Yong-Sing Ng, Yun-Ming Liew, Cheng-Yong Heah, Abdullah Mohd Mustafa Al Bakri, Pakawanit Phakkhananan, Vizureanu Petrica, Khalid Mohd Suhaimi, Hui-Teng Ng, Yong-Jie Hang, Nabiałek Marcin, Pietrusiewicz Paweł, Garus Sebastian, Sochacki Wojciech, Śliwa Agata
Centre of Excellence Geopolymer and Green Technology (CEGeoGTech), Universiti Malaysia Perlis (UniMAP), Kangar 01000, Malaysia.
Faculty of Chemical Engineering Technology, Universiti Malaysia Perlis (UniMAP), Kangar 01000, Malaysia.
Materials (Basel). 2022 Jun 13;15(12):4178. doi: 10.3390/ma15124178.
This paper elucidates the influence of borax decahydrate addition on the flexural and thermal properties of 10 mm thin fly ash/ladle furnace slag (FAS) geopolymers. The borax decahydrate (2, 4, 6, and 8 wt.%) was incorporated to produce FAB geopolymers. Heat treatment was applied with temperature ranges of 300 °C, 600 °C, 900 °C, 1000 °C and 1100 °C. Unexposed FAB geopolymers experienced a drop in strength due to a looser matrix with higher porosity. However, borax decahydrate inclusion significantly enhanced the flexural performance of thin geopolymers after heating. FAB2 and FAB8 geopolymers reported higher flexural strength of 26.5 MPa and 47.8 MPa, respectively, at 1000 °C as compared to FAS geopolymers (24.1 MPa at 1100 °C). The molten BO provided an adhesive medium to assemble the aluminosilicates, improving the interparticle connectivity which led to a drastic strength increment. Moreover, the borax addition reduced the glass transition temperature, forming more refractory crystalline phases at lower temperatures. This induced a significant strength increment in FAB geopolymers with a factor of 3.6 for FAB8 at 900 °C, and 4.0 factor for FAB2 at 1000 °C, respectively. Comparatively, FAS geopolymers only achieved 3.1 factor in strength increment at 1100 °C. This proved that borax decahydrate could be utilized in the high strength development of thin geopolymers.
本文阐述了添加十水硼砂对10毫米厚的粉煤灰/钢包精炼炉渣（FAS）地质聚合物的弯曲性能和热性能的影响。加入十水硼砂（2%、4%、6%和8%重量）以制备FAB地质聚合物。在300℃、600℃、900℃、1000℃和1100℃的温度范围内进行热处理。未经过热处理的FAB地质聚合物由于基体较疏松且孔隙率较高，强度有所下降。然而，加入十水硼砂显著提高了热处理后薄地质聚合物的弯曲性能。与FAS地质聚合物（在1100℃时为24.1MPa）相比，FAB2和FAB8地质聚合物在1000℃时分别具有更高的弯曲强度，分别为26.5MPa和47.8MPa。熔融的BO提供了一种粘结介质来组装铝硅酸盐，改善了颗粒间的连通性，从而导致强度大幅增加。此外，硼砂的加入降低了玻璃化转变温度，在较低温度下形成了更多难熔的晶相。这使得FAB地质聚合物的强度显著增加，FAB8在900℃时强度增加系数为3.6，FAB2在1000℃时强度增加系数为4.0。相比之下，FAS地质聚合物在1100℃时强度增加系数仅为3.1。这证明十水硼砂可用于薄地质聚合物的高强度开发。
