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楊   光^{1 ,2} ,  滕夢丹¹  ,  羅   薇^{1 ,2}  ,  井文強^{1 ,2}

( 1 .  西安歐亞學院 人居環境學院 ，陜西 西安 710065 ;

2.  城市智慧建造陜西省高校工程研究中心 ，陜西 西安 710065)

摘   要 ：該研究旨在探究納米二氧化硅  (NS) 和聚乙烯醇纖維  (PVA)對水泥基三元修補材料流動性及力學性能的影響，并利用計算機斷層掃描  (CT) 技術與 DRAGONFLY 圖像處理平臺對修補材料的孔隙結構進行三維重建和定量表征。研究選用普通硅酸鹽水泥  (OPC)、鋁酸鹽水泥  (CAC)和二水石膏(CS)作為膠凝材料， 通過改變 NS 和 PVA 的摻量，分析其對修補材料性能的影響。結果表明： NS 的最佳摻量為 3% ,  此時修補材料的 28 d 抗壓強度較三元體系提高了9. 4% ,  而 PVA 的最佳摻量為 0. 75% ,  能顯著提升修補材料的抗折和抗壓強度。CT 掃描和三維重建揭示了不同摻量下試件內部孔隙結構的空間分布特征，其中 NS 的加入顯著降低了孔隙率，而 PVA 的加入則增加了孔隙率。本研究為水泥基修補材料的優化提供了實驗依據，并對理解材料內部結構與宏觀性能的關系提供了新視角。

關鍵詞：修補材料 ；納米二氧化硅 ；聚乙烯醇纖維 ；CT 掃描 ；定量表征

中圖分類號：TU528 . 59            

文獻標志碼：A           

文章編號： 1005- 8249   (2024)  06- 0006- 08

DOI:10. 19860/j.cnki.issn1005 - 8249.2024.06.002

YANG Guang^{1 , 2}  ,  TENG Mengdan¹  ,  LUO Wei ^{1 , 2}  ,  JING Wenqiang^{1 , 2}

( 1 . School of Human Settlements and Civil Engineering ,  Xi ’an Eurasia University ,

Xi ’an 710065 ,  China;  2. Engineering  Research Center of Urban Intelligent

Construction ,  Universities of Shaanxi Province ,  Xi ’an 710065 ,  China)

Abstract: The aim of this study is to investigate the effects of nanosilica (NS) and polyvinyl alcohol fiber (PVA) on the flow and mechanical properties of cementitious ternary repair materials, and to reconstruct the pore structure of the repair materials in three dimensions and quantitatively characterize them using computed tomography (CT) technology and DRAGONFLY image processing platform. Ordinary silicate cement (OPC), cement aluminate (CAC) and gypsum dihydrate (CS) were selected as cementitious materials for the study, and their effects on the properties of the repair materials were analyzed by changing the dosage of NS and PVA. The results showed that the optimal dosage of NS was 3%, at which the 28-day compressive strength of the repair material increased by 9.4% compared with the ternary system, while the optimal dosage of PVA was 0.75%, which could significantly improve the flexural and compressive strength of the repair material.CT scanning and three-dimensional reconstruction revealed the spatial distribution characteristics of the internal pore structure of the specimens under different dosages, in which the addition of NS significantly reduced the porosity, while the addition of PVA increased the porosity. The addition of NS significantly decreased the porosity, while the addition of PVA increased the porosity. This study provides an experimental basis for the optimization of cementitious repair materials and a new perspective for understanding the relationship between the internal structure and macroscopic properties of materials.

Keywords: repair materials; nanosilica; polyvinyl alcohol fibers; CT scan; quantitative characterization

*基金項目：2022 年陜西省大學生創新創業項目  (S202212712001 ) ;  西安歐亞學院技術服務專項項目  (OYGJS- 2021007) ;  西 安歐亞學院科研創新團隊  (2021 XJD01 ) ;  西安歐亞學院科研平臺  (2022XJPT01 ) 。

作者簡介：楊   光 (1981 —) , 男，碩士，副教授，研究方向：水泥基膠凝材料及應用。

收稿日期：2023- 05- 05