Peng Yanzhou, Li Haitian, Yin Hefei, Xiao Ji, Xu Gang
Hubei Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Yichang 443002, China.
College of Civil Engineering and Architecture, China Three Gorges University, Yichang 443002, China.
Materials (Basel). 2025 Jul 10;18(14):3266. doi: 10.3390/ma18143266.
This study focuses on developing a novel clinker-free cement, specifically comprising phosphorus slag-based cementitious materials (PSCMs), by utilizing lime and industrial byproducts, including granulated electric furnace phosphorus slag and fluidized bed combustion bottom ash. The optimal composition of PSCM was determined by investigating the effects of different proportions of activators (water glass and sodium sulfate) and retarder (potassium fluoride) on the setting time and the mechanical strength of PSCMs. Performance evaluations demonstrated that the compressive and flexural strengths of the optimal PSCM formulation at 28 days were 64.1 MPa and 7.5 MPa, respectively. Notably, concrete prepared with the optimal PSCM exhibited superior freeze-thaw resistance and sulfate resistance compared to Portland cement concrete of equivalent strength grades. The comprehensive characterization of selected PSCM compositions, conducted using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and scanning electron microscope-energy-dispersive spectrometry (SEM-EDS), provided in-depth insights into the interrelationship among mechanical properties, durability, and microstructural characteristics. SEM-EDS analysis confirmed that calcium aluminosilicate hydrate and sodium aluminosilicate hydrate are the predominant hydration products of PSCMs. FTIR and TG analyses elucidated the continuous hydration behavior of PSCMs during the curing process, while SEM observations revealed a densely compact microstructure in the hardened PSCM paste.
本研究聚焦于开发一种新型无熟料水泥，具体由磷渣基胶凝材料（PSCMs）组成，通过利用石灰和工业副产品，包括粒化电炉磷渣和流化床燃烧底灰来实现。通过研究不同比例的活化剂（水玻璃和硫酸钠）和缓凝剂（氟化钾）对PSCMs凝结时间和力学强度的影响，确定了PSCM的最佳组成。性能评估表明，最佳PSCM配方在28天时的抗压强度和抗折强度分别为64.1MPa和7.5MPa。值得注意的是，与同等强度等级的波特兰水泥混凝土相比，用最佳PSCM制备的混凝土表现出优异的抗冻融性和抗硫酸盐性。使用X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、热重分析（TGA）和扫描电子显微镜-能谱分析（SEM-EDS）对选定的PSCM组成进行的综合表征，深入洞察了力学性能、耐久性和微观结构特征之间的相互关系。SEM-EDS分析证实，钙铝硅水化物和钠铝硅水化物是PSCMs的主要水化产物。FTIR和TG分析阐明了PSCMs在养护过程中的持续水化行为，而SEM观察揭示了硬化PSCM浆体中致密的微观结构。
