多孔混凝土的强度特性

同普通混凝土一样，强度是多孔混凝土硬化后的主要力学性质，进行多孔混凝土基层路面结构设计、材料组成设计以及施工质量检测时，均需采用各种强度指标进行评价。多孔混凝土属于骨架空隙结构，其强度取决于内部起胶结作用的水泥石性质、集料特性及浆集比等。试验结果表明：多孔混凝土抗压强度早期增长较快，符合线性关系，后期强度发展较慢，符合对数关系；长龄期劈裂强度与28d劈裂强度之间符合对数关系；42．5级水泥多孔混凝土与32．5级水泥多孔混凝土的抗压强度之间存在良好的线性相关性。此外，多孔混凝土弯拉强度与抗压强度及劈裂强度与抗压强度之间均存在相关性良好的幂指数关系，并据此得出相应的对应关系表，便于工程实际应用。

Strength character of porous concrete

Like popular concrete, strength is the main mechanical character of porous concrete, and various strength targets are used when carrying out the structure design of pavement with porous concrete base, material mix ratio design and construction quality detection. Porous concrete belongs to framework-pore structure, and the strength lies on the characters of cement stone, aggregate and binder aggregate ratio etc. It is drawn that early compression strength of porous concrete increases more quickly and accords with liner relationship, while the later strength increases more slowly and accords with logarithmic relationship. Split strength between long-age and 28 d age accords with logarithmic relationship, and compression strength of porous concrete with 42.5 cement and 32.5 cement accords with good liner relationship. The good exponential relationships between flexural tensile strength and compression strength, split strength and compression strength are got. Based on this, the corresponding relationship table is deduced, which can be used in practical projects. 11 tabs, 10 figs, 8 refs.