Characterization and resistance against the combined effect of chloride erosion and freeze–thaw cycling of sticky rice lime paste enhanced by cellulose fiber and fly ash. (15th April 2023)

• Record Type: Journal Article
• Authors: Lu, Zhe; Wang, Shanwei; Liu, Bo; Wang, Sheliang; Li, Binbin
• Is Part Of: Journal of building engineering. Volume 65(2023)
• Publication Date: 2023-04-15
• Subjects: Ancient buildings -- Sticky rice lime -- Chloride erosion -- Freeze–thaw cycle -- Cellulose fiber -- Pore structure; XRD X-ray diffraction -- FTIR Fourier transform infrared -- NMR Nuclear magnetic resonance -- SEM Scanning electron microscope -- RDEM Relative dynamic elasticity modulus -- WF The freeze-thaw cycles condition -- SF The combined condition of chloride erosion and freeze–thaw cycles; Building -- Periodicals; 690.05
• DOI: 10.1016/j.jobe.2022.105776
• Languages: English
• ISSNs: 2352-7102

Abstract

Abstract: The primary objective of this paper is to research the characterization and durability enhancement of traditional sticky rice air lime paste mixed with cellulose fiber and fly ash. The changes in the physical and mechanical properties, pore structure and microstructure and the deterioration mechanism of the durability under the combined action of chloride erosion and freeze–thaw cycling of modified sticky rice air lime paste are studied by means of macro test, NMR, XRD, FTIR and SEM. The results show that cellulose fibers can effectively reduce the drying shrinkage, improve the compressive and flexural strength, and resist the expansion of cracks caused by freeze–thaw cycles. However, when the fiber is added alone, the water absorption of the fiber will delay the carbonization rate and adversely affect the frost resistance of the paste. The mixture of fly ash and fiber can be used to fill the pores, solidify chloride ions, reduce the adverse effects on frost resistance caused by the fiber's water absorption, and enhance the strength and durability of the paste. The modified paste mixed with 1% fiber and 25% fly ash has favorable strength and resistance to the combined effect of chloride erosion and freeze–thaw cycling, which has a certain reference significance for the design and application of ancient masonry building repair materials in complex environments. Highlights: Modified paste is designed based on ancient formulas. The properties of paste with fly ash and cellulose fiber are studied. The microstructure of modified paste is analyzed by NMR, XRD, FTIR and SEM. The resistance of modified paste against the combined effect of chloride erosion and freeze-thaw cycling is investigated.