| 吕生华,孙立,张佳,胡浩岩,雷颖,侯永刚.具有大规模规整致密花状微观结构形貌高/超高性能氧化石墨烯/水泥基复合材料[J].材料导报,2017,31(23):78-84 |
| 具有大规模规整致密花状微观结构形貌高/超高性能氧化石墨烯/水泥基复合材料 |
| High/Ultra-high Performance Graphene Oxide/Cement-based Composites with Large-scale, Ordered and Compact Flower-like Microstructures |
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| DOI：10.11896/j.issn.1005-023X.2017.023.010 |
| 中文关键词: 高性能混凝土 氧化石墨烯 水化产物 微观结构 |
| 英文关键词: high-performance concete, graphene oxide, hydration products, microstructure |
| 基金项目:陕西省科技统筹资源引导项目(2016KTCL01-14)； 国家自然科学基金面上项目(21276152) 吕生华:1963年生,博士,教授,博士研究生导师,主要研究方向为氧化石墨烯的制备及应用,水泥基材料的结构与性能 E-mail: lvsh@sust.edu.cn |
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| 中文摘要: |
| 通过掺入氧化石墨烯(GO)及调控水灰比制备了高性能及超高性能水泥基复合材料,当水灰比为0.26及GO掺量为0.03%和0.05%时,水泥基复合材料的抗压强度和抗折强度分别为125.6 MPa、146.7 MPa和15.6 MPa、18.3 MPa。当水灰比为0.18及GO掺量为0.03%和0.05%时,水泥基复合材料的抗压强度和抗折强度分别为168.6 MPa、181.3 MPa和26.9 MPa、29.4 MPa。水泥基复合材料的抗渗透、抗冻融、抗碳化等性能得到了显著提高。通过SEM 观察水泥基体的微观形貌,发现水泥水化产物成为了形状规整的水化晶体,并且交织交联成为规整致密的花状微观形貌。XRD结果表明,规整形状水化晶体是由多种水泥水化晶体复合杂化形成的复合晶体。 |
| 英文摘要: |
| The high-and ultra-high-performance cement composites (HPC and UHPC) were prepared by doping graphene oxide (GO) and varying water-cement ratio. When water-cement ratio is 0.26 and GO dosage is 0.03% and 0.05%, the compressive and flexural strength of HPC were 125.6 MPa, 146.7 MPa and 15.6 MPa, 18.3 MPa, respectively. And while water-cement ratio is 0.18 and with 0.03% and 0.05% GO, the compressive and flexural strength were 168.6 MPa, 181.3 MPa and 26.9 MPa and 29.4 MPa, respectively. The penetration resistance, freeze-thaw resistance and carbonation resistance of the cement composites got remarkably improved by properly adding GO. The regular-shaped crystals of cement hydration products which gathered to form ordered and compact microstructures were observed in SEM microscopic morphology. XRD results indicated that the regular-shaped hydration crystals were constructed by complexing and hybridizing.of cement hydration crystals. |
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