Intrinsic 3D Prestressing: A New Route for Increasing Strength and Improving Toughness of Hybrid Inorganic Biocements
Intrinsic 3D Prestressing: A New Route for Increasing Strength and Improving Toughness of Hybrid Inorganic Biocements
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DOI：
10.1002/adma.201701035
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发表时间：
2017-09-20
影响因子：
29.4
通讯作者：
Gbureck, Uwe
中科院分区：
文献类型：
--
作者：
Schamel, Martha;Barralet, Jake E.;Gbureck, Uwe
水泥是消耗最多的资源，也是全球使用最广泛的材料。利用通常由钢制成的钢筋束来挤压预应力水泥材料的能力允许从这种脆性材料中创建高强度桥梁和地板。在这里，一个双固化水泥系统的基础上的水硬性水泥粉末与丝素蛋白水溶液的组合，固有地产生一个3D预应力在设置过程中，显着增韧水泥的点，它可以用剪刀切割，报告。研究表明，水泥凝固过程中离子浓度和pH值的变化可以产生具有弹性聚合物和刚性水泥综合性能的互穿丝素无机复合材料。这些混合水泥是自致密化的，并且在干燥时显示出典型的韧性断裂行为，并且在潮湿条件下具有高弹性，其机械性能（弯曲和压缩强度）比无丝心蛋白的水泥参照物高近一个数量级。
Cement is the most consumed resource and is the most widely used material globally. The ability to extrinsically prestress cementitious materials with tendons usually made from steel allows the creation of high-strength bridges and floors from this otherwise brittle material. Here, a dual setting cement system based on the combination of hydraulic cement powder with an aqueous silk fibroin solution that intrinsically generates a 3D prestressing during setting, dramatically toughening the cement to the point it can be cut with scissors, is reported. Changes of both ionic concentration and pH during cement setting are shown to create an interpenetrating silk fibroin inorganic composite with the combined properties of the elastic polymer and the rigid cement. These hybrid cements are self-densifying and show typical ductile fracture behavior when dry and a high elasticity under wet conditions with mechanical properties (bending and compressive strength) nearly an order of magnitude higher than the fibroin-free cement reference.