飞机拦阻系统用超轻质混凝土组成设计研究  

Mix Proportion Design of Ultra-lightweight Concrete for Engineered Material Arresting System

作　　者：方俊 王振地 王玲 FANG Jun;WANG Zhen-di;WANG Ling(State Key Laboratory of Green Building Materials,China Building Materials Academy,Beijing 100024,China)

机构地区：[1]中国建筑材料科学研究总院有限公司绿色建筑材料国家重点实验室,北京100024

出　　处：《混凝土与水泥制品》2020年第8期12-17,共6页China Concrete and Cement Products

基　　金：国家重点研发计划项目(2017YFB0309903)。

摘　　要：为保持飞机拦阻系统用超轻质混凝土溃缩强度的长期稳定,设计了“P·I水泥+惰性掺合料”胶凝材料体系,基于超轻质混凝土的干密度及溃缩强度的变化规律,确定了关键制备参数的适宜取值范围,研究了超轻质混凝土的孔结构特征。结果表明,“P·I水泥+重质碳酸钙”体系下超轻质混凝土在60 d后溃缩强度基本保持稳定,重质碳酸钙掺量为63.0%~64.3%时,超轻质混凝土60~150 d溃缩强度变化率为0.93%~7.08%,压溃曲线平台段应力偏差为±4.98%~±9.70%。发泡剂和稳泡剂的推荐掺量分别为4.4%、5.0%,稳泡剂能优化超轻质混凝土孔径分布。适宜水胶比为0.54~0.56,提高水胶比可能增加气孔的数量。In order to control the long-term stability of crushing strength of ultra-lightweight concrete used in Engineered Material Arresting System(EMAS),the cementing material system of"P·I cement+inert additive"was designed.Based on the dry density and crushing strength of ultra-lightweight concrete,the appropriate values of inert additive and other key preparation parameters were determined,and the pore structure characteristics of ultra-lightweight concrete was also studied.The results show that under the"P·I cement+heavy calcium carbonate"system,the crushing strength of ultra-lightweight concrete remains basically stable after 60 d.When the dosage of heavy calcium carbonate is 63.0%~64.3%,the change rate of crushing strength from 60 d to 150 d is 0.93%~7.08%,and the stress deviation of the platform segment is±4.98%~±9.70%.The recommended dosage of foaming agent and foam stabilizer is 4.4%and 5.0%respectively.Foam stabilizer can optimize the pore size distribution of ultra-lightweight concrete.The suitable water-binder ratio is 0.54~0.56.And the increase of water-binder ratio can enlarge the number of pores.

关 键 词：飞机拦阻系统 超轻质混凝土 溃缩强度 干密度 惰性掺合料 

分 类 号：TU528[建筑科学—建筑技术科学]