Choi Se-Jin, Bae Sung-Ho, Lee Jae-In, Bang Eun Ji, Choi Hoe Young, Ko Haye Min
Department of Architectural Engineering, Wonkwang University, 460 Iksan-daero, Iksan 54538, Korea.
Department of Chemistry, Wonkwang University, 460 Iksan-daero, Iksan 54538, Korea.
Polymers (Basel). 2022 Apr 28;14(9):1808. doi: 10.3390/polym14091808.
Cement concrete is the most commonly used building and construction material worldwide because of its many advantages. Over time, however, it develops cracks due to shrinkage and tension, which may lead to premature failure of the entire structure. Recently, the incorporation of polymers has been explored to improve the overall strength and durability of cement concrete. In this study, two types of chitosan-based bio-inspired polymers (a-BIP and b-BIP) were synthesized and mixed with cement mortar in different proportions (5-20%). The fluidity of the resulting mixtures and the properties of the hardened samples, such as the compressive and tensile strengths, drying shrinkage, and carbonation resistance, were evaluated. The characteristics of the polymers were tuned by varying the pH during their syntheses, and their structures were characterized using nuclear magnetic resonance spectroscopy, Fourier-transform infrared spectroscopy, and ultraviolet-visible spectroscopy. After 28 days of aging, all samples containing BIPs (35.9-41.4 MPa) had noticeably higher compressive strength than the control sample (33.2 MPa). The tensile strength showed a similar improvement (up to 19.1%). Overall, the mechanical properties and durability of the samples were separately dependent on the type and amount of BIP.
由于具有诸多优点，水泥混凝土是全球最常用的建筑材料。然而，随着时间的推移，它会因收缩和拉伸而产生裂缝，这可能导致整个结构过早失效。最近，人们探索了添加聚合物来提高水泥混凝土的整体强度和耐久性。在本研究中，合成了两种基于壳聚糖的仿生聚合物（a-BIP和b-BIP），并以不同比例（5%-20%）与水泥砂浆混合。评估了所得混合物的流动性以及硬化样品的性能，如抗压强度、抗拉强度、干燥收缩和抗碳化性能。通过在合成过程中改变pH值来调整聚合物的特性，并使用核磁共振光谱、傅里叶变换红外光谱和紫外可见光谱对其结构进行表征。老化28天后，所有含BIPs的样品（35.9 - 41.4 MPa）的抗压强度明显高于对照样品（33.2 MPa）。抗拉强度也有类似的提高（高达19.1%）。总体而言，样品的力学性能和耐久性分别取决于BIP的类型和用量。
