摘要
为了防止因水工混凝土表面劣化以及向内扩展影响工程的使用寿命,提高混凝土的耐久性,必须对混凝土表面进行特殊保护和修复。长江科学院利用超声分散法,在聚天门冬氨酸酯与异氰酸酯合成脂肪族耐老化高分子材料的基础上,添加纳米二氧化硅、有机硅烷偶联剂和活性稀释剂制备出一种新型的纳米二氧化硅/聚脲复合材料———CW系列混凝土表面保护修补材料,并考察了超声分散时间、纳米二氧化硅粒子用量、异氰酸酯的种类和用量等因素对该复合材料性能的影响。研究表明该材料具有环保、高耐候性、高黏结性、干燥和潮湿面均可施工等特性,能有效提高混凝土等结构的抗紫外老化、抗冲磨、抗渗、抗碳化、抗冻融、抗化学侵蚀等耐久性能,且施工简便,可广泛适用于病险水库的除险加固,新建大坝、水库的混凝土表面防护和裂缝修补,乃至水利工程中其它防渗抗老化等领域。目前,该材料已在三峡大坝、丹江口大坝、南水北调中线工程、宜昌汤渡河和尚家河水库等水利工程的除险加固中得到成功应用。
The surface of hydraulic concrete must be protected and repaired to improve its durability.To this end,a new type of CW series concrete surface protection and patching materials,namely nano-silicon dioxide/polyurea composite materials were synthesized by researchers in Yangtze River Scientific Research Institute.The materials were produced through ultrasonic dispersion by adding organosilane coupling agent,reactive diluent and nano-silicon dioxide to the synthcticfat of polymerization of polyaspartic esters and isocyanates.Meanwhile,the effects of ultrasonic dispersion time,the amount of nano-silicon dioxide,and the type and amount of isocyanate on the properties of the composites were explored.It was found that the newly developed materials were environmentally friendly,highly durable and cohesive and could be easily operated under dry and wet conditions,which could effectively improve the properties against ultraviolet aging,abrasion,permeability,carbonization,frost,and chemical corrosion of concrete.In this sense,they can be widely used in danger-eliminating and reinforcing for old hazardous reservoirs,surface protection and crack repairing of new hydraulic constructions,as well as other anti-seepage and anti-aging projects in hydraulic engineering.Up until now,the materials have been applied in the danger-eliminating and reinforcing of Three Gorges Dam,Danjiangkou Dam,the Middle Route Project of the South-to-North Water Diversion Project,Yichang Tangduhe reservoir and Shangjiahe reservoir.
出处
《长江科学院院报》
CSCD
北大核心
2011年第10期175-179,共5页
Journal of Changjiang River Scientific Research Institute
基金
科技部国际科技合作项目(2010DFB70470)
水利部科技推广计划项目(TG1113)
中央级公益性科研院所基本科研业务费专项资金项目(CKSF2011015/CL+SH)
