Evaluating municipal incinerated bottom ash as a sand replacement in foamed mortar: Effects of air foam and silica fume modification
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Abstract
This study presents an investigation into the feasibility of utilizing municipal incinerated bottom ash (MIBA) as a substitute for sand in foamed flowable mortar, with a specific focus on its applicability as flowable fill materials. Employing a mix design strategy with a fixed cement content of 180 kg/m³, the research systematically varies air foam (AF) percentages (15-20% by volume), MIBA replacement levels (0-40%), and introduces silica fume (SF) at a fixed rate of 12% by weight of fine aggregate. The study assesses flowability, setting times, and compressive strength under diverse curing conditions, including normal and H2SO4 (3%) curing. H2SO4 was employed to simulate harsh curing conditions in an acidic environment, providing insights into the mortar's behavior under more aggressive circumstances. Remarkably, at 40% bottom ash and 20% air foam, flowability experiences a significant 29.3% reduction, reaching 163.4 mm. Setting times prolong with increasing MIBA percentages, showing a substantial 64.7% increase at 40% replacement. Silica fume demonstrates its positive impact, revealing approximately 16% enhanced compressive strength in mixtures with air foam under normal curing conditions. Under H2S04 curing, the mixture with 15% air foam and 12% silica fume experiences a slight reduction in compressive strength, showing a 13.7% decrease from 0.73 MPa under normal curing to 0.63 MPa. This research unveils the intricate interplay of variables, providing valuable insights for optimizing sustainable mortar formulations. Consequently, it contributes to environmentally conscious construction practices by bolstering the mechanical properties of the mortar.
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References
Al-Ejji, M., Hassan, M. K., Youssef, K., Elmakaty, F., Mehanna, H., Sliem, M., & Irshidat, M. (2023). Novel surface-treatment for bottom ash from municipal solid waste incineration to reduce the heavy metals leachability for a sustainable environment. Journal of Environmental Management, 347, 119105. https://doi.org/10.1016/j.jenvman.2023.119105
ASTM D6103. (2017). Standard test method for flow consistency of controlled low strength material. ASTM International. https://www.astm.org/d6103_d6103m-17.html
ASTM D4832. (2023). Standard test method for preparation and testing of controlled low strength material (CLSM) cylindrical test specimens. ASTM International. https://www.astm.org/d4832_d4832m-23.html
Cheng, Y., Bai, L., Du, W., Chen, L., & Yan, Y. (2023). Engineered cementitious composites using powder regenerated from municipal solid waste incineration bottom ash as supplementary cementitious material. Construction and Building Materials, 394, 132224. https://doi.org/10.1016/j.conbuildmat.2023.132224
Fan, X., Li, Z., Zhang, W., Jin, H., Chen, C., Liu, J., Xing, F., & Tang, L. (2022). Effects of different supplementary cementitious materials on the performance and environment of eco-friendly mortar prepared from waste incineration bottom ash. Construction and Building Materials, 356, 129277. https://doi.org/10.1016/j.conbuildmat.2022.129277
Fan, X., Li, Z., Zhang, W., Jin, H., Liu, J., Xing, F., & Tang, L. (2023). New applications of municipal solid waste incineration bottom ash (MSWIBA) and calcined clay in construction: Preparation and use of an eco-friendly artificial aggregate. Construction and Building Materials, 387, 131629. https://doi.org/10.1016/j.conbuildmat.2023.131629
Ho, L. S., Jhang, B. J., Hwang, C. L., & Huynh, T. P. (2022). Development and characterization of a controlled low-strength material produced using a ternary mixture of Portland cement, fly ash, and waste water treatment sludge. Journal of Cleaner Production, 356, 131899. https://doi.org/10.1016/j.jclepro.2022.131899
Huynh, T. P., Vu, V. H., & Van-Pham, D. T. (2022). Assessment of the cementitious and microstructural characteristics of an innovative waste-based eco-cement. Journal of Material Cycles and Waste Management, 24(2), 642-654. https://doi.org/10.1007/s10163-021-01349-7
Hwang, C. L., & Huynh, T. P. (2017). Characteristics of alkali-activated controlled low-strength material derived from red mud-slag blends. Key Engineering Materials, 753, 343-348. https://doi.org/10.4028/www.scientific.net/KEM.753.343
Kim, H. J., Yamada, Y., Zeng, H., & Iwanami, M. (2023). A study of chloride pretreatment methods for enhancing strength of mortar by recycling Municipal Solid Waste Incineration (MSWI) bottom ash. Case Studies in Construction Materials, 19, e02349. https://doi.org/10.1016/j.cscm.2023.e02349
Le, T. H. M., Lee, T. W., Seo, J. W., & Park, D. W. (2021). Feasibility study of locally excavated soil in foamed cement mixture as backfill material for abutments of railway bridges. Journal of Testing and Evaluation, 51(1), 21. https://doi.org/10.1520/JTE20210169
Le, T. H. M., Park, D.-W., & Seo, J.-W. (2018). Evaluation of ponded ash as a sustainable backfill material. Journal of Materials in Civil Engineering, 30(8), 04018158. https://doi.org/10.1061/(asce)mt.1943-5533.0002359
Li, Z., Zhang, W., Jin, H., Fan, X., Liu, J., Xing, F., & Tang, L. (2023). Research on the durability and Sustainability of an artificial lightweight aggregate concrete made from municipal solid waste incinerator bottom ash (MSWIBA). Construction and Building Materials, 365, 129993. https://doi.org/10.1016/j.conbuildmat.2022.129993
Lin, K. L., & Lin, D. F. (2006). Pozzolanic reactivity of the synthetic slag from municipal solid waste incinerator cyclone ash and scrubber ash. Journal of the Air and Waste Management Association, 56(5), 569-574. https://doi.org/10.1080/10473289.2006.10464476
Liu, Y., Zhao, X., Shen, Z. L., & Deng, J. (2023). Effects of pre-curing temperatures on the mechanical properties and microstructural development of impregnated municipal solid waste incineration bottom ash mortar. Construction and Building Materials, 369, 130600. https://doi.org/10.1016/j.conbuildmat.2023.130600
Lynn, C. J., Dhir OBE, R. K., & Ghataora, G. S. (2016). Municipal incinerated bottom ash characteristics and potential for use as aggregate in concrete. Construction and Building Materials, 127, 504-517. https://doi.org/10.1016/j.conbuildmat.2016.09.132
Siddique, R. (2010). Use of municipal solid waste ash in concrete. Resources, Conservation and Recycling, 55(2), 83-91. https://doi.org/10.1016/j.resconrec.2010.10.003
Zhang, S., Ghouleh, Z., He, Z., Hu, L., & Shao, Y. (2021). Use of municipal solid waste incineration bottom ash as a supplementary cementitious material in dry-cast concrete. Construction and Building Materials, 266, 120890. https://doi.org/10.1016/j.conbuildmat.2020.120890