Setting and Strength Characteristics of Alkali-activated Carbonatite Cementitious Materials with Ground Slag Replacement

The effect of the ground granulated blast-furnace slag （ GGBFS ） addition, the modulus n （ mole rutio of SiO2 to Na2O ） and the concentrution of sodium silicate solution on the compressive strength of the material, i e alkuli-activated carbonatite cemeutitious material （ AACCM for short ） was investiguted. In addition, it is found that barium chloride has a sutisfiwtory retarding effect on the setting of AACCM in which more than 20% （ by mass ） ground carbonatite was replaced by GGBFS. As a result, a cementitious material, in which ground carbonatite rock served as dominative starting material, with 3-day and 28-day compressive strength greuter them 30 MPa and 60 MPa and with continuous strength gain beyond 90 days was obtained.

精神发育迟滞（MR）儿童干预效果追踪观察与分析

目的探讨精神发育迟滞（MR）儿童干预效果，为提供最佳的干预对策提供依据。方法采用儿童适应行为评定量表和韦氏儿童智力量表，对66例MR儿童进行干预前、后适应行为商数和智商测试。结果MR儿童适应行为评定量表总得分普遍增高，且随年龄增长而增加，各因子得分训练后比训练前明显增加，尤其是独立功能因子和社会自制因子比较，差异显著P〈0．01。MR儿童的智力发育商数比较，以操作智商比较差异显著，P〈0．01。结论教育和训练对MR儿童社会适应行为、智商水平有促进作用。