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Graphene Oxide-Enhanced Cementitious Materials under External Sulfate Attack: Implications for Long Structural Life
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-09-17 , DOI: 10.1021/acsanm.0c01885 Hongyan Zeng 1, 2 , Yuanming Lai 1, 2 , Shen Qu 3 , Yinghong Qin 4
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-09-17 , DOI: 10.1021/acsanm.0c01885 Hongyan Zeng 1, 2 , Yuanming Lai 1, 2 , Shen Qu 3 , Yinghong Qin 4
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Graphene oxide (GO) nanosheets are experimentally added into cement materials to enhance the sulfate resistance, and a corresponding chemomechanical model is proposed to predict the structural life expectancy. Experimental investigations show that GO nanosheets with a dosage of 0.03% by weight of cement refine the pores, inhibit the microcracks, and improve sulfate resistance of mortars remarkably. The proposed model is designed for cement materials modified by nanosheets, including the influence of the size, concentration, arrangement, and direction of nanosheets on the tortuosity and diffusion coefficient. To explain the mechanical deterioration, the model considers the transport properties at undamaged, pore-filling, stress-generated, and crack-growing stages. Validating against the experimental data, we found the proposed model to be more suitable than the Mobasher–Tixier (MT) model in simulating the response of cement-based materials under sulfate attack, especially in the case of sheet-like nanoadditives. Numerical results infer that the addition of 0.03 wt % GO nanosheets can improve the structural life by 2.3 times as samples are immersed in 5 wt % sulfate solution.
中文翻译：
外部硫酸盐侵蚀下氧化石墨烯增强的胶凝材料：对长结构寿命的影响
通过实验将氧化石墨烯（GO）纳米片添加到水泥材料中以增强耐硫酸盐性，并提出了相应的化学机械模型来预测结构寿命。实验研究表明，水泥用量为0.03％（重量）的GO纳米片可以细化毛孔，抑制微裂纹并显着提高砂浆的抗硫酸盐性。提出的模型设计用于由纳米片改性的水泥材料，包括纳米片的尺寸，浓度，排列和方向对曲折度和扩散系数的影响。为了解释机械劣化，该模型考虑了在未损坏，孔隙填充，应力产生和裂纹扩展阶段的传输特性。根据实验数据进行验证，我们发现拟议的模型比Mobasher-Tixier（MT）模型更适合模拟水泥基材料在硫酸盐侵蚀下的响应，特别是在片状纳米添加剂的情况下。数值结果表明，当将样品浸入5 wt％的硫酸盐溶液中时，添加0.03 wt％的GO纳米片可以将结构寿命提高2.3倍。
更新日期：2020-10-25
中文翻译：
外部硫酸盐侵蚀下氧化石墨烯增强的胶凝材料：对长结构寿命的影响
通过实验将氧化石墨烯（GO）纳米片添加到水泥材料中以增强耐硫酸盐性，并提出了相应的化学机械模型来预测结构寿命。实验研究表明，水泥用量为0.03％（重量）的GO纳米片可以细化毛孔，抑制微裂纹并显着提高砂浆的抗硫酸盐性。提出的模型设计用于由纳米片改性的水泥材料，包括纳米片的尺寸，浓度，排列和方向对曲折度和扩散系数的影响。为了解释机械劣化，该模型考虑了在未损坏，孔隙填充，应力产生和裂纹扩展阶段的传输特性。根据实验数据进行验证，我们发现拟议的模型比Mobasher-Tixier（MT）模型更适合模拟水泥基材料在硫酸盐侵蚀下的响应，特别是在片状纳米添加剂的情况下。数值结果表明，当将样品浸入5 wt％的硫酸盐溶液中时，添加0.03 wt％的GO纳米片可以将结构寿命提高2.3倍。
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