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首页> 外文会议>International Seminar on Composite Materials in Concrete Construction; Sep 5-6, 2002; Scotland, UK >INORGANIC POLYMER COMPOSITES IN CONCRETE CONSTRUCTION: PROPERTIES, OPPORTUNITIES AND CHALLENGES
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INORGANIC POLYMER COMPOSITES IN CONCRETE CONSTRUCTION: PROPERTIES, OPPORTUNITIES AND CHALLENGES

机译：混凝土建筑中的无机聚合物复合材料：性能，机遇和挑战

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摘要

Use of high-strength composites in concrete construction is gaining worldwide acceptance. The major application areas are repair and retrofit to improve the performance or correct deficiencies. These composites have very high specific strength and do not corrode. The major disadvantages are the weakness of the resin under high temperature and UV radiation. Recent advances led to the development of high temperature matrices. The results reported in this paper deal with composites made with inorganic polymer that is not only high temperature resistant but also environmental friendly. The water-based system is completely nontoxic. The performance of this adhesive is compared to an organic adhesive for strengthening plain and reinforced concrete beams using carbon fibre sheets. The comparison is made using the experimental results of plain and reinforced concrete beams strengthened with bonded carbon fibre sheets and tested to failure under flexural loading. Strength, failure pattern, and cracking of beams strengthened with the two systems are compared. The results indicate that the inorganic adhesive is as effective in increasing the strength and stiffness of reinforced concrete beams as the organic adhesive. For plain concrete, the behaviours of the two systems are comparable for equivalent fibre volume fraction. The inorganic matrix has a tensile strain capacity of only 0.07%, whereas the organic matrix has a strain capacity of about 4.8%. The brittleness of the inorganic matrix results in crack formation in the composite and a minimum build-up of strain along the interface of the composite and concrete. This phenomenon leads to failure of the composite by rupture of the carbon sheets instead of delamination, which occurs in most of the organic matrix repaired beams. Based on the results available so far, the inorganic matrix composite can be used in standard repairs of reinforced and prestressed concrete structures. The challenge is to create field workable system that can compete with the inorganic systems.
机译：在混凝土结构中使用高强度复合材料已获得世界范围的认可。主要应用领域是维修和翻新，以提高性能或纠正缺陷。这些复合材料具有很高的比强度，并且不会腐蚀。主要缺点是树脂在高温和紫外线辐射下的弱点。最近的进展导致了高温基质的发展。本文报道的结果涉及由无机聚合物制成的复合材料，该复合材料不仅耐高温，而且环保。水基系统是完全无毒的。将该胶粘剂的性能与使用碳纤维片增强普通和钢筋混凝土梁的有机胶粘剂进行了比较。比较是利用碳纤维薄板加固的普通混凝土梁和钢筋混凝土梁的试验结果进行的，并在弯曲载荷下进行了破坏测试。比较了两个系统加固后的强度，破坏模式和梁的开裂。结果表明，无机胶粘剂与有机胶粘剂一样有效地提高了钢筋混凝土梁的强度和刚度。对于普通混凝土，在等效纤维体积分数下，这两个系统的性能相当。无机基质的拉伸应变能力仅为0.07％，而有机基质的拉伸能力约为4.8％。无机基质的脆性导致复合材料中形成裂纹，并且沿着复合材料和混凝土的界面的应变最小化。这种现象导致复合材料的破坏，原因是碳板破裂而不是分层，而分层发生在大多数有机基体修复梁中。根据目前可获得的结果，无机基质复合材料可用于钢筋混凝土和预应力混凝土结构的标准修复。挑战在于创建可与无机系统竞争的现场可行系统。

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