林薇薇
中国腐蚀与防护学报
聚脲聚氨酯环氧涂料用於混凝土钢筋防腐蚀的研究林薇薇（浙江大学高分子系杭州３１００２７）钢筋混凝土建筑物耐久性下降的主要原因之一是增强钢筋的腐蚀。因为混凝土是多孔性凝胶体，空气中的氧、湿气和其它腐蚀介质能通过孔隙和细裂缝侵蚀钢筋，而钢筋变成铁锈时体积要增大２～４倍，结果产生内应力，使混凝土开裂，又进一步加剧腐蚀，造成钢筋混凝土构件破损失效。为此，目前已采用一些方法来减缓钢筋的腐蚀速度［１］。钢?...
关键词:
null
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Epoxy；Polyurea
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Polyurethane
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Concrete
唐咸燕
中国腐蚀与防护学报
对于市政排污管道而言,硫酸杆菌往往是造成其腐蚀的一个主要原因.本文总结了近年来混凝土硫酸杆菌腐蚀的研究进展.归纳认为针对混凝土硫酸杆菌腐蚀的研究大致可以分为两种实验研究方法:细菌模拟测试和现场暴露测试.同时还介绍了混凝土硫酸杆菌的腐蚀机理以及硫酸杆菌侵蚀与化学硫酸侵蚀的区别;总结了在评价混凝土抗硫酸杆菌侵蚀性能时使用的各种参数以及提高混凝土抗侵蚀性能的措施.最后认为虽然对混凝土的硫酸杆菌腐蚀的研究取得了一些进展,但是该领域在国内尚属起步研究阶段,在腐蚀程度的评价、预测模型的建立、细菌与母体的关系以及是否可以利用细菌活动来提高混凝土的抗腐蚀能力等方面的研究还很欠缺,建议尽快加强这些方面的研究
关键词:
混凝土
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Concrete
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Corrosion
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Durability
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Advances
Zhenjun ZHOU
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Zhiguo XIAO
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Wei PAN
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Zhipeng XIE
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Xixian LUO
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Lei JIN
材料科学技术（英）
Concrete containing short carbon-coated-nylon fibers (0.4~2.0 vol. pct) exhibited quasi-ductile response by developing a large damage zone prior to fracture localization. In the damage zone, the material was microcracked but continued to local strain-harden. The carbon-coated-nylon-fiber-reinforced concrete composites (NFRC) were found to be an intrinsically smart concrete that could sense elastic and inelastic deformation, as well as fracture. The fibers served to bridge the cracks and the carbon coating gave the conduction path. The signal provided came from the change in electrical resistance, which was reversible for elastic deformation and irreversible for inelastic deformation and fracture. The resistance decrease was due to the reduction of surface touch resistance between fiber and matrix and the crack closure. The resistance irreversible increase resulted from the crack opening and breakage of the carbon coating on nylon fiber.
关键词:
Concrete
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null
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null
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null
Shijin ZHANG
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Zhenfang LIAO
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Changlin YANG
材料科学技术（英）
On the basis of a great number of experiments, it is proved that the strength of concrete is improved greatly when it is mixed with activated water produced by the electro-hydraulic impulse. With the proper parameters, the compression strength of concrete can be increased by 45%. The reason for improvement of concrete strength by using activated water is discussed from the aspect of the structure of molecule.
关键词:
Concrete
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null
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null
Wu YAO
材料科学技术（英）
By heating up the embedded carbon fiber reinforced cement based material (CFRC), the carrying capacity and deformation of concrete member could be adjusted. The relationship between temperature difference and expansion strain of CFRC was demonstrated, and the temperature-deformation-load effect of concrete embedded with CFRC was studied. Heating the CFRC up to different temperatures resulted in different degree of inner pre-stress in concrete. Thus, the load capacity of concrete could be regulated owing to counteracting the pre-stress.
关键词:
Carbon fiber
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null
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null
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null
S.Kesteloot
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C.Djelal
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S.Baraka
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I.Benslimane
材料科学技术（英）
Man-entry sewers sustain many types of structural deterioration, and current repair techniques are very costly. Our objective was therefore to apply methods of localised strengthening by the adhesion of composite plates, as currently used in the construction and public works industry. To do so, it was necessary to run numerical simulations to determine the behaviour and mechanism of the ovoid sewer sections, to ascertain which areas required strengthening. A scale-1 experiment series was carried out to validate the process on reinforced-concrete multicracked ovoid sewers.
关键词:
Sewage systems
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null
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null
