Novel designs of polycarboxylate superplasticizers for improving resistance in clay-contaminated concrete

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

“…Xu et al (2018) synthesized quaternary PCEs grafted with β-cyclodextrin by copolymerizing the monovinyl β-cyclodextrin monomer, sodium methylallyl sulfonate, acrylic acid and methyl allyl polyoxyethylene ether (TPEG) via free-radical polymerization initiated by hydrogen peroxide solution to improve the performance of a kaolin clay. Liu et al (2017) used star-shaped PCE synthesized by acrylic acidmethyl allyl polyoxyethylene ether (AA-TPEG) copolymer arms on a polyol(pentaerythritol) core to minimize the detrimental effects of clays in cement. These methods are mainly based on increasing the size of PCE.…”

Effect of the Synthesis Temperature of Polycarboxylate-Based Superplasticizer on the Performance of Concrete

“…After finished the determination of initial concrete slump, the mixtures were placed under condition of air temperature for 30 min and tested the concrete slump immediately (Figure 3) Table 3, no change was observed in slump and compressive strength of the concrete values which is used PCEs synthesized at different temperatures. In most studies, radical polymerization of PCEs was carried out under 30-80 °C [2][3][4][5][6][7][8][9]. Quantity of heat is needed during the polymerization reaction.…”

“…The PEO side chains excite a steric hindrance effect between the cement particles suspended in water [ 6]. Although the effect of PCEs on concrete has been investigated in some studies [7,8], effect of the synthesize temperature of PCEs on concrete performance is very limited [9].…”

Investigation of the Behavior and Mechanism of Action of Ether-Based Polycarboxylate Superplasticizers Adsorption on Large Bibulous Stone Powder

“…In all of different types of clay, montmorillonite shows the most deleterious influence on the adsorption of PCE onto cement particles as compared with kaolinite, feldspar and mica. As such, Lei et al, Chen et al, Liu et al, and Li et al, have designed and synthesized several novel polymer structures to prevent physisorption and chemisorption onto montmorillonite, such as modifying the side chain structure, replacing it with short side chains, designing star-shaped PCE and using a zwitterionic functional group [ 11 , 12 , 13 , 14 , 15 ]. Moreover, a general trend was observed from Werani et al that a copolymer of poly(methacrylic acid) (PMAA) and methoxy polyethylene glycols (MPEG) macromonomer with a shorter n EO of 10 could provide better anti-clay dispersing ability in the cement paste contained 1% (by weight of cement) of montmorillonite [ 16 ].…”