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Glass concrete thin sheets reinforced with prestressed aramid fabrics.

机译：用预应力芳纶织物增强的玻璃混凝土薄板。

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Thin sheet concrete products are receiving increased attention because of the large number of potential applications. By using crushed glass as aggregate, a multitude of different esthetic effects can be produced, which again open up numerous architectural and decorative uses. Such thin sheets are most effectively reinforced with fiber mesh, whether made of polypropylene, AR-glass, or other types of materials.; The experimental project presented in this work explored the possibilities of prestressing thin sheet glass concrete products with fabrics. Aramid fibers, known under their trade names Kevlar, Twaron, and Technora, have been found to be well suited for prestressing applications in the form of fiber-reinforced polymers (FRP). For prestressing thin sheets, however, the material was utilized to date in a more unprotected form, covered just with a thin coating agent.; The constitutive materials, aramid and glass concrete are introduced. Especially the deformation mechanisms of aramid fibers and their relaxation properties are explored in great detail. Glass concrete, which by now is produced commercially, was utilized as the matrix for the prestressed composite, because it offers several advantages beside its esthetic potential, such as excellent workability, superior durability and high-early strength. Glass concrete beams with cross-sections of 1/4 in x 1 in have been produced with prestress levels varying from 0 to 2 ksi.; It has been observed that a large amount of the prestress force in the fiber rovings is lost during the first few hours of hydration, while they are still anchored against the formwork. Once the concrete has hardened, however, the prestress level stabilized. Understanding the interaction mechanisms between aramid fibers and hydrating concrete is critical to successfully produce thin sheets prestressed with high-performance polymeric fibers. The mechanical properties of prestressed thin beams correspond well with traditional prestressed concrete theory during three-point bending tests. The prestress delays the formation of distributed cracking and greatly enhances the stiffness of the section in the cracked state.
机译：由于大量潜在的应用，薄板混凝土产品受到越来越多的关注。通过使用碎玻璃作为骨料，可以产生多种不同的美学效果，这又开辟了许多建筑和装饰用途。这种薄板可以用纤维网最有效地增强，无论是聚丙烯，AR玻璃还是其他类型的材料。这项工作中提出的实验项目探索了用织物对薄玻璃混凝土制品进行预应力的可能性。已发现以商品名Kevlar，Twaron和Technora闻名的芳纶纤维非常适合以纤维增强聚合物（FRP）的形式用于预应力应用。然而，对于预应力薄板，迄今为止，该材料以更不受保护的形式被利用，仅被薄涂层剂覆盖。介绍了本构材料，芳纶和玻璃纤维混凝土。特别是对芳族聚酰胺纤维的变形机理及其松弛特性进行了详细的探讨。如今已商业化生产的玻璃混凝土被用作预应力复合材料的基质，因为它除了具有美学潜力外还具有其他优势，例如出色的可加工性，优异的耐久性和高早期强度。已生产出横截面为1/4 in x 1 in的玻璃混凝土梁，预应力水平为0至2 ksi。已经观察到，在水合的最初几个小时中，纤维粗纱中的大量预应力消失了，而纤维粗纱仍然锚固在模板上。但是，一旦混凝土硬化，预应力水平就会稳定。理解芳族聚酰胺纤维与水合混凝土之间的相互作用机理对于成功生产由高性能聚合物纤维预应力的薄板至关重要。在三点弯曲试验中，预应力薄梁的力学性能与传统的预应力混凝土理论非常吻合。预应力会延迟分布裂纹的形成，并大大提高裂纹状态下截面的刚度。

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