摘要
稻壳灰(RHA)是稻壳控制燃烧产生的高活性火山灰材料,广泛用作生产高性能混凝土的矿物掺合料。稻壳灰的加入对水泥水化有着复杂的影响,目前的模型并不能解释所有这些复杂的影响。通过考虑稻壳灰对复合胶凝体系的稀释效应、化学效应、稻壳灰多孔结构对于水的吸收和释放等因素,建立了RHA-水泥胶凝体系的水化动力学模型,并以水灰比、环境温度,RHA颗粒细度和掺量等为变化参数,通过模型计算与试验结果相比较,证明所建立的模型可较好地模拟含RHA-水泥胶凝体系的水化进程,可用于预测RHA-水泥胶凝体系的水化程度随龄期的变化规律。结果表明,RHA-水泥胶凝体系的水化程度与水灰比、环境温度和比表面积是成正比的关系。研究可为稻壳灰在水泥中的应用提供依据,同时达到提高水泥的经济性和节约资源的目的。
Rice husk ash(RHA)is a highly active pozzolanic material produced by the controlled combustion of rice husks,which is widely used as a mineral admixture for the production of high performance concrete.The addition of rice husk ash has a complex effect on cement hydration.Current models do not account for all these complex effects.In this paper,by considering factors such as the dilution and chemical effect of rice husk ash on the composite cementing system,as well as the absorption and release of water by the porous structure of rice husk ash,a hydration kinetic model of RHA cement cementitious system is established.Taking water cement ratio,ambient temperature,RHA particle fineness and dosage as variable parameters,the model calculation is compared with the experimental results.It is proved that the model can simulate the hydration process of cement cementitious system with RHA and can be used to predict the hydration degree of cement cementitious system with age.The results show that the degree of hydration of the RHA-cement cementing system is directly proportional to the water-cement ratio,ambient temperature and specific surface area.The research can provide a basis for the application of rice husk ash in cement,and at the same time achieve the purpose of improving the economy of cement and saving resources.
作者
吴浪
吴小萍
黄斯蕙铭
沈健
WU Lang;WU Xiaoping;HUANG Sihuiming;SHEN Jian(School of Civil Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013,China)
出处
《功能材料》
CAS
CSCD
北大核心
2022年第5期5178-5185,共8页
Journal of Functional Materials
基金
国家自然科学基金项目(51468022)。
关键词
稻壳灰
水化动力学
胶凝体系
rice husk ash
cementitious system
hydration kinetics
