Damping cementitious materials have been widely used in engineering structures for vibration control. However, achieving a balance between the mechanical strength and damping capacity of cementitious materials remains a challenge. Herein, we utilized an initiator (APS) to initiate the self-crosslinking reaction of PVA molecules in CS paste, then successfully introduced the viscoelastic PVA membranes into C-S-H gel to enhance its energy dissipation capacity. Results showed that the self-crosslinking PVA (scPVA) increased the loss modulus () of C-S-H gel by about 158 %, increased loss tangent () by 85 % and increased the compressive strength by 24 %. Nano-microscopic tests and molecular dynamics (MD) simulation confirmed that scPVA was introduced into C-S-H gel via the hydrogen-bonding interaction, and then formed the viscoelastic PVA membranes, which promoted CS hydration, reduced the pore size of C-S-H gel and increased the mean chain length (MCL) of C-S-H gel. This study proposes a novel approach for designing high-damping cementitious materials.

中文翻译：

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通过聚（乙烯醇）自交联增强CSH凝胶的能量耗散能力


阻尼胶凝材料已广泛应用于工程结构的振动控制。然而，实现水泥材料的机械强度和阻尼能力之间的平衡仍然是一个挑战。在此，我们利用引发剂（APS）引发CS糊剂中PVA分子的自交联反应，然后成功地将粘弹性PVA膜引入CSH凝胶中以增强其能量耗散能力。结果表明，自交联 PVA (scPVA) 使 CSH 凝胶的损耗模量 ( ) 增加约 158 %，损耗角正切 ( ) 增加 85 %，压缩强度增加 24 %。纳米显微测试和分子动力学（MD）模拟证实，scPVA通过氢键作用引入CSH凝胶中，形成粘弹性PVA膜，促进CS水化，减小CSH凝胶的孔径，提高平均孔径。 CSH 凝胶的链长 (MCL)。这项研究提出了一种设计高阻尼水泥材料的新方法。