戴圣,徐菲,李飞,等. 复掺聚合物改性水下不分散浆液的性能研究[J]. 水利水运工程学报.. doi: 10.12170/20230727002
引用本文: 戴圣,徐菲,李飞,等. 复掺聚合物改性水下不分散浆液的性能研究[J]. 水利水运工程学报.. doi: 10.12170/20230727002
(DAI Sheng, XU Fei, LI Fei, et al. Investigation into the characteristics of anti-washout underwater slurry modified by blending polyacrylate and polyacrylamide[J]. Hydro-Science and Engineering(in Chinese)). doi: 10.12170/20230727002
Citation: (DAI Sheng, XU Fei, LI Fei, et al. Investigation into the characteristics of anti-washout underwater slurry modified by blending polyacrylate and polyacrylamide[J]. Hydro-Science and Engineering(in Chinese)). doi: 10.12170/20230727002

复掺聚合物改性水下不分散浆液的性能研究

Investigation into the characteristics of anti-washout underwater slurry modified by blending polyacrylate and polyacrylamide

  • 摘要: 针对掺入聚丙烯酰胺(PAM)水泥浆液在水工建筑物水下修补时存在的施工性差、水陆强度比偏低的问题,采用外掺占水泥质量5%~25%聚丙烯酸酯乳液(PAE),通过截锥圆模、贯入阻力法、称重法测取水泥流失量和浊度仪测试悬浊物含量测定改性水泥基材料施工性能,研究水陆成型养护条件下PAE和PAM混合改性水泥浆液在3、7和28 d时的力学性能,并以扫描电镜(SEM)分析PAE对掺PAM的水泥浆液的微观改性机理。结果表明,PAE的掺入可明显改善浆体流动性,延长凝结时间,但对水下抗分散性能有所削弱;可显著提高水泥浆体的抗折和粘结强度,但会导致抗压强度有所降低;产生聚合物与水泥形成互穿网络结构、膜填充孔隙区域并与钙矾石(AFt)等水化产物的缠绕包裹,提升了其力学性能,且陆上成型的养护膜结构更加致密。

     

    Abstract: Addressing challenges related to the poor constructability and low water-to-land strength ratio of polyacrylamide (PAM) cement in underwater repair of hydraulic structures, this study introduces polyacrylate emulsion (PAE) at concentrations ranging from 5% to 25% of the cement mass. The research aims to evaluate the construction performance of modified cement-based materials using truncated cone circular molds, the penetration resistance method, cement loss measurement by weighing, and suspended matter content testing by turbidimeter. Mechanical properties of PAE-modified PAM cement were assessed at 3, 7, and 28 days under both water and land forming curing conditions. Additionally, the microscopic modification mechanism of PAE on PAM cement was analyzed using a scanning electron microscope (SEM). Results indicate that the incorporation of PAE enhances slurry fluidity and extends setting time, albeit at the expense of underwater anti-washout performance. It significantly improves flexural resistance and bonding strength but results in a decrease in compressive strength. The polymer and cement form an interpenetrating network structure, with the membrane filling the pore area and wrapping around hydration products like ettringite (AFt). These factors contribute to better mechanical properties, and the structure of the curing film formed on land is denser.

     

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