廢輪胎的處理是目前世界上急需面對的環境問題；若能將其回收再利用於水泥製品中，不但能改良混凝土之性質，亦能達到環境保護及資源回收再利用之功效。橡膠混凝土為混凝土與橡膠材料結合而成之複合材料，但橡膠與水泥材料各自為疏水性及親水性材料，混合應用時常會發生許多界面上的問題，導致其使用性能降低。有鑑於此，本研究分別使用聚丙烯醯胺（PAM）及聚乙烯醇（PVA）兩種高分子改質劑，改質橡膠表面，藉由改質劑中高分子親水基來改質橡膠表面成親水性，進而提升複合材料之界面性能。研究中，巨觀方面透過改質橡膠表面接觸角試驗、水泥砂漿流度試驗、水泥漿體初終凝試驗、抗壓強度試驗、抗彎強度試驗及耐侵蝕試驗等檢驗物理及機械性質性能；微觀方面則應用傅利葉紅外光譜分析儀(FT-IR)、光學顯微鏡(OM)及掃描式電子顯微鏡(SEM)，來探討材料界面結合機制及材料機械性能之相關性。研究結果顯示，水泥混凝土添加橡膠可增加強其工作性，且橡膠用PAM及PVA改質後可提高其表面親水性能，以助橡膠表面水泥之水化，並促進與水泥材料之良好結合，進而提升混凝土的機械強度及抗蝕性能。改質後較改質前之橡膠混凝土約可增加14%~20%之抗壓強度、18%~27%之抗彎強度及增加1~5個耐侵蝕循環；微觀性質分析方面，藉由FT-IR、OM及SEM，可量測表面微觀結構之變化及橡膠表面之水泥水化情形以闡明其作用機理。

The waste tires can be added to concrete to form a composite material, known as “Rubcrete”. However, addition of rubber crumbs leads to degradation in the physical properties of the concrete. In this study, by treating the tire crumbs with Polyacrylamide (PAM) and Polyvinylalcohol (PVA), we have improved the properties of the rubberized mortar, “Rubcrete”. Specifically, the compressive and flexural strengths of the specimen at 56 days were improved up to 14~20% and 18~27%, respectively. The anti-corrosion property of this new rubberized mortar was dramatically superior to that of the original mortar, and the test cycles were increased from 1 to 5 in the anti-corrosion test. The addition of rubber also turned the crack from fragility crack to ductility crack. To examine the impacts of PAM and PVA modification on the microscopic level, the specimens with and without PAM and PVA modification, were observed with SEM. Experimental results showed that PAM and PVA treatment of rubber crumbs is an effective means to improve the mechanical properties of the rubberized mortar and lends itself to possible commercial applications.

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