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关于水工构造用混凝土表面修补磨砂机制和特性方面的研究(中文3700字,英文2400字)
摘要：本文研究内容包括丙烯酸溶液砂浆、二氧化硅砂浆、高强度砂浆、聚丙烯纤维（PP）砂浆及玄武岩纤维砂浆（BF）等化合物并对其压缩弯曲式裂张粘合强度、抗磨损性及SEM微结构作了进一步分析。研究结果显示，添加丙烯酸溶液至砂浆会显著降低砂浆压缩弯曲强度，但所有其它类型的修补磨砂则显示出卓越的机械性能。与空白试样相比，修补材料的粘合强度得到了显著的增强。与那些没有使用粘合剂的样品相比，丙烯酸乳化浆可显著改善粘合性能。添加纤维对提高砂浆抗磨损性有着极为深远的影响。与空白试样相比，聚丙烯纤维砂浆磨损率降低了46.7%，而抗磨损性则提高了58.2%。为期28天的乳化分析显示，丙烯酸乳化浆中出现了许多胶合状水化产品，而在二氧化硅乳化剂中则出现了大量的杆状钙矾石结晶和纤维状CSH凝胶剂。添加PP纤维和BF至修补砂浆并未改变水化类型。
关键词：水工构造用混凝土；修补砂浆；机制分析；特性
外文资料
STUDY ON THE MECHANISMS AND PROPERTIES OF REPAIR MORTAR FOR HYDRAULIC CONCRETE SURFACE
Abstract The acrylic emulsion mortar, silica mortar, high strength mortar, polypropylene(PP) fiber mortar and basalt fiber(BF) mortar were compounded and their compressive, flexural, split-tensile bond strength, abrasion resistance performance and microstructure analysis of SEM were studied. The result show that addition of acrylic emulsion into mortar obviously reduced the compressive and flexural strength of mortar but all other kinds repair mortar present excellent mechanical properties. Compared with the blank sample, the bond strength of repair materials has significantly enhanced. The binder of acrylic emulsion paste could improve remarkably bond property compared with the sample without binder. Addition of fibers had a meaningful effect in increasing abrasion resistance of mortar. Compared with the blank sample, wear ratio of PP fiber mortar decreased 46.7% and abrasion resistance strength increased 58.2% respectively. SEM analysis of 28 day paste show that emerge lots of glued shape hydrated products in acrylic emulsion paste and a large number of rod ettringite crystal and fiber shape CSH gels filled in silica paste. The addition of PP fiber and BF into repair mortar did not change the type of hydrates.
Key words hydraulic concrete; repair mortars; mechanism analysis; properties
