Improving the Mechanical Properties and Microstructure of High-Strength Concrete Using Waste Glass Powder and Biological Eggshell Powder

将生物蛋壳粉(BESP)与废玻璃粉(WGP)结合能有效降低碱–硅反应(ASR)现象。将生物蛋壳粉(BESP)与废玻璃粉(WGP)结合，对高强混凝土(HSC)的力学性能和微观结构进行改性研究。采用WGP和BESP结合替代水泥，研究了HSC的坍落度、抗压强度和劈裂抗拉强度的发展规律。此外，在微观方面，使用了SEM技术分析HSC水化产物的主要成分和微观形貌。结果表明：WGP和BESP结合会增加HSC的坍落度。10% BESP和10% WGP加入混凝土中，28天抗压强度为98.95 MPa，与对照组相比增强了22.92%。SEM结果显示，与对照组混凝土相比，BESP促进了WGP在混凝土中的二次水化，使HSC内部C-S-H凝胶含量增加，填充了微裂缝和转化了大孔隙变成了小孔隙，水化产物组成的空间结构更加密实，混凝土的整体性更好。Combining biological eggshell powder (BESP) with waste glass powder (WGP) can effectively mitigate the alkali-silica reaction (ASR) phenomenon. This study investigates the mechanical properties and microstructure of high-strength concrete (HSC) modified by the incorporation of BESP and WGP. The development patterns of slump, compressive strength, and split tensile strength of HSC were examined with the replacement of cement by varying proportions of WGP and BESP. Additionally, SEM techniques were employed to analyze the primary components and microscopic morphology of the hydration products in HSC. The results showed that the combination of WGP and BESP increased the slump of HSC. 10% BESP and 10% WGP added to concrete resulted in a 28-day compressive strength of 98.95 MPa, which was enhanced by 22.92% compared with the control group. SEM results showed that, compared with the control concrete, the BESP promoted the secondary hydration of WGP in the concrete, which led to an increase in the internal C-S-H gel content increased, filled microcracks, and transformed large pores into small pores, and the spatial structure composed of hydration products was denser, with better concrete integrity.