| 摘要: |
为了提高贝壳废弃物的消纳量，实现资源循环利用，以贻贝粗骨料替代天然粗骨料，制备了贻贝粗骨料取代率为15%、30%、45%、60%、100%的贻贝粗骨料混凝土，并研究了其宏微观性能.结果表明：贻贝粗骨料中具有较高含量的无机钙，但作为天然粗骨料的替代材料，由于吸水率为2.4%、表观密度为2 402 kg/m3![]() ![]() 、压碎指标为68.2%，均超出规范要求，贻贝粗骨料物理性能弱于天然粗骨料；随着贻贝粗骨料取代率的提高，贻贝粗骨料混凝土的力学性能降低；贻贝粗骨料与砂浆界面过渡区的缺陷区域是混凝土性能劣化的主要原因；配合比设计得出，当贻贝粗骨料取代率为30%时，可以制备强度等级为C30的贻贝粗骨料混凝土. |
| 关键词: 贻贝 混凝土 力学性能 微观形貌 显微硬度 |
| DOI：10.3969/j.issn.1007-9629.2022.11.008 |
| 分类号:TU528.09 |
| 基金项目:浙江省“高层次人才特殊支持计划”科技创新领军人才项目（2021R52035） |
|
| Macroscopic and Microscopic Properties of Mussel Coarse Aggregate Concrete |
|
ZHONG He, ZHAO Yuxi, MENG Tao
|
|
College of Civil Engineering and Architecture， Zhejiang University， Hangzhou 310058， China
|
| Abstract: |
In order to increase the consumption of shellfish waste and realize the recycling of resources， the mussel coarse aggregate was used to replace the natural coarse aggregate. The mussel coarse aggregate concrete with the substitution rate of 15%， 30%， 45%， 60% and 100% was prepared， and its macro and micro properties were studied. The results show that the mussel coarse aggregate has a high content of inorganic calcium， but as a substitute for natural coarse aggregate， the physical properties of mussel coarse aggregate are weaker than that of natural coarse aggregate because the water absorption is 2.4%， the apparent density is 2 402 kg/m3![]() ![]() ， and the crushing index is 68.2%， which exceeds the requirements of the specification.With the increase of the replacement rate of mussel coarse aggregate， the mechanical properties of mussel coarse aggregate concrete decrease. The main reason for the deterioration of concrete performance is the defect area in the interface transition zone between mussel coarse aggregate and mortar. The mix design shows that when the replacement rate of mussel coarse aggregate is 30%， the mussel coarse aggregate concrete with C30 strength can be prepared. |
| Key words: mussel concrete mechanical property microscopic morphology microhardness |
