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The influence of portlandite, calcite, quartz and ettringite inclusions on the multiscale mechanical behaviors of C-S-H matrix
Cement and Concrete Research ( IF 10.9 ) Pub Date : 2025-01-04 , DOI: 10.1016/j.cemconres.2024.107781
Zhe Zhang, Yuchen Hu, Lianyao Xiong, Guoqing Geng

C-S-H is the primary binder in cement mixed with additional phases. It is essential to understand how different phases impact cement strength. This study presents an innovative method for preparing a binary system doped with C-S-H and additional phases to study the effects of these phases on the composite's strength. By blending C-S-H with various minerals, we control mineral content precisely. Using multiscale techniques including atomic force microscopy (AFM), hardness and modulus measurements, we quantify the effects of minerals on C-S-H composites. Findings reveal the intrinsic moduli of these phases significantly influence composites' hardness, while cohesion affect compression modulus. Notably, quartz has a higher intrinsic modulus but lower cohesion than C-S-H, resulting in larger hardness but lower compression modulus. Ettringite shows reduced hardness and compression modulus, while calcite and portlandite's effects remain ambiguous due to lower cohesion but larger intrinsic modulus. These insights offer pathways for enhancing cementitious composites' performance.

中文翻译:


硅酸盐、方解石、石英和钙镁石包裹体对 C-S-H 基质多尺度力学行为的影响



CSH 是与其他相混合的水泥中的主要粘合剂。了解不同相如何影响水泥强度至关重要。本研究提出了一种制备掺杂 C-S-H 和其他固定相的二元体系的创新方法,以研究这些固定相对复合材料强度的影响。通过将 C-S-H 与各种矿物质混合,我们精确控制矿物质含量。使用包括原子力显微镜 (AFM)、硬度和模量测量在内的多尺度技术,我们量化了矿物对 CSH 复合材料的影响。研究结果表明,这些相的本征模量显著影响复合材料的硬度,而内聚力则影响压缩模量。值得注意的是,与 CSH 相比,石英具有更高的本征模量但较低的内聚力,因此硬度较高,但压缩模量较低。钙石的硬度和压缩模量降低,而方解石和硅酸盐的影响由于内聚力较低但内禀模量较大,因此仍然模棱两可。这些见解为提高水泥基复合材料的性能提供了途径。
更新日期:2025-01-04
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