| 孟天一,刘小楠,李炳奇,MONDAL Arghya Uthpal,杨鑫.水工建筑物封缝防渗结构中聚脲和聚脲砂浆变形能力和强度特性的试验研究[J].水利学报,2025,56(11):1492-1503 |
| 水工建筑物封缝防渗结构中聚脲和聚脲砂浆变形能力和强度特性的试验研究 |
| Experimental study on deformation capacity and strength characteristics of polyurea and polyurea mortar for seam sealing and seepage control in hydraulic structures |
| 投稿时间：2024-12-02 修订日期：2025-11-14 |
| DOI：10.13243/j.cnki.slxb.20240779 |
| 中文关键词: 双组分快反应聚脲 双组分慢反应聚脲 单组分聚脲 聚脲砂浆 拉伸试验 |
| 英文关键词: two-component fast reaction polyurea two-component slow reaction polyurea one-component polyurea polyurea mortar tensile test |
| 基金项目:中国水科院科研专项（SS0145B492019） |
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| 中文摘要: |
| 一种单组分聚脲与玻璃砂进行充分搅拌形成的混合物被称为聚脲砂浆。目前，在水工建筑物封缝防渗结构中，已有采用聚脲砂浆作为嵌填物进行封缝防渗，但尚无针对聚脲砂浆的试验研究。本研究为解决目前H型试件存在与实际应用相比变形过小问题，提出新型圆柱型试件，并确定圆柱型、H型试件在拉伸试验中的适用范围。在此基础上开展了不同玻璃砂粒径及配比条件下的聚脲砂浆变形能力和强度特性试验，并与对比试验组进行了物理性能试验指标、受力变形行为和破坏模式对比，对比试验组包括单组分聚脲、双组分慢反应聚脲和双组分快反应聚脲。研究结果表明，新型圆柱型试件拉伸效果优于传统H型试件，拉伸试验结果更符合实际情况。对比试验组整体性能优异，聚脲断裂伸长率均大于30%，拉伸破坏强度均大于2.5 MPa，各项物理性能指标均适用于水工建筑物封缝防渗结构，可发挥防渗作用。然而，聚脲砂浆各项物理性能指标较低，断裂伸长率均低于5%，拉伸破坏强度均低于0.6 MPa，无法适应水工建筑物封缝防渗结构承受水压、变形的特点。 |
| 英文摘要: |
| A mixture formed by thoroughly stirring a one-component polyurea with siliceous sand is called polyurea mortar. At present，polyurea mortar serves as an embedding medium for sealing and seepage control in hydraulic structures；however，experimental research on polyurea mortar is insufficient，and the current H-type specimens and their practical applications are limited. A novel type of cylindrical specimens was developed，and the applicable ranges of cylindrical and H-shaped specimens for tensile testing were established. Subsequently，experiments were conducted to investigate the deformation capacity and strength properties of polyurethane mortar under varying siliceous particle sizes and mix ratios. These results were compared with those of a control group，which consisted of single-component polyurethane，dual-component slow-reacting polyurethane，and dual-component fast-reacting polyurethane. The findings indicated that the cylindrical specimens exhibited superior tensile performance compared to the conventional H-shaped specimens，with the tensile test outcomes more accurately reflecting practical conditions. The comparative analysis of the test group's overall performance indicated that the elongation at break surpassed 30%，while the tensile strength exceeded 2.5 MPa. These physical performance indicators are suitable for application in hydraulic structures，for seam sealing and seepage control. In contrast，the polyurea mortar exhibited inferior performance，with an elongation at break of less than 5% and a tensile strength of less than 0.6 MPa. Consequently，polyurea mortar is inappropriate for sealing seams in hydraulic structures，as it fails to endure water pressure. |
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