Benefit Analysis of Recycled Tire Polymer Fiber-Reinforced Cemented Paste Backfill. Polymers, 14(4), 708. doi:10.3390/polym14040708.
[36] dos Santos Lima, G. T., Oliveira, M. V. C., de Andrade Pinto, R. C., & Rocha, J. C. (2023). Is the diffuse ultrasound method reliable for evaluating autonomous self-healing in cementitious materials with expansive agent pellets?. Materials Letters, 351, 135058. doi:10.1016/j.matlet.2023.135058.
[37] Aranda Cuevas, B., Herrera Méndez, C. H., Flores, I. I., Solís-Pereira, S., Cuevas-Glory, L., Muñoz, G. R., Vargas y Vargas, M. de L., & Cortez, J. T. (2016). Main Polysaccharides Isolated and Quantified of Aloe vera Gel in Different Seasons of the Year. Food and Nutrition Sciences, 07(06), 447–453. doi:10.4236/fns.2016.76046.
[38] Aburto-Moreno, Z., Alvarado-Quintana, H., & Vásquez-Alfaro, I. (2018). Influence of the percentage of aloe-vera on compressive strength, infiltration, capillary absorption, time of setting and settlement in a structural concrete. Sciéndo, 21(2), 105–118. doi:10.17268/sciendo.2018.011.
[39] Yehia, S., Ibrahim, A. M., & Ahmed, D. F. (2023). The impact of using natural waste biopolymer cement on the properties of traditional/fibrous concrete. Innovative Infrastructure Solutions, 8(11), 287. doi:10.1007/s41062-023-01253-z.
[40] Zhang, Z., Zhang, D., Zhou, J., Zhang, D., & Tan, K. H. (2025). A critical review on high temperature performance of sustainable cementitious materials. Npj Materials Sustainability, 3(1). doi:10.1038/s44296-025-00081-9.
[41] Polat, R., Demirboğa, R., Karakoç, M. B., & Türkmen, İ. (2010). The influence of lightweight aggregate on the physico-mechanical properties of concrete exposed to freeze–thaw cycles. Cold Regions Science and Technology, 60(1), 51-56. doi:10.1016/j.coldregions.2009.08.010.
[42] Abdellatief, M., Hassan, Y. M., Elnabwy, M. T., Wong, L. S., Chin, R. J., & Mo, K. H. (2024). Investigation of machine learning models in predicting compressive strength for ultra-high-performance geopolymer concrete: A comparative study. Construction and Building Materials, 436, 136884. doi:10.1016/j.conbuildmat.2024.136884.
[43] Mousavinezhad, S., Toledo, W. K., Newtson, C. M., & Aguayo, F. (2024). Rapid Assessment of Sulfate Resistance in Mortar and Concrete. Materials, 17(19), 4678. doi:10.3390/ma17194678.
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