页岩陶粒对高延性地聚物复合材料性能的影响

doi:10.16552/j.cnki.issn1001-1625.2025.0522

摘要/Abstract

摘要： 页岩陶粒(SC)作为一种轻质多孔且兼具一定强度的骨料,可用作地聚物复合材料的附加缺陷,诱导基体产生饱和开裂行为。本文设计制作了9组不同SC掺量及粒径分布的高延性地聚物复合材料(HDGC)试件,进行了不同龄期HDGC单轴压缩及拉伸试验、扫描电子显微镜和能谱检测,探究了SC掺量及粒径分布对HDGC抗压强度、抗拉强度、拉伸应变、裂缝形态和微观结构的影响规律。结果表明:SC与基体存在界面反应,随SC粒径减小,SC-基体界面微观结构更为致密;随SC掺量增加,HDGC抗拉强度与拉伸应变均呈先增大后减小规律,但这些指标随SC粒径增大基本呈减小趋势,其中SC掺量为40%(质量分数)、粒径分布为0.15~<0.30 mm的HDGC抗拉强度可达5.8 MPa,极限拉伸应变可达9.3%。本文可为绿色高性能地聚物复合材料设计应用提供理论参考。

关键词: 高延性地聚物, 页岩陶粒, 抗压强度, 抗拉强度, 微观结构, 界面过渡区

Abstract: Shale ceramsite (SC), functioning as a lightweight, porous aggregate with moderate strength, serves as intentional defects in geopolymer composites to induce saturated cracking behavior within the matrix. This study designed and fabricated 9 groups of high ductility geopolymer composite (HDGC) specimens with varying SC content and particle size distributions. Uniaxial compression tests, tensile tests, scanning electron microscopy, and energy-dispersive spectroscopy analyses were conducted at different curing ages to investigate the effects of SC content and particle size distribution on HDGC’s compressive strength, tensile strength, tensile strain, crack morphology, and microstructure. Results show that there is an interface reaction between SC and the matrix, and as the SC particle size decreases, the microstructure of SC-matrix interfacet is more compact. With the increase of SC content, the tensile strength and tensile strain of HDGC initially increase and then decreast. Whereas these properties generally decrease with the increase of SC particle size. Notably, the tensile strength and ultimate tensile strain of HDGC with 40% (mass fraction) SC and particle size distribution of 0.15~<0.30 mm achieve 5.8 MPa and 9.3%, respectively. This study can provide a theoretical reference for the design and application of green high-performance geopolymer composites.

Key words: high ductility geopolymer, shale ceramsite, compressive strength, tensile strength, microstructure, interfacial transition zone

中图分类号:

TU526

王兆辉, 王善伟, 王杰, 韩衍童, 代浩宇. 页岩陶粒对高延性地聚物复合材料性能的影响[J]. 硅酸盐通报, 2025, 44(12): 4384-4394.

WANG Zhaohui, WANG Shanwei, WANG Jie, HAN Yantong, DAI Haoyu. Influence of Shale Ceramsite on Properties of High Ductility Geopolymer Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(12): 4384-4394.

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