植草混凝土细观结构特征及其对抗压强度的影响  

Fine Structure Characteristics of Grass-planted Concrete and Its Effect on Compressive Strength

作　　者：冯锡涛 江辉[1] 刘瑶[1] 蔡协琦 季国荣 邓必伟 FENG Xi-tao;JIANG Hui;LIU Yao;CAI Xie-qi;JI Guo-rong;DENG Bi-wei(National and Local Joint Engineering Laboratory of Hydraulic Engineering Safety and Efficient Utilization of Water Resources in Poyang Lake Basin,Nanchang Institute of Technology,Nanchang 330099,China)

机构地区：[1]南昌工程学院鄱阳湖流域水工程安全与资源高效利用国家地方联合工程实验室,南昌330099

出　　处：《长江科学院院报》2025年第3期178-187,共10页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(51869012,42161055)。

摘　　要：植草混凝土细观结构是影响混凝土抗压强度的关键因素,研究其物理化学性能,对植生型多孔结构的混凝土性能提升具有重要意义。对植草混凝土进行了Rapid Air 457孔隙结构测定、SEM电镜、XRD衍射、力学性能试验与分析,结果表明:硅灰石粉和粉煤灰显著优化了植草混凝土的细观孔隙结构,随着硅灰石粉和粉煤灰掺量的增加,细观孔隙含量分别降低至0.85%和0.22%,平均孔径均可以减小至80μm以下,并引起间距系数发生改变,进而促使植草混凝土的28 d最大抗压强度分别提升至10.1 MPa和11.3 MPa。根据电镜和衍射试验结果,结合DES分析,发现植草混凝土中钙硅比减小,证实了2种掺合料的水化产物使得植草混凝土胶凝材料内部结构更加致密,并对植草混凝土抗压强度产生积极影响,填补了植草混凝土细观孔隙结构研究的空白。The fine structure of grass-planted concrete plays a crucial role in determining its compressive strength.Understanding its physicochemical properties is essential for enhancing the performance of porous grass-planted concrete.We investigated the pore structure using Rapid Air 457 device,examined the SEM,XRD diffraction,and mechanical properties of grass-planted concrete.Results revealed that increasing the dosage of silica fume powder and fly ash reduced the finescale pore content to 0.85% and 0.22%,respectively.The average pore size decreased to less than 80μm,and the spacing coefficient was significantly altered,which enhanced the 28-day maximum compressive strength of the grass-planted concrete up to 10.1 MPa and 11.3 MPa,respectively.SEM and XRD diffraction tests together with Dessication Susceptibility(DES)analysis unveiled that the mass ratio of Ca to Si in grass-planted concrete declined,indicating that the hydration products of silica fume powder and fly ash densified the internal structure of the cementitious material of grass-planted concrete,positively affecting its compressive strength.This research fills a gap in the study of the fine pore structure of grass-planted concrete.

关 键 词：植草混凝土 细观结构 抗压强度 硅灰石粉 粉煤灰 

分 类 号：TU528[建筑科学—建筑技术科学]