复掺白云石粉与粉煤灰混凝土力学性能试验研究

为研究复掺白云石粉与粉煤灰对高性能混凝土力学性能的影响,系统开展了白云石粉取代水泥/粉煤灰用量的混凝土抗压强度、弹性模量以及干燥收缩等力学性能试验。基于比力学性能指标法,分析了白云石粉取代量对比抗压强度、比弹性模量以及比干燥收缩量及其对应的性能贡献率的影响。研究表明:(1)同一养护龄期下,混凝土比抗压强度与强度贡献率随着白云石粉取代水泥用量的增大呈现逐渐降低的趋势,随着白云石粉取代粉煤灰用量的增大呈现逐渐增大的趋势;(2)混凝土比弹性模量与弹性模量贡献率随着白云石粉取代水泥用量的增大呈现先增加后降低趋势,随着白云石粉取代粉煤灰用量的增大呈现先降低后增加趋势;(3)混凝土比干燥收缩量随着白云石粉取代水泥/粉煤灰用量的增加均呈现逐渐降低的趋势,且对干燥收缩贡献率一般小于零,可见白云石粉能够有效缓解混凝土干燥收缩。

Research on knowledge management contribution rate measurement for real estate enterprises

Based on the improved method of Solow's residual value,through the introduction of potential analysis method,a measurement model of enterprise knowledge management contribution rate(KMCR) is put forward in this paper,and is estimated by the performance measure of a real estate enterprise for implementing knowledge management(KM),then the results have shown that the model and the method have good feasibility.