Kim Wonchang, Kim Taehyung, Lee Taegyu
Department of Fire and Disaster Prevention, Semyung University, Jecheon-si 27136, Choongbuk, Republic of Korea.
Materials (Basel). 2024 Dec 9;17(23):6016. doi: 10.3390/ma17236016.
Bio-sulfur (BS), extracted from landfill bio-gas via microbial methods, was examined herein as a potential cement replacement material. The study developed five modified BS variants through limestone incorporation processes (sulfur-to-limestone ratios of 1:0.5, 1:1, 1:1.5, 1:3, and 1:5). The study revealed that modified BS with higher limestone ratios demonstrates significant workability and strength reductions of over 50% with increased content, leading to the adoption of a sulfur-to-limestone ratio of 1:1. The concrete specimens exhibited compressive strength improvements of up to 12% with increased BS content, while the UPV showed proportional increases with increased BS content that remained independent of the water/binder (W/B) ratio. Statistical analysis confirmed significance with -values below 0.05. XRD analysis identified initial cement hydrate peaks at 3 d that evolved into distinct Mg-S hydrate and Ca-Al-S hydrate formations in the BS-containing specimens by 28 d.
通过微生物方法从垃圾填埋场沼气中提取的生物硫（BS），在本文中作为一种潜在的水泥替代材料进行了研究。该研究通过掺入石灰石的过程（硫与石灰石的比例为1:0.5、1:1、1:1.5、1:3和1:5）开发了五种改性生物硫变体。研究表明，石灰石比例较高的改性生物硫随着含量增加，工作性和强度显著降低超过50%，因此采用了1:1的硫与石灰石比例。随着生物硫含量增加，混凝土试件的抗压强度提高了12%，而超声波脉冲速度（UPV）随着生物硫含量增加呈比例增加，且与水胶比（W/B）无关。统计分析确认了显著性，p值低于0.05。X射线衍射（XRD）分析确定了3天时的初始水泥水化物峰，到28天时，含生物硫的试件中演变成明显的镁-硫水化物和钙-铝-硫水化物形成。
