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改性牛粪纤维对碱激发矿渣砂浆强度和自收缩的影响

Effect of Modified Cow Dung Fibers on Strength and Autogenous Shrinkage of Alkali-Activated Slag Mortar.

作者信息

Li Kang, Yang Zhengxian, Yan Xueyuan, Xu Liying, Briseghella Bruno, Marano Giuseppe Carlo

机构信息

Joint International Research Laboratory of Deterioration and Control of Coastal and Marine Infrastructures and Materials, College of Civil Engineering, Fuzhou University, Fuzhou 350108, China.

School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China.

出版信息

Materials (Basel). 2023 Oct 22;16(20):6808. doi: 10.3390/ma16206808.

DOI:10.3390/ma16206808
PMID:37895789
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10608751/
Abstract

Alkali-activated slag (AAS) presents a promising alternative to ordinary Portland cement due to its cost effectiveness, environmental friendliness, and satisfactory durability characteristics. In this paper, cow dung waste was recycled as a renewable natural cellulose fiber, modified with alkali, and then added to AAS mortar. The physico-chemical characteristics of raw and modified cow dung fibers were determined through Fourier transform infrared (FTIR), X-ray diffraction (XRD), and Scanning electron microscope (SEM). Investigations were conducted on the dispersion of cow dung fibers in the AAS matrix, as well as the flowability, strength, and autogenous shrinkage of AAS mortar with varying cow dung fiber contents. The results indicated that modified fiber has higher crystallinity and surface roughness. The ultrasonic method showed superior effectiveness compared to pre-mixing and after-mixing methods. Compared with raw cow dung fibers, modified fibers led to an increase of 11.3% and 36.3% of the 28 d flexural strength and compressive strength of the AAS mortar, respectively. The modified cow dung fibers had a more significant inhibition on autogenous shrinkage, and the addition of 2 wt% cow dung fibers reduced the 7 d autogenous shrinkage of the AAS paste by 52.8% due to the "internal curing effect." This study provides an alternative value-added recycling option for cow dung fibers as a potential environmentally friendly and sustainable reinforcing raw material for cementitious materials, which can be used to develop low autogenous shrinkage green composites.

摘要

碱激发矿渣（AAS）因其成本效益、环境友好性和令人满意的耐久性特性，成为普通硅酸盐水泥的一种有前景的替代品。本文将牛粪废料回收作为可再生天然纤维素纤维，用碱进行改性，然后添加到AAS砂浆中。通过傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和扫描电子显微镜（SEM）测定了原始和改性牛粪纤维的物理化学特性。研究了牛粪纤维在AAS基体中的分散情况，以及不同牛粪纤维含量的AAS砂浆的流动性、强度和自收缩性能。结果表明，改性纤维具有更高的结晶度和表面粗糙度。超声法比预混合和后混合法显示出更高的有效性。与原始牛粪纤维相比，改性纤维使AAS砂浆的28天抗折强度和抗压强度分别提高了11.3%和36.3%。改性牛粪纤维对自收缩有更显著的抑制作用，由于“内部养护效应”，添加2 wt%的牛粪纤维使AAS浆体的7天自收缩降低了52.8%。本研究为牛粪纤维提供了一种增值回收选择，作为水泥基材料潜在的环境友好和可持续增强原料，可用于开发低自收缩绿色复合材料。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ea7/10608751/12bab1058bff/materials-16-06808-g018.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ea7/10608751/d42b63583d2e/materials-16-06808-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ea7/10608751/e9c18b1e5711/materials-16-06808-g012.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ea7/10608751/337fe1f975aa/materials-16-06808-g014.jpg
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