船闸混凝土抗裂性能试验研究及开裂风险评估

针对船闸大体积混凝土容易发生开裂的问题，通过室内试验研究不同配合比混凝土的热力学及变形性能，并基于多场耦合模型对廊道结构混凝土进行开裂风险评估计算。研究结果表明：掺入抗裂剂减小混凝土干燥收缩且自生体积变形初期产生较大膨胀，显著提升混凝土体积稳定性和抗裂性能；抗裂剂可降低船闸廊道结构混凝土最大开裂风险系数40%以上，控制廊道混凝土各部位开裂风险在0.7以下，大大降低了结构混凝土开裂风险。

Crack resistance and cracking risk assessment of ship lock concrete

Regarding the cracking problem of mass concrete of ship lock, the thermodynamic and deformation properties of concrete with different mix ratios are studied by laboratory tests. Based on multi-field coupling model, cracking risk calculation of corridor structure concrete has been carried out. The research results show that the addition of anti-cracking agent reduces the drying shrinkage and produces large expansion at the initial stage of autogenous volume deformation, which significantly improves the volume stability and anti-cracking performance of concrete. The anti-cracking agent can reduce the maximum cracking risk coefficient of the ship lock corridor structure concrete by more than 40%, and make the cracking risk of the corridor concrete below 0. 7, which greatly reduces the risk of structural concrete cracking.