Performance of polycarboxylate superplasticizer(PCE Sps) synthesized by different polyether monomers.
Polyester type pce synthesized from AA-MPEG ester and MAA-MPEG ester, its mother liquor with good slump retention, and medium water reduction (more than 25%) performance, MAA short for methacrylic acid, have better slump retaining than AA-acrylic acid, but lower water reduction rate than AA, higher sensible to material changes.
PCE synthesized from APEG polyether performance excellent Fluidity in the cement slurry experiment, but the flow reaches the maximum and then quikly stops, followed by bleeding; Concrete performance of the material sensitivity is significant, with the large slump loss and bleeding. In order to improve such issues, many concrete chemical admixture plant compounding APEG polyether PCE with MAA-MPEG esters PCE at that time.
TPEG polyether, also known as IPEG, that is C5 polyether, its molecular weight in 2400 ~ 3300, the original state of 60% solution or tablets after frozen solidified slices. Due to contains bimethyl, so the PCE air content is higher than C4 ,Excessive mixing in concrete affects the strength increase.
HPEG polyether , also known as IPEG, that is C4 polyether, 2 years after the emergence of TPEG, Significant improvement in price/performance over AA-MPEG ester PCEs, can be called a new generation. it can be made into high water reducing type or plasticizing type with lowly slump loss depending on the acid-ether ratio.However, the problem of non-adaptations due to high mud impurities and sensible to material changes are more obvious.
VPEG polyether is also called C6 polyether. Its Endcap by Vinyl phenylene glycol ether, vinyl diethylene glycol ether, vinyl butylene glycol ether, etc., The form is alkaline powder with molecular weight of 3000. Synthesized acid ratio of 3.5~3.8. Advantage is that its products in the concrete show medium water reduction, excellent plasticity and water retention, good overall performance, can make the concrete small viscosity, good fluidity, low sensitivity to changes in the material. The disadvantage is that higher cost than Carbon 4, and there are very few compounding components that can be adapted to it.
