To better assess the safety of cementitious materials containing crushed waste oyster shells (WOS), the workability, mechanical properties (compressive strength and static elastic modulus) and durability (volume of permeable void (VPV), water absorption (WA) and total charge passed) were studied. The effects of replacing river sand with different content of crushed WOS (0, 10, 20 and 30%) on flowability, mechanical properties and durability of mortar have been revealed. The results indicated that the addition of WOS had a significant effect on the flow table of the mortar, and the loss ratio of FT varied from 25% to 39% at 120 min. Although the compressive strength (f_c), static elastic modulus (E_c) and apparent density gradually decreased with the increase of WOS content, the mechanical properties were improved by prolonging the curing time. The incorporation of crushed WOS in mortar increased the VPV and WA, as well as the transport properties of mortar. The replacement of natural river sand with crushed WOS greatly increased the drying shrinkage of mortar. The substituted ratio–Gardner model exhibited the best accuracy in predicting the drying shrinkage development of crushed WOS mortar.

中文翻译：

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含碎废牡蛎壳砂浆的力学和耐久性指标

为了更好地评估含有碎牡蛎壳 (WOS) 的胶凝材料的安全性、可加工性、机械性能（抗压强度和静弹性模量）和耐久性（渗透空隙体积 (VPV)、吸水率 (WA) 和通过的总电荷） ) 进行了研究。揭示了用不同含量的碎WOS（0、10、20和30%）替代河砂对砂浆流动性、力学性能和耐久性的影响。结果表明，WOS的加入对砂浆的流动表有显着影响，120 min时FT的损失率为25%~39%。虽然抗压强度（_fc ）、静弹性模量_（Ec)，表观密度随着WOS含量的增加而逐渐降低，机械性能随着固化时间的延长而提高。在砂浆中加入粉碎的WOS增加了VPV和WA，以及砂浆的传输性能。用粉碎的WOS代替天然河砂大大增加了砂浆的干燥收缩率。替代比率-Gardner 模型在预测 WOS 砂浆的干缩发展方面表现出最好的准确性。