Role of biopolymers in enhancing multiscale characteristics of carbonation-cured cementitious composites
Role of biopolymers in enhancing multiscale characteristics of carbonation-cured cementitious composites
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DOI：
10.1016/j.cemconcomp.2022.104766
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发表时间：
2022-09
影响因子：
10.5
通讯作者：
Rakibul I. Khan;Muhammad Intesarul Haque;W. Ashraf;Surendra P. Shah;Navid Saleh
中科院分区：
文献类型：
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作者：
Rakibul I. Khan;Muhammad Intesarul Haque;W. Ashraf;Surendra P. Shah;Navid Saleh
本研究调查了两种天然生物聚合物的应用，即，聚多巴胺和纳米纤维素作为性能增强添加剂在碳酸化固化的普通波特兰水泥（OPC）-矿渣共混复合材料中的应用。一个多尺度的调查表明，这些生物聚合物的加入增加了纳米孔隙的形成，并减少了矩阵中的微孔量。还发现两种生物聚合物都增加了粘合剂中的反应程度。掺入0.05重量%的聚多巴胺增加了55%的复合材料的弯曲强度后，28天的固化。通过添加纳米纤维素也可以实现类似的弯曲强度改善（约66%）。此外，这些生物聚合物的添加使碳酸化复合材料的早期（约3天）抗压强度增加了近35%。据推测，聚多巴胺的加入通过与反应产物产生更强的键和通过稳定无定形CaCO 3来增强性能。另一方面，纳米纤维素的添加通过桥接微裂纹来提高强度。
This study investigates the application of two natural biopolymers, i.e., polydopamine and nanocellulose, as performance-enhancing additives in carbonation-cured ordinary Portland cement (OPC) - slag blended composites. A multiscale investigation reveals that the addition of these biopolymers increases the formation of nanoporosity and reduces amounts of microporosity in the matrixes. Both biopolymers are also found to increase the degree of reaction in the binders. Incorporation of 0.05 wt% polydopamine increases the flexural strength of the composites by 55% after 28 days of curing. A similar flexural strength improvement (∼66%) can also be achieved by adding nanocellulose. Moreover, the addition of these biopolymers increases the early age (∼3 days) compressive strength of the carbonated composites by nearly 35%. It is postulated that the addition of polydopamine enhances performance by creating stronger bonds with the reaction products and by stabilizing amorphous CaCO3. On the other hand, the addition of nanocellulose improves the strength by bridging microcracks.