全组分废弃混凝土再生水泥熟料烧成及水化性能研究

针对我国废弃混凝土胶凝化再生利用技术存在的组分分离导致材料利用率低、生产成本和能耗高等问题,提出利用以石灰岩为粗骨料的全组分废弃混凝土作为生料原料,煅烧熟料、制备再生水泥的新思路.研究了再生水泥的生料易烧性以及熟料的矿物组成、水化强度和水化产物的微观形貌.结果表明:全组分废弃混凝土再生水泥技术是可行的;再生水泥生料易烧性较好,熟料胶砂强度低于硅酸盐水泥熟料技术要求,试验条件是影响强度的主要因素;引入熟料晶种煅烧的再生水泥熟料,其主要矿物成分和水化产物的组成与参比工业熟料基本相同,两者水化产物中C-S-H凝胶形貌相似.

Study of sintering process and hydration of recycled cement clinker produced from all components of waste concrete

A new method is proposed to rapidly get sinusoidal voltage effective value based on IIR low-pass filter comparing full-cycle sampling method, derivative method and iterative method in charging system for the Vehicle to Grid. Firstly, the mean-square of voltage is calculated to get AC signal with DC component. Then, the AC component of the mean-square voltage is filtered using IIR low-pass filter and get the half of the mean-square of maximum voltage, which is the square of voltage effective value, and then the voltage effective value is obtained. This algorithm can get filtered DC component without high-frequency components, only needs one sample of voltage to get voltage effective value rapidly as well as conveniently and has strong anti-jamming capability comparing to the other three methods previously mentioned. The Vehicle to Grid charging system model is established in Matlab / Simulink, and the desired voltage effective value is achieved using the new algorithm.