摘要
从资源利用和物料平衡的观点看,稻壳最适宜的出路是制备用作混凝土掺合料的纳米SiO2。实验表明,将稻壳控制在600℃焚烧,所得的低温稻壳灰(LowTemperatureRiceHuskAsh,L-RHA)由纳米尺度的SiO2粒子(～50nm)疏松地粘聚而成。稻壳灰结构中除了微米尺度的蜂窝孔外,还含有大量由SiO2粒子非紧密粘聚而形成的纳米尺度孔隙(<50nm)。活性试验显示,低温稻壳灰火山灰活性超过造粒硅灰,对普通混凝土和高强混凝土都具有强烈的增强作用。当低温稻壳灰替代水泥量为10%～20%时,可提高高强混凝土抗压强度10mPa以上。
From the views of resources exploita tion and material balance,the most s uitable utilization of rice husk is to make nano SiO 2 used as mineral admixture of concrete.Experiments showed that low temperature rice husk ash burned at 600℃(L -RHA)consisted of nano SiO 2 particles(～50nm)sticking slackly each other.Besides micron -cellular pores,there are m any nano interstitial pores(<50nm)formed by the packing of nano SiO 2 particles.The activity test indica ted that the pozzolanic activity of L -RHA surpassed that of pelletized silica fume,and L -RHA has strong strengthen effect on ordinary concrete and high strength concrete.When the replacement of cement by L -RHA equaled 10%～20%,the increase of compressive strength of HSC exceeded 10mPa.
出处
《粮油食品科技》
2003年第4期41-43,共3页
Science and Technology of Cereals,Oils and Foods
