Qi Beimeng
College of Quality & Safety Engineering, China Jiliang University, Hangzhou 310018, China.
Materials (Basel). 2022 Mar 4;15(5):1912. doi: 10.3390/ma15051912.
Sludge water (SW) with abundant sulfate ions (SO) was utilized in this work to replace freshwater (FW) to prepare green high performance concrete (GHPC). A comprehensive investigation was conducted to evaluate the early-age performance of GHPC specimen mixed with SW incorporation (GHPC-SW). High temperature steam curing (HTS) has been presented to prepare GHPC-SW specimens. The compressive strength of the GHPC-SW specimen cured by HTS curing for 2 days is 85.2 MPa, which is 34% higher than the compressive strength of the GHPC-SW specimen cured by 3 days standard curing as the reference. The mechanical property results reveal that the incorporation of SW makes no harmful effects on the strength formation of HPC specimens, compared with FW added specimens under the same curing methods. Moreover, XRD and TG analyses indicate that HTS curing can effectively improve the hydration degree of GHPC-SW specimens. MIP analysis has been conducted and the specimens cured by HTS curing exhibit a more refined pore structure with fewer harmful pores. This work lays a solid foundation for the utilization of SW in the concrete construction industry, which is resource saving and environmentally friendly.
本研究利用富含硫酸根离子（SO）的污泥水（SW）替代淡水（FW）来制备绿色高性能混凝土（GHPC）。开展了一项全面调查，以评估掺入SW的GHPC试件（GHPC-SW）的早期性能。已采用高温蒸汽养护（HTS）来制备GHPC-SW试件。经HTS养护2天的GHPC-SW试件的抗压强度为85.2 MPa，比作为参照的经3天标准养护的GHPC-SW试件的抗压强度高34%。力学性能结果表明，与相同养护方法下添加FW的试件相比，掺入SW对高性能混凝土试件的强度形成没有有害影响。此外，XRD和TG分析表明，HTS养护可有效提高GHPC-SW试件的水化程度。已进行MIP分析，经HTS养护的试件呈现出更细化的孔结构，有害孔更少。这项工作为污泥水在混凝土建筑行业中的利用奠定了坚实基础，既节约资源又环保。
