植草混凝土细观结构特征及其对抗压强度的影响

冯锡涛; 江辉; 刘瑶; 蔡协琦; 季国荣; 邓必伟

doi:10.11988/ckyyb.20231246

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长江科学院院报 ›› 2025, Vol. 42 ›› Issue (3) : 178-187. DOI: 10.11988/ckyyb.20231246

水工结构与材料

植草混凝土细观结构特征及其对抗压强度的影响

作者信息 +

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

Author information +

文章历史 +

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80 μm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。

Abstract

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 80 μm, 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.

导出引用

冯锡涛, 江辉, 刘瑶, 等. 植草混凝土细观结构特征及其对抗压强度的影响[J]. 长江科学院院报. 2025, 42(3): 178-187 https://doi.org/10.11988/ckyyb.20231246

FENG Xi-tao, JIANG Hui, LIU Yao, et al. Fine Structure Characteristics of Grass-planted Concrete and Its Effect on Compressive Strength[J]. Journal of Changjiang River Scientific Research Institute. 2025, 42(3): 178-187 https://doi.org/10.11988/ckyyb.20231246

中图分类号： TU528 (混凝土及混凝土制品)

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摘要

为探究水化硅酸钙(C-S-H)晶核剂对掺减水剂混凝土的影响,研究了不同钙硅比的水化硅酸钙对聚羧酸减水剂的吸附性能.通过120℃水热反应法制备水化硅酸钙,并采用XRD、SEM和29Si NMR对所制备的Ca/Si为1.0、1.3和1.6的水化硅酸钙样品进行表征;同时通过Zeta电势、总有机碳分析(TOC)和流动性分析探究了由钙硅比的变化对水化硅酸钙的Zeta电势和减水剂吸附性能以及对水泥浆体流动度的影响.试验结果表明,水化硅酸钙的链长和结晶度的优劣主要受到钙硅比的影响,钙硅比增大,链长变短,结晶度变差;水化硅酸钙的Zeta电势随着钙硅比增加而增大;C-S-H在超纯水中的电导率随钙硅比增加而变大;在不同氢氧化钙浓度的溶液中,Ca/Si为1.6的样品较1.0样品能吸附更多的减水剂;并且拥有较好的浆体流动性能.因此,高钙硅比的水化硅酸钙对聚羧酸减水剂拥有较强的吸附能力,并且对含聚羧酸减水剂的水泥浆体流动性能影响相对较小.

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You-zhi

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Wei-song

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