活性粉末混凝土不同龄期的力学性能研究

Study on mechanical properties of reactive powder concrete at different ages

为研究活性粉末混凝土(Reactive Powder Concrete,RPC)常温养护下不同龄期力学性能,基于最紧密堆积原理设计C100、C120、C1403种强度的RPC配合比,通过标准方法,测得其抗压强度和轴压强度,在此基础上分析强度指标随龄期的变化规律.试验结果表明:RPC棱柱体破坏表现为自上而下的劈裂成片形态.RPC抗压强度和轴压强度随着龄期的增长总体上呈增大趋势,C140强度配比下,早期抗压强度发展缓慢,轴压强度则表现为早期(7~28 d)和后期(56~128 d)发展缓慢,中期(28~56 d)提升较快.RPC轴压强度与抗压强度表现为较强的线性关系,与龄期则表现为对数关系,其拟合曲线与试验结果吻合良好.常温养护下,随着龄期的增长,RPC强度持续的增长趋势明显,有较好的工程应用前景.

To study the mechanical properties of reactive powder concrete(RPC)at different ages under normal temperature curing,the RPC mix ratio of C100,C120 and C140 was designed based on the most compact packing principle,and the compressive strength and axial compressive strength were measured by the standard method.The results indicated that the RPC prism was split into pieces from top to bottom.RPC compressive strength and axial compressive strength generally increased with curing age.Under the C140 strength ratio,the compressive strength developed slowly in the early stage,while the axial compressive strength developed slowly in the early(7~28 d)and late stages(56~128 d),but increased rapidly in the middle stage(28~56 d).RPC axial compressive strength shows a strong linear relationship with compressive strength,and a logarithmic relationship with curing age.The fitting curves were in good agreement with the experimental results.Under normal temperature curing,RPC strength has an obvious trend of continuous growth with the curing age,and possesses good engineering application prospects.