摘要
应用纳米压痕技术对水泥净浆以及掺磨细矿渣的水泥浆体中各个区域的弹性模量、硬度等微观力学性能进行了测试和计算,同时,利用Gaussian函数对弹性模量、硬度的频率分布曲线进行了多峰拟合,获得水化产物中毛细孔、高密度C-S-H凝胶、低密度C-S-H凝胶以及氧氧化钙相关参数的统计分布。结果表明:水泥净浆中高密度C-S-H凝胶硬度及弹性模量随着水化龄期的延长而提高,体积含量增大;磨细矿渣的掺入能使水化后期浆体中C-S-H的硬度和弹性模量出现一定幅度的增大;当磨细矿渣掺量达到50%时,频率分布拟合曲线中没有氢氧化钙峰出现,说明大量磨细矿渣的二次水化消耗了浆体中大部分氢氧化钙。
Micro-mechanical properties of cement paste and paste with ground slag were examined by a nanoindentation technique. The elastic modulus and hardness of indentated places were calculated and mapped in two dimension surface.A multi-peak regressive fitting was carried out in the frequency plots of the tested parameters based on the Gaussian function.The statistical distribution of the micro-mechanical properties（such as the capillary pores,low density C-S-H,high density C-S-H and portlandite） was summarized for the hydrates in cementitious paste.The results show that the hardness,elastic modulus,and the volume fraction of high density C-S-H in cement paste increase with the curing age.The hardness and elastic modulus of C-S-H in late age paste might increase when ground slag was added.Little calcium hydroxide peak appeared in the fitting curves of frequency plots at the mixing amount of slag of 50%,indicating that the secondary hydration of slag consumed the most of portlandite in the paste.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2011年第4期718-725,共8页
Journal of The Chinese Ceramic Society
基金
国家重点基础研究发展计划(2009CB623200)资助项目
关键词
纳米压痕技术
矿渣
水泥基材料
微观力学性能
nanoindentation technique
slag
cementitious material
micro mechanical properties
