CAJ | 학술논문

采用 Hummers 法及超声破碎分散法制备了氧化石墨烯(GO)纳米相分散液,研究了 GO 对水泥净浆流动度和水泥石微观结构的影响,用 FT-IR、AFM、XRD 及 SEM 对 GO 及水泥石结构进行了表征.结果表明 GO 的掺入降低了净浆流动性,每增加0．01％的 GO 需要增加0．02％的聚羧酸系减水剂(PCs)以保持水泥净浆流动度在3 h 内在200 mm 以上,GO 的掺入能够使水泥石的微观结构发生明显的变化,当 GO/PCs 掺量为0．01％/0．24％~0．03％/0．28％时,水化龄期7 d 的水泥石出现了大量分散均匀的花状微晶体,当 GO/PCs 掺量为0．05％/0．32％~0．07％/0．36％时,同龄期水泥石中出现大量的片状晶体,在水化龄期延长到28 d 时有转化为密实结构的趋势,结果说明 GO 具有调控水泥水化产物形貌的能力及增强增韧的作用,此研究结果对于提高水泥基材料的力学性能具有重要意义.
채용 Hummers 법급초성파쇄분산법제비료양화석묵희(GO)납미상분산액,연구료 GO 대수니정장류동도화수니석미관결구적영향,용 FT-IR、AFM、XRD 급 SEM 대 GO 급수니석결구진행료표정.결과표명 GO 적참입강저료정장류동성,매증가0．01％적 GO 수요증가0．02％적취최산계감수제(PCs)이보지수니정장류동도재3 h 내재200 mm 이상,GO 적참입능구사수니석적미관결구발생명현적변화,당 GO/PCs 참량위0．01％/0．24％~0．03％/0．28％시,수화령기7 d 적수니석출현료대량분산균균적화상미정체,당 GO/PCs 참량위0．05％/0．32％~0．07％/0．36％시,동령기수니석중출현대량적편상정체,재수화령기연장도28 d 시유전화위밀실결구적추세,결과설명 GO 구유조공수니수화산물형모적능력급증강증인적작용,차연구결과대우제고수니기재료적역학성능구유중요의의.
Graphene oxide (GO)nanophase dispersion was prepared by Hummers method followed ultrasonica-tion.The effects of GO on fluidity of cement pastes and microstructure of hardened cement paste were studied. The microstructure of GO and hardened cement paste were characterized by FT-IR,AFM,XRD and SEM.The tested results showed that the fluidity of cement paste with GO would reduce.And the study also found a 0.01%increase in the dosage of GO should increase 0.02% of polycarboxylate superplasticizer (PCs)in order to keep the fluidity more than 200 mm within 3 h.Meanwhile,the results also showed that the microstructure of hard-ened cement hydrate have changed obviously with the addition of GO.When GO/PCs dosage was 0.01%/0.24%-0.03%/0.28%,there are lots of flower-like micro-crystals with distribution evenly in the hardened ce-ment paste at hydration age of 7 d.When GO/PCs dosage was 0.05%/0.32%-0.07%/0.36%,there are many la-mellae shaped crystals in the hardened cement paste at 7 d.And the hardened cement paste showed dense trend with hydration age extended to 28 d.The results suggested that GO can ragulate the microstructure of cement hydration products and have excellent reinforcing and toughening effects,which has a significance for the im-provement of the strength and toughness of cement based composites.