A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Synthesis and Properties of an EPEG Slump Retaining Polycarboxylic Acid Superplasticizer
In order to meet the special requirements for long-term slump retention of concrete under extreme conditions such as long distance transportation and super high-rise pumping construction, an EPEG slump retaining polycarboxylic acid superplasticizer (LT-PCE) was prepared by free radical aqueous solution polymerization at room temperature, which used ethylene glycol monovinyl polyoxyethylene ether (EPEG-2400), acrylic acid (AA), hydroxypropyl acrylate (HPA) as comonomers, β-mercaptoethanol as chain transfer agent, hydrogen peroxide and binary complexes of ferrous sulfate/formaldehyde sodium bisulfate as oxidation-reduction system. The molecular structure and mechanical properties of LT-PCE and commercial high performance EPEG polycarboxylic acid slump retaining agent (CA-PCE) were compared and analyzed. The results showed that LT-PCE was a polymer containing a variety of functional groups, and its molecular chain was dominated by ether macromonomers and supplemented by ester macromonomers. Compared with CA-PCE, LT-PCE has significantly higher conversion rate and more uniform molecular chain distribution, which can significantly improve the dispersion retention performance and mechanical strength of concrete.
Synthesis and Properties of an EPEG Slump Retaining Polycarboxylic Acid Superplasticizer
In order to meet the special requirements for long-term slump retention of concrete under extreme conditions such as long distance transportation and super high-rise pumping construction, an EPEG slump retaining polycarboxylic acid superplasticizer (LT-PCE) was prepared by free radical aqueous solution polymerization at room temperature, which used ethylene glycol monovinyl polyoxyethylene ether (EPEG-2400), acrylic acid (AA), hydroxypropyl acrylate (HPA) as comonomers, β-mercaptoethanol as chain transfer agent, hydrogen peroxide and binary complexes of ferrous sulfate/formaldehyde sodium bisulfate as oxidation-reduction system. The molecular structure and mechanical properties of LT-PCE and commercial high performance EPEG polycarboxylic acid slump retaining agent (CA-PCE) were compared and analyzed. The results showed that LT-PCE was a polymer containing a variety of functional groups, and its molecular chain was dominated by ether macromonomers and supplemented by ester macromonomers. Compared with CA-PCE, LT-PCE has significantly higher conversion rate and more uniform molecular chain distribution, which can significantly improve the dispersion retention performance and mechanical strength of concrete.
Synthesis and Properties of an EPEG Slump Retaining Polycarboxylic Acid Superplasticizer
Advances in Engineering res
Zhang, Yu (editor) / Li, Dayong (editor) / Zhang, Yukun (editor) / Luan, Yalin (editor) / Zhao, Qian (author) / Meng, Xiang-Jie (author)
International Conference on Architectural, Civil and Hydraulic Engineering ; 2024 ; Shenyang, China
2025-03-01
6 pages
Article/Chapter (Book)
Electronic Resource
English
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