Details

Autor(en) / Beteiligte

• Ren Jun, Ren Jun
• Luo Shuqiong, Luo Shuqiong
• Shi, Shi
• Tan Hongbo, Tan Hongbo
• Wang Xianfeng, Wang Xianfeng
• Liu Min, Liu Min
• Li Xiangguo, Li Xiangguo

Titel

Synthesis and optimization of a montmorillonite-tolerant zwitterionic polycarboxylate superplasticizer via Box-Behnken design

Ist Teil von

• Clay minerals, 2021-06, Vol.56 (2), p.117-125

Ort / Verlag

Middlesex: Mineralogical Society

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Polycarboxylate superplasticizer (PCE) is sensitive to the clay present in concrete aggregates. In particular, Montmorillonite (Mnt), an impurity inevitably contained in the aggregate, can significantly influence the performance of concrete. In an effort to improve the compatibility of PCE, a zwitterionic PCE with cationic amide groups and shorter side-chain lengths was synthesized via free radical copolymerization. The optimal synthesis condition was verified via Box-Behnken design. In addition to characterizing the PCE, the performance of PCE in cement pastes with or without Na-Mnt was examined and the underlying mechanism was explored. The results show that, compared with commercially available PCE, the required dosage of PCE for cements containing Na-Mnt decreased. Unlike commercially available PCE, no intercalation occurred on the newly manufactured clay-tolerant PCE within the layers of Mnt, resulting in a greater sorption thickness and improved dispersion of the cements containing Na-Mnt.