Effect of nonionic side chain length of polycarboxylate-ethe卜based high-range water-reducing admixture on properties of cementitious systems  

作　　者：Sileyman OZEN Muhammet Gokhan ALTUN Ali MARDANI-AGHABAGLOU Kambiz RAMYAR 

机构地区：[1]Deparment of Civil Engineering,Faculty of Enginering and Natural Sciences,Bursa Technical Universin,Yildirim Bursa 16330,Turkey [2]Deparment of Civil Engineering,Faculty of Engineering,Bursa Uludag University,Nilufer.Bursa 16059,Turkey [3]Department of Civil Engineering,Faculty of Engineering,Ege University,Bornova-lzmir 35040,Turkey

出　　处：《Frontiers of Structural and Civil Engineering》2020年第6期1573-1582,共10页结构与土木工程前沿（英文版）

基　　金：The authors express their sincere gratitude to the Scientific and Technological Research Council of Turkey(Grant No.219M425);Bursa Uludag University Science and Technology Center(Grant Nos.AYP(MH)-2016/16,DDP(MH)-2018/9,and DDP(MH)-2019/15).The first author thanks TUBITAK for the scholarship provided by Grant No.217M408 during his PhD study.The authors would like to acknowledge Polisan Construction Chemicals Company and Bursa Ready Mixed Concrete for the provision of the materials and information on their properties.

摘　　要：Despite the large variations in the behaviors of water-reducing admixtures upon changes in their structures,most previous reports on the cement-admixture compatibility did not provide suficient information on the structure of the admixture.Hence,the evaluation and generalization of the reports on the cement-admixture compatibility are challenging.In this study,three different polycarboxylate-ether-based water-reducing admixtures with the same free nonionic content,anionic/nonionic molar ratio,and main chain length and different side chain lengths were produced.The compatibility of these admixtures with a CEM I 42.5R-type cement was investigated.In addition,an analysis of variance was performed on the experiment results to evaluate the contributions of the admixture type,admixture/cement ratio,and elapsing time to the Marsh funnel flow time,mini-slump,slump flow,and compressive strength.The water-reducing admixtures having long or short side chains reduced the initial flow characteristics of the cementitious systems.However,the admixture having the shortest side chain was better with regard to flow retention.The side chain length of the admixture did not have significant effects on the compressive strength and water absorption capacity of the mortar mixtures and mini-slump performances of the cement paste mixtures.Regarding the behaviors of the admixtures in the cementitious systems,an optimal admixture side chain molecular weight is proposed.

关 键 词：water-reducing admixture side chain length cement paste FLUIDITY compressive strength 

分 类 号：TU525[建筑科学—建筑技术科学]