生态纤维混凝土的收缩性能试验研究

高性能混凝土低水胶比和掺加矿物掺合料的特点使得混凝土收缩加剧并且引起早期裂缝问题.采用粉煤灰和硅灰作为纤维混凝土的掺合料,通过混凝土配合比的正交试验,利用极差和方差分析,研究了水胶比、砂率、硅灰掺量、生态纤维掺量和粉煤灰掺量对混凝土7,28 d抗压强度的影响.分析了粉煤灰采用超量取代的方法对混凝土的影响.在保证混凝土抗压强度的基础上,优选混凝土配合比,进行混凝土干燥收缩试验.试验结果表明,生态纤维对混凝土强度影响不明显,与矿物掺合料复掺可显著抑制混凝土的干燥收缩.

Experiment study on shrinkage behavior of ecological fiber concrete

The characteristic of low water binder ratio and mineral admixture is the main reason of shrinkage and early age cracked in high-performance concrete. Taking the f,yash and siliceous dust as mixing material of fiber concrete, an orthogonal experiment with different match rations of concre：e was conducted. Studing the water-binder ratio,sand rate,siliceous dust dosage,ecological fiber dosage and flyash dosage on the compressive strength of concrete 7,28 d influence and effect with the method of range and variance analysis. Using super-substitute technique to guarantee the concrete compressive strength basis, optimize concrete proportions and drying shrinkage test. Test results show that compound ecological fiber concrete strength of effect is not obvious,and the mineral admixtures complex admixture can significantly inhibit the drying shrinkage of concrete.