Synthesis and Performance of Shrinkage-reducing PolycarboxylateSuperplasticizer

FANG Xu-shun; XU Xiao-ping; CHEN Guo-xin; ZHU Ye-ran; HUANG Guo-hong

doi:10.11988/ckyyb.20150601

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Journal of Changjiang River Scientific Research Institute ›› 2015, Vol. 32 ›› Issue (12) : 134-138. DOI: 10.11988/ckyyb.20150601

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Synthesis and Performance of Shrinkage-reducing PolycarboxylateSuperplasticizer

FANG Xu-shun¹,XU Xiao-ping³,CHEN Guo-xin^1,2,ZHU Ye-ran^1,2,HUANG Guo-hong^1,2

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Abstract

To solve the durability of structures caused by shrinkage and crack of concrete,we prepared an shrinkage-reducing polycarboxylate superplasticizer(PS) with high water-reducing rate and good cementitious compatibility.Firstly,an ester macromonomer was prepared by using acrylic acid,neopentyl glycol and water-carrying agent in association with polymerization inhibitor and catalyzer.Then,the shrinkage-reducing PS of TX-938 was synthesized by using the ester monomer,isoamyl alcohol polyoxyethylene ether,acrylic acid and dipropylene glycol with the combined effect of the oxidation-reduction initiator and chain-transferring agent.The performance that we tested shows that,as for cement dispersion property and adaptability,the shrinkage-reducing PS of TX-938 is almost equal to TX-50H,which is a kind of normal PS;moreover,TX-938 can significantly decrease the surface tension from 72.3 mN/m(without TX-938 ) to 31.6 mN/m with the blending ratio of 2.5%;then,the drying shrinkage of mortar blended with TX-50H and TX-938 decreases by 10.5% and 29.1% respectively when compared with that of mortar without PS;72 hours after initial set ,the drying shrinkage of concrete is 452×10^-6 and 399×10^-6 respectively,in other words,the drying shrinkage of concrete with TX-938 was only 88% of that of concrete with TX-50H,and the 28d drying shrinkage of concrete with TX-938 is only 35.6% of that of concrete without PS,less than 50% of that of concrete with TX-50H;finally,the water-reducing rate of TX-938 is up to 29.4% and TX-938 has no negative effect on compressive strength of concrete at different ages.

Key words

shrinkage-reducing type / polycarboxylate / superplasticizer / synthesis / strength of concrete / shrinkage of concrete

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FANG Xu-shun,XU Xiao-ping,CHEN Guo-xin,ZHU Ye-ran,HUANG Guo-hong. Synthesis and Performance of Shrinkage-reducing PolycarboxylateSuperplasticizer[J]. Journal of Changjiang River Scientific Research Institute. 2015, 32(12): 134-138 https://doi.org/10.11988/ckyyb.20150601

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