材料单调退化原理下的颗粒料骨架抗冻性试验研究

Experimental Research on Frost Resistance of Granular Material Framework Under the Principle of Monotonic Material Degradation

研究依托雄安新区荣乌高速项目,开展高性能纤维混凝土的抗冻试验研究,定量分析不同水胶比和矿物掺合料掺量对抗冻质量损失和相对动弹性模量等表征参数的影响,并借助Wiener函数对混凝土的抗冻性进行可靠度评价。结果表明,在抗冻性中,随着冻融循环次数的增加,抗冻质量损失率和相对动弹性模量损失率逐渐升高;水胶比的增大使其抗冻质量损失率和相对动弹性模量损失逐渐变大,而矿物掺合料掺量的增大会使其抗冻质量损失率和相对动弹性模量损失逐渐变小;借助Wiener随机过程的退化理论分析,在抗冻质量损失中,水胶比与抗冻性成反比,矿物掺合料掺量与抗冻性成正比。上述研究成果对荣乌高速的装配式梁板体系混凝土应用提供了科学的理论支撑和技术指导。

Based on the Rong-Wu Expressway project in Xiong’an New Area,the frost resistance test of high-performance fiber concrete was carried out,the effects of different water-glue ratios and mineral admixture dosages on the anti-freezing mass loss and relative dynamic elastic modulus were quantitatively analyzed,and the reliability of the concrete was evaluated by the Wiener function.The results show that:In the frost resistance,with the increase of the number of freeze-thaw cycles,the anti-freeze mass loss rate and the relative dynamic elastic modulus loss rate gradually increase.In the frost resistance,the increase of the water-glue ratio makes the frost resistance mass loss rate and relative dynamic elastic modulus loss gradually increase,while the increase of mineral admixture content will make its frost resistance mass loss rate and relative dynamic elastic modulus loss gradually smaller.With the help of the degradation theory analysis of Wiener’s random process,in the loss of frost resistance,the ratio of water glue is inversely proportional to frost resistance,and the amount of mineral admixture is directly proportional to frost resistance.The above research results provide scientific theoretical support and technical guidance for the concrete application of prefabricated beam and plate system of Rong-Wu Expressway.