Tahir Muhammad Faheem Mohd, Abdullah Mohd Mustafa Al Bakri, Rahim Shayfull Zamree Abd, Mohd Hasan Mohd Rosli, Sandu Andrei Victor, Vizureanu Petrica, Ghazali Che Mohd Ruzaidi, Kadir Aeslina Abdul
Centre of Excellence Geopolymer and Green Technology, (CEGeoGTech), Universiti Malaysia Perlis, Perlis 01000, Malaysia.
Faculty of Chemical Engineering Technology, Universiti Malaysia Perlis, Perlis 01000, Malaysia.
Materials (Basel). 2022 May 11;15(10):3458. doi: 10.3390/ma15103458.
Ordinary Portland cement (OPC) is a conventional material used to construct rigid pavement that emits large amounts of carbon dioxide (CO) during its manufacturing process, which is bad for the environment. It is also claimed that OPC is susceptible to acid attack, which increases the maintenance cost of rigid pavement. Therefore, a fly ash based geopolymer is proposed as a material for rigid pavement application as it releases lesser amounts of CO during the synthesis process and has higher acid resistance compared to OPC. This current study optimizes the formulation to produce fly ash based geopolymer with the highest compressive strength. In addition, the durability of fly ash based geopolymer concrete and OPC concrete in an acidic environment is also determined and compared. The results show that the optimum value of sodium hydroxide concentration, the ratio of sodium silicate to sodium hydroxide, and the ratio of solid-to-liquid for fly ash based geopolymer are 10 M, 2.0, and 2.5, respectively, with a maximum compressive strength of 47 MPa. The results also highlight that the durability of fly ash based geopolymer is higher than that of OPC concrete, indicating that fly ash based geopolymer is a better material for rigid pavement applications, with a percentage of compressive strength loss of 7.38% to 21.94% for OPC concrete. This current study contributes to the field of knowledge by providing a reference for future development of fly ash based geopolymer for rigid pavement applications.
普通硅酸盐水泥（OPC）是一种用于建造刚性路面的传统材料，在其制造过程中会排放大量二氧化碳（CO），这对环境不利。还有人声称，OPC易受酸侵蚀，这增加了刚性路面的维护成本。因此，提出了一种基于粉煤灰的地质聚合物作为刚性路面应用的材料，因为它在合成过程中释放的CO量较少，并且与OPC相比具有更高的耐酸性。本研究优化了配方，以生产具有最高抗压强度的基于粉煤灰的地质聚合物。此外，还测定并比较了基于粉煤灰的地质聚合物混凝土和OPC混凝土在酸性环境中的耐久性。结果表明，基于粉煤灰的地质聚合物的氢氧化钠浓度、硅酸钠与氢氧化钠的比例以及固液比的最佳值分别为10 M、2.0和2.5，最大抗压强度为47 MPa。结果还突出表明，基于粉煤灰的地质聚合物的耐久性高于OPC混凝土，这表明基于粉煤灰的地质聚合物是刚性路面应用的更好材料，OPC混凝土的抗压强度损失百分比为7.38%至21.94%。本研究通过为基于粉煤灰的地质聚合物在刚性路面应用中的未来发展提供参考，为知识领域做出了贡献。
