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Experimental study on deformation capacity and strength characteristics of polyurea and
polyurea mortar for seam sealing and seepage control in hydraulic structures

1 1 1 1 2
MENG Tianyi ，LIU Xiaonan ，LI Bingqi ，MONDAL Arghya Uthpal ，YANG Xin

（1. China Institute of Water Resources and Hydropower Research，Beijing 100038，China；

2. Inspection and Certification CO.，TD. MCC，Beijing 100088，China）

Abstract：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 sili‐
ceous 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 condi‐
tions. The comparative analysis of the test group′s overall performance indicated that the elongation at break sur‐
passed 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. Conse‐

quently，polyurea mortar is inappropriate for sealing seams in hydraulic structures，as it fails to endure water pressure.

Keywords：two-component fast reaction polyurea；two-component slow reaction polyurea；one-component poly‐

urea；polyurea mortar；tensile test

（责任编辑：韩 昆）
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