Huang Jian, Xu Guangfeng, Chen Shujie, Yu Demei, Fu Tengfei, Feng Chao, Wang Yulin
The Fifth Construction Co.Ltd. of CCCC Fourth Harbor Engineering Co., Ltd., Fuzhou 350008, China.
College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China.
Materials (Basel). 2024 May 9;17(10):2234. doi: 10.3390/ma17102234.
The production of manufactured sand and stone processing can cause dust pollution due to the generation of a significant amount of stone powder. This dust (mainly granite powder) was collected and incorporated as a cement replacement into mass-manufactured sand concrete in order to enhance the mechanical properties and microstructures. The heat of the hydration was measured by adding the granite powder into the cementitious material system. The mechanical properties, autogenous shrinkage, and pore structures of the concrete were tested. The results showed that the mechanical strength of the concrete increased first and then decreased with the increase in granite powder content. By replacing the 5% cement with the granite powder, the 28 d compressive and flexural strength increased by 17.6% and 20.9%, respectively. The autogenous shrinkage was mitigated by the incorporation of the 10% granite powder and decreased by 19.7%. The mechanism of the granite powder in the concrete was studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), and mercury intrusion porosimetry (MIP). The porosity decreased significantly within the 10% granite powder. A microstructure analysis did not reveal a change in the type of hydration products but rather that the granite powder played a role in the microcrystalline nucleation during the hydration process.
机制砂生产和石料加工会因产生大量石粉而造成粉尘污染。收集了这种粉尘（主要是花岗岩粉）并将其作为水泥替代品掺入大规模生产的机制砂混凝土中，以提高其力学性能和微观结构。通过将花岗岩粉添加到胶凝材料体系中来测量水化热。对混凝土的力学性能、自生收缩和孔隙结构进行了测试。结果表明，随着花岗岩粉含量的增加，混凝土的力学强度先增加后降低。用花岗岩粉替代5%的水泥，28天抗压强度和抗折强度分别提高了17.6%和20.9%。掺入10%的花岗岩粉可减轻自生收缩，自生收缩降低了19.7%。通过X射线衍射（XRD）、扫描电子显微镜（SEM）和压汞法（MIP）研究了花岗岩粉在混凝土中的作用机理。在10%花岗岩粉范围内孔隙率显著降低。微观结构分析未发现水化产物类型有变化，而是表明花岗岩粉在水化过程中起到微晶成核的作用。
