Polycarboxylate superplasticizer modified by phosphate ester in side chain and its basic properties in gypsum plaster

Water-reducing agent was one of the most important concrete admixtures. Its main effect is to reduce the unit water consumption of concrete, increase strength, but also help to improve the durability, make it easy-to-mix. Water reducer has gone to polycarboxylate superplasticizer which has single side chain generally. A kind of new water reducer by choosing 2500 and 600 molecular polyethers as the side chains has the higher water-reducing effect than the traditional one. It is more than 26 on fluidity retention in 2 hours.

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Study on adsorption, rheology and hydration behaviours of Polycarboxylate(PCE) superplasticizer synthesized by different acid to ether ratio

Journal of Physics Conference Series ◽

10.1088/1742-6596/2133/1/012007 ◽

2021 ◽

Vol 2133 (1) ◽

pp. 012007

Author(s):

Zhijun Lin ◽

Xiaofang Zhang ◽

Zhanhua Chen ◽

Yue Xiao ◽

Yunhui Fang

Keyword(s):

Molecular Weight ◽

Adsorption Capacity ◽

Cement Paste ◽

Cement Hydration ◽

Main Chain ◽

Chain Structure ◽

Hydration Process ◽

Side Chain ◽

Structure Parameters ◽

Polycarboxylate Superplasticizer

Abstract Polycarboxylate superplasticizer is synthesised by different acid to ether ratio, which is changing the main chain structure parameters, obtained different microstructures. The effect of different microstructure PCE superplasticizer on the fluidity of cement paste, rheological thixotropy, adsorption capacity and hydration heat are studied. The results show that dispersing performance in cement with acid to ether ratio of 3.5 is the best, the molecular weight and side chain density have rather little effect on the cement hydration process.

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Relationship between Structure and Performance of Polycarboxylate Superplasticizer

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.509.57 ◽

2012 ◽

Vol 509 ◽

pp. 57-64

Author(s):

Zi Ming Wang ◽

Zi Chen Lu ◽

Fang Lu ◽

Hui Qun Li

Keyword(s):

Chain Length ◽

Density Functional ◽

Functional Group ◽

Degree Of Polymerization ◽

Side Chain ◽

Side Chain Length ◽

Existing Problems ◽

Polycarboxylate Superplasticizer ◽

And Performance ◽

The Relationship

The structure of the polycarboxylate superplasticizer (PCE) and the relationship between the structure and the performance of PCE were summarized and analyzed. Based on these results achieved so far, the consensus and the unified opinions were presented while the ambiguous and contradictory points were compared and discussed. Furthermore, the different effect on performance caused by different structure such as side chain length, degree of polymerization, side chain density, functional group were discussed systematically. Finally the existing problems and the measures to be taken in the future were proposed

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Effect of Structure of Polycarboxylate Superplasticizer on Hydration of Cement in Early Period

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.487.24 ◽

2012 ◽

Vol 487 ◽

pp. 24-28

Author(s):

Jian Ping Duan ◽

Sheng Hua Lv

Keyword(s):

Cement Paste ◽

Setting Time ◽

Early Period ◽

The Other ◽

Side Chain ◽

Carboxyl Groups ◽

Structure Parameters ◽

Polycarboxylate Superplasticizer ◽

Hydrated Product ◽

Effect Of Structure

Effect of polycarboxylate superplasticizer (PCs) with different bond between side chain and truck chain on hydration of cement in early period was studied. The performance of PCs in concrete was investigated by setting time, TGA and SEM. PC-based superplasticizer with ester bonding between side chain and truck chain. Although they had the proximate structure parameters in density of side chain and absorption group (carboxyl groups), the setting time of cement paste was significantly different when different PCs were employed in the preparation of cement. Decomposing of this bond in alkali environment may lead to a shorter setting time. On the other hand, same difference in hydration production was observed in early period hydration of cement paste when two different PCs was incorporated, which indicated that the different bond structure in PCs affected the hydration of cement in a different manner. The result of SEM indicated that the morphological phase of hydrated product was different when PC was applied, this may be related with the different result in the TG and TGA

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