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碳矿化材料是由固碳胶凝材料通过与CO2在常规环境下的碳化反应快速形成以碳酸钙为主要基体组成的复合材料，是实现工业烟气CO2建材化利用的重要技术途径。本工作以γ-C_2S为固碳胶凝材料，研究了Fe掺杂、壳聚糖引入、养护制度设计3种复合增强措施对碳矿化材料力学性能与产物组成的影响规律。结果表明，不同的增强措施并非简单的叠加效应，也存在矛盾关系，其中，可以获得超高强度的组别有：Fe–γ-C_2S+壳聚糖引入的碳矿化材料在养护24 h后抗压强度达到200 MPa以上，壳聚糖引入组可以在延长养护时间后获得更高的强度上限，养护7 d后抗压强度可达约230MPa。Fe–γ-C_2S组的碳酸钙晶型以方解石为主，而长期CO2养护下的γ-C_2S组则为文石相组成。不同的产物组成也是影响强度增长的重要因素，由此提出超高强碳矿化材料的理想结构模型：壳聚糖存在于硅凝胶与碳酸钙之间，连接两相，方解石生长于内部，文石包裹于外部。方解石为碳矿化体养护早期提供强度，文石则在外侧占据了主要的孔隙空间，为后期养护过程中CO2提供扩散通道。
Abstract：CO2 solidified carbonate material is defined as a calcium carbonate-based composite material with a rapid strength obtained via the carbonation reaction of carbonatable binders with CO2 under normal conditions. In this paper, the mechanical properties and product composition of the CO2 solidified carbonate materials with Fe doping, chitosan inducing and curing regime designing were investigated as γ-C2S was used as a carbonatable binder. The results show that the enhancing strategies have a conflicting connection with one another. The Fe–γ-C_2S group with chitosan inducing(i.e., 200 MPa after 24 h curing) and the chitosan induced γ-C_2S group with long curing time(i.e., 230 MPa after 7 d curing) have a high strength. The crystalline form of calcium carbonate in γ-C_2S group is mainly aragonite, while the calcium carbonate in Fe–γ-C_2S group is calcite. The product composition of the CO2 solidified carbonate material is another crucial factor influencing the strength. The CO2 solidified carbonate material with an ultra-high strength has a structural feature, i.e., chitosan connects two phases(silica gel and calcium carbonate), and calcite exists inside in the calcium carbonate layer and aragonite outside. The presence of calcite can provide the strength at early curing stage, while aragonite occupies the main pore space on the outside, providing a diffusion channel for CO2 at the later curing stage.
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基本信息:
DOI：10.14062/j.issn.0454-5648.20230232
中图分类号:TB33
引用信息:
[1]赵思雪,刘志超,王发洲.超高强碳矿化材料的设计与制备[J].硅酸盐学报,2023,51(09):2128-2137.DOI:10.14062/j.issn.0454-5648.20230232.
基金信息:
国家杰出青年科学基金项目(51925205)
2023-05-29
2023-05-29
2023-05-29