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浙江大学学报(工学版)
浙江大学学报(工学版)  2023, Vol. 57 Issue (11): 2235-2243    DOI: 10.3785/j.issn.1008-973X.2023.11.011
环境与土木工程     
水泥浆体中石墨烯纳米片团聚的 X射线计算机断层扫描解析
张华献1,2(),高建科1,2,何建国1,2,徐铖基2,3,党楠茜2,3,曾强3,*()
1. 浙江交工金筑交通建设有限公司，浙江 杭州 310051
2. 浙江大学-浙江交工协同创新联合研究中心，浙江 杭州 310058
3. 浙江大学 建筑工程学院，浙江 杭州 310058
X-ray computed tomography analysis of graphene nanoplatelets agglomeration in cement paste
Hua-xian ZHANG1,2(),Jian-ke GAO1,2,Jian-guo HE1,2,Cheng-ji XU2,3,Nan-xi DANG2,3,Qiang ZENG3,*()
1. Zhejiang Tongtu Traffic Engineering Co. Ltd, Hangzhou 310051, China
2. ZJU-ZCCC Institute of Collaborative Innovation, Hangzhou 310058, China
3. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
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摘要：

为了实现纳米颗粒在水泥基材料中的均匀分散以及探究如何无损地检验纳米颗粒的分散程度，利用石墨烯纳米片（GNPs）作为代表性的碳纳米添加剂，设置3种不同的超声分散方式 (VSD)?直接、间接和直接-间接结合分散，得到具有不同GNPs分散状态的水泥浆体. 利用X射线计算机断层扫描技术（XCT）对孔隙和石墨烯团聚体进行无损表征；基于两者的形状特征差异（球形度和紧密度）筛分出GNPs团聚体，解析其分布、数量和粒径等；利用扫描电子显微镜（SEM）对GNPs团聚体形貌进行观察；进行抗压强度测试以验证GNPs分散情况对宏观性能的影响. XCT结果表明基于形状特征能够无损地区分出GNPs团聚体，直接分散作用下GNPs团聚体数量和累计体积均最小；SEM观测结果表明GNPs团聚体具有复杂多样的形貌；力学测试结果表明抗压强度与分散质量呈正相关关系.
关键词： 水泥基材料;  石墨烯;  团聚体;  X射线断层扫描（XCT）;  形状特征    
Abstract:

Graphene nanoplatelets (GNPs) were used as a representative carbon nano-additive, to achieve uniform dispersion of nanoparticles in cement-based materials and investigate non-destructive methods for assessing the degree of dispersion. And three different ultrasonic dispersion (USD) methods were set up: direct, indirect and direct-indirect combined USD. These methods were utilized to produce cement pastes with varying degrees of GNPs dispersion. X-ray computed tomography (XCT) was employed to characterize pores and GNPs agglomerates non-destructively. Based on differences in morphology features (sphericity and compactness), GNPs agglomerates were identified and their distribution, quantity and size were analyzed. Scanning electron microscopy (SEM) was used to observe the morphology of GNPs agglomerates. Compressive strength testing was conducted to demonstrate the influence of GNPs dispersion on macroscopic properties. The XCT results show that GNPs agglomerates can be distinguished non-destructively based on shape features. The results also indicate that the number and cumulative volume of GNPs agglomerates are the smallest under direct USD. SEM observation results show that GNPs agglomerates have complex and diverse morphologies. Mechanical results indicate the positive correlation between compressive strength and dispersion quality.
Key words: cement-based materials    graphene    agglomerate    X-ray computed tomography (XCT)    shape features
收稿日期: 2022-12-14 出版日期: 2023-12-11
CLC:  TU 599  
基金资助: 浙江大学-浙江交工协同创新中心资助项目(ZDJG2021008)；国家自然科学基金重点资助项目(52038004)
通讯作者: 曾强     E-mail: zhuaxian@zjjtgc.com;cengq14@zju.edu.cn
作者简介: 张华献（1983—），男，高级工程师，从事混凝土材料和结构性能研究. orcid.org/0009-0005-2291-7279. E-mail： zhuaxian@zjjtgc.com
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引用本文:

张华献,高建科,何建国,徐铖基,党楠茜,曾强. 水泥浆体中石墨烯纳米片团聚的 X射线计算机断层扫描解析[J]. 浙江大学学报(工学版), 2023, 57(11): 2235-2243.

Hua-xian ZHANG,Jian-ke GAO,Jian-guo HE,Cheng-ji XU,Nan-xi DANG,Qiang ZENG. X-ray computed tomography analysis of graphene nanoplatelets agglomeration in cement paste. Journal of ZheJiang University (Engineering Science), 2023, 57(11): 2235-2243.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2023.11.011    或    https://www.zjujournals.com/eng/CN/Y2023/V57/I11/2235

化学组成 wB/% 矿物组成 wB%
SiO2 22.15 C3S 56.54
Al2O3 4.51 C2S 20.87
Fe2O3 3.39 C3A 6.22
CaO 65.36 C4AF 10.31
MgO 2.31 — —
SO3 0.46 — —
Na2Oeq 0.49 — —
f-CaO 0.95 — —
表 1  水泥的化学和矿物组成
参数 数值 参数 数值
D/μm 5~10 ρt/(g·cm?3) 0.075
T/nm 3~10 ρa/(g·cm?3) 0.050
SSA/(m2·g?1) 31.657 — —
表 2  GNPs的物理性能
图 1  不同超声分散方式和水泥试样制备过程示意图
图 2  X射线计算断层扫描测试和分析流程
图 3  所选分析区域的灰度分布图
图 4  缺陷球形度与体积之间的关系
图 5  缺陷紧密度与球形度之间的关系以及GNPs团聚体示意图
图 6  缺陷紧密度与体积之间的关系
图 7  不同形状参数条件对应的缺陷3D图
图 8  GNPs团聚体量化统计信息
图 9  断面微观形貌和GNPs团聚体的形貌
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