Structure-property study of novel star-shaped block polycarboxylate superplasticizers prepared via ATRP in Portland cement

被引：1
|
作者：
Li, Jialin [1 ,2 ,5 ,6 ]
Zhou, Shanshan [1 ,2 ,5 ,6 ]
Pang, Hao [1 ]
Huang, Yuewen [1 ,2 ,3 ,4 ,5 ,6 ]
Wang, Bin [1 ,2 ,3 ,4 ,5 ,6 ]
机构：
[1] Chinese Acad Sci, Guangzhou Inst Chem, Guangzhou 510650, Peoples R China
[2] CAS Engn Lab Special Fine Chem, Guangzhou 510650, Peoples R China
[3] CASH GCC Nanxiong Res Inst Adv Mat Co Ltd, Nanxiong 512400, Peoples R China
[4] CASH GCC Shaoguan Res Inst Adv Mat, Nanxiong 512400, Peoples R China
[5] Guangdong Prov Key Lab Organ Polymer Mat Elect, Guangzhou 510650, Peoples R China
[6] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
MATERIALS TODAY COMMUNICATIONS | 2023年 / 35卷
关键词：
Atom transfer radical polymerization; Cement paste; Superplasticizer; Particle-bubble agglomeration; Hydrophobic interaction; AIR-BUBBLES; EARLY HYDRATION; FLOW BEHAVIOR; COMB-LIKE; ADSORPTION; PCE; MICROSTRUCTURE; PERFORMANCE; POLYMERS; ENTRAINMENT;
D O I：
10.1016/j.mtcomm.2023.106042
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Star-shaped superplasticizers exhibited excellent dispersion performance on cement paste, but the molecular structure remained poorly controlled. This study develops three star-shaped block superplasticizers via atom transfer radical polymerization to investigate their effects on fluidity and early hydration in the Portland cement system. The three star-shaped block superplasticizers with acid to ether monomer ratio of 28, 36 and 100, are marked as SPCE-1, SPCE-2 and SPCE-3 respectively. Fluidity test shows that SPCE-1 and SPCE-3 with higher hydrodynamic radius exhibit better initial fluidizing effect than SPCE-2. Besides, there is competitive adsorption of SPCEs between the clinker phase and nano-ettringite in pore solution. SPCE-1 behaves best in fluidity retention due to the increase of adsorption amount over hydration time. A dispersion mechanism based on the extended-DLVO theory was proposed that SPCEs reduce hydrophobic interaction between cement grains and prevent agglomeration between cement grains and air bubbles.
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页数：12
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