稻壳灰在超高性能混凝土中的研究应用进展

Progress of Research on the Application of Rice Husk Ash in Ultra-high Performance Concrete

稻壳灰(Rice Husk Ash,RHA)是通过低温控制焚烧稻壳得到的一种具有高火山灰活性和巨大比表面积的火山灰质掺合料。相关研究表明,RHA由于其微观结构的纳米尺度SiO2胶凝粒子和大量纳米尺度的孔隙而获得高火山灰活性和大比表面积。将RHA替代硅灰(SF)应用于超高性能混凝土中,由于RHA的微填充效应,超细微孔结构及孔隙水的内养护作用,可改善混凝土的孔结构,获得高强度和高耐久性和低收缩性。因此,将稻壳灰作为一种绿色资源应用于超高性能混凝土中,在使混凝土获得超高性能的同时,可有效降低成本和充分利用资源,具有广阔的应用前景。

Rice Husk Ash （RHA） is a kind of highly pozzolanic supplementary cementious material with very high specific surface area,which is due to a large amount of nano SiO2 particles and nano pores in the microstructure. It is obtained after complete combustion of rice husk in controlled condi- tions. Ultra-high performance concrete with RHA instead of silica fume can achieve very high strength, high durability and low shrinkage. This is mainly attributed to the filler effect, porous struc-ture and internal water curing of RHA. So the application of RHA in Ultra-high performance concrete is a promising way to reduce of construction cost and increase the effective use of waste resources.