摘要
研究了不同缓释型减水剂作用下再生砂浆(RCM)的稠度及力学性能,并结合微观形貌及化学官能团特征探讨了不同减水剂对RCM性能影响的作用机理。结果表明,掺0.6%、0.7%、0.8%聚羧酸类减水剂(JSS)RCM的2 h稠度损失率和28 d抗压强度分别为20.2%、17.7%、14.9%和18.8、19.7、20.9 MPa,均优于相同掺量下掺三聚氰胺类和萘系减水剂的RCM。相比于分别含有刚性较大的三嗪、萘环刚性基团的三聚氰胺类和萘系减水剂,主链为脂肪族线链柔性基团,同时接枝嵌段有羧基、磺酸基、羟基等多重亲水官能团的JSS与RCM体系的相容性更佳,RCM中的C-S-H凝胶等水化产物更致密,稳定性更好。
The effects of different types and dosages of slow-release water-reducing agents on the consistencies and mechanical properties of recycled mortars(RCM)were investigated.Then,combining with microstructure and chemical functional groups characteristics,the effect mechanism of different water reducing agents on the properties of recycled premixed mortar was discussed.The results show that,the consistency loss rate after 2 h and 28 d compressive strength of RCM dosing with 0.6%,0.7%,0.8%polycarboxylic acid water reducer(JSS)are 20.2%,17.7%,14.9%and 18.8,19.7,20.9 MPa,respectively,which are all superior to those RCM with melamine and naphthalene-based water reducers.Compared with melamine-based and naphthalene-based water reducers which has rigid triazine and naphthalene ring rigid groups,JSS with aliphatic line chain flexible group main chain,and with multiple hydrophilic functional groups such as carboxyl group,sulfonic group and hydroxyl group grafted on the block has superior compatibility,denser hydration products(C-S-H gels,etc)of RCM,and preferred stability with RCM.
作者
程赟
罗健林
陶李尧
李秋义
罗晓霞
高嵩
张纪刚
马静
CHENG Yun;LUO Jianlin;TAO Liyao;LI Qiuyi;LUO Xiaoxia;GAO Song;ZHANG Jigang;MA Jing(Academy of National Defense Engineering,Academy of Military Sciences,PLA,Beijing 100036,China;School of Civil Engineering,Qingdao University of Technology,Qingdao 266520,China;Nanjing Financial City PhaseⅡProject Department of China Construction Fourth Engineering Bureau,Nanjing 210000,China;School of Architecture Engineering,Qingdao Agricultural University,Qingdao 266109,China;Qingdao Beiyuan Concrete Co.Ltd.,Qingdao 266700,China)
出处
《新型建筑材料》
2021年第6期69-72,87,共5页
New Building Materials
基金
国家自然科学基金项目(51978353,51878366,51878364)
军科国防工程研究院技术服务项目(2019-JKGF-1121)
山东省重大研发计划项目(2019GSF110008)
合肥恒大中心518项目(CSCEC-2017-Z-12)。
关键词
减水剂
再生砂浆
性能
微观形貌
影响机理
water reducers
recycled mortar
physical properties
microstructure
influence mechanism
