以再生骨料作为碱活性物质的大掺量矿渣粉混凝土：工作性、温度历程与强度

Mass GGBFS Concrete Mixed with Recycled Aggregates as Alkali-Active Substances: Workability, Temperature History and Strength.

作者信息

Huo Yanlin, Huang Jinguang, Han Xiaoyu, Sun Huayang, Liu Tianan, Zhou Jingya, Yang Yingzi

机构信息

School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China.

Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, China.

出版信息

Materials (Basel). 2023 Aug 15;16(16):5632. doi: 10.3390/ma16165632.

DOI:10.3390/ma16165632

PMID:37629923

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10456633/

Abstract

This study provides the results of an experiment on the possibility of using high-volume ground granulated blast furnace slag (HVGGBFS)-based concrete as mass concrete. In addition to the control concrete, the total weight of the binder was 75% ground granulated blast furnace slag (GGBFS) and 25% ordinary Portland cement (OPC). For the aggregates, both natural and recycled aggregates were used. Three specimens with dimensions of 800 mm × 800 mm × 800 mm were prepared to simulate mass concrete. The workability, temperature aging and strength of the mass concrete were tested. The test results showed that utilizing HVGGBFS concrete as mass concrete can significantly reduce the heat of hydration due to the low heat of hydration of GGBFS, while the heat of hydration of GGBFS and recycled aggregate combination is 11.2% higher than normal concrete, with a slump that is 31.3% lower than that of plain concrete. The results also showed that the use of recycled aggregates in HVGGBFS concrete can significantly reduce workability. However, the compressive strength is higher than when natural aggregates are used due to the alkali activation effect caused by the recycled aggregates. The compressive strength at 7 and 28 days increased by 33.7% and 16.3%, respectively.

摘要

本研究给出了一项关于使用基于高掺量磨细粒化高炉矿渣（HVGGBFS）的混凝土作为大体积混凝土可能性的实验结果。除了对照混凝土外，胶凝材料的总重量为75%的磨细粒化高炉矿渣（GGBFS）和25%的普通硅酸盐水泥（OPC）。对于骨料，天然骨料和再生骨料均有使用。制备了三个尺寸为800mm×800mm×800mm的试件来模拟大体积混凝土。对大体积混凝土的工作性、温度时效和强度进行了测试。测试结果表明，由于GGBFS的水化热较低，使用HVGGBFS混凝土作为大体积混凝土可显著降低水化热，而GGBFS与再生骨料组合的水化热比普通混凝土高11.2%，坍落度比素混凝土低31.3%。结果还表明，在HVGGBFS混凝土中使用再生骨料会显著降低工作性。然而，由于再生骨料引起的碱激活效应，其抗压强度高于使用天然骨料时的抗压强度。7天和28天的抗压强度分别提高了33.7%和16.3%。