摘要
在普通硅酸盐水泥P.O 42.5的基础上,采用掺杂量为0,0.03%,0.05%和0.07%(质量分数)的氧化石墨烯作为基体的增强相,制备了氧化石墨烯改性混凝土。测试了改性混凝土试样的孔隙率、力学性能、碳化性能和磨损性能,并对各指标的相关性进行了分析。结果表明,适量氧化石墨烯的掺杂促进了改性混凝土的水化反应,对水泥水化产物的结晶组成没有影响,且使水化产物尺寸得到细化,生成了更加规则的结晶化合物;随着氧化石墨烯掺杂量的升高,改性混凝土的孔隙率、碳化深度和磨损量均呈现出先降低后升高的趋势,而抗压强度和抗折强度表现出先升高后降低的趋势;当氧化石墨烯的掺杂量为0.05%(质量分数)时,孔隙率最低为27.53%,7和28 d的碳化深度均为最低值1.46和3.81 mm,磨损量为最低值1.24 kg/m^(2),28 d的抗拉强度和抗折强度均为最大值53.9和6.7 MPa。可知,当氧化石墨烯的掺杂量为0.05%(质量分数)时,改性混凝土的综合性能最佳。
On the basis of ordinary Portland cement P.O 42.5,graphene oxide modified concrete was prepared by using graphene oxide doped with 0,0.03wt%,0.05wt%and 0.07wt%as the reinforcing phase of the matrix.The porosity,mechanical properties,carbonation and wear properties of modified concrete samples were tested,and the correlation of each index was analyzed.The results showed that an appropriate amount of graphene oxide doping promoted the hydration reaction of modified concrete,had on effect on the crystalline composition of cement hydration products,refined the size of hydration products and formed more regular crystalline compounds.With the increase of graphene oxide doping,the porosity,carbonation depth and wear of modified concrete showed a trend of first decreasing and then increasing,while the compressive strength and flexural strength showed a trend of first increasing and then decreasing.When the doping amount of graphene oxide was 0.05 wt%,the minimum porosity was 27.53%,the carbonization depth at 7 and 28 d was the minimum value of 1.46 and 3.81 mm,the wear amount was the minimum value of 1.24 kg/m^(2),and the tensile strength and flexural strength at 28 d were the maximum values of 53.9 and 6.7 MPa.It can be seen that when the doping amount of graphene oxide is 0.05 wt%,the comprehensive performance of modified concrete is the best.
作者
何晓航
韩俊艳
HE Xiaohang;HAN Junyan(Luohe Institute of Technology, Henan University of Technology, Luohe 462000, China;Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology, Beijing 100124, China)
出处
《功能材料》
CAS
CSCD
北大核心
2022年第7期7169-7174,共6页
Journal of Functional Materials
基金
国家青年科学基金项目(51808018)。
关键词
氧化石墨烯
混凝土
力学性能
碳化性能
磨损性能
graphene oxide
concrete
mechanical properties
carbonization properties
wear properties
