花岗岩石粉对机制砂混凝土基本性能及气体渗透特性的影响
Influence of granite stone powder on the basic properties and gas permeability characteristics of mechanism sand concrete
周翱翔 1张云升 1钱如胜 2苗改霞 1薛翠真 1张宇 1乔宏霞1
作者信息
- 1. 兰州理工大学 土木工程学院,兰州 730050
- 2. 浙江工业大学 建筑工程学院,杭州 310014
- 折叠
摘要
采用花岗岩石粉等质量(0%～32%)替代部分水泥制备机制砂混凝土,应用等温量热、压汞、准稳态气体渗透等方法测试机制砂混凝土的水泥水化热、孔隙结构、力学强度及气体渗透性能,结合灰色关联分析建立不同龄期(28天～130天)石粉-机制砂混凝土气体渗透特性与孔隙特征之间关系.结果表明:机制砂混凝土中掺入适量石粉可减缓水化放热、改善孔隙结构、提高抗压强度及降低气体渗透系数;8%石粉掺量机制砂混凝土的抗压强度最高、气体渗透系数最低,其灰色关联分析表明有效孔隙率和小于 100 nm孔隙对气体渗透性影响最显著.
Abstract
Granite powder(0%-32%)was used to replace part of cement clinker to prepare machine-made sand con-crete.The isothermal calorimetry,mercury intrusion porosimetry as well as gas penetration testing-methods were employed to measure the hydration heat,pore structure,mechanical strength and gas permeability of the concrete.Combined with the gray-correlation analysis method,the relationship between gas permeability properties and pore-structure characteristics was established for concrete at various curing ages(28 days-130 days).The results show that appropriate granite powder added can slow down the hydration heat release rate,refine pore structure,increase compressive strength,and reduce gas permeability.The compressive strength value of the concrete with 8%granite powder is the highest while its gas permeability coefficient reaches the lowest.The gray-correlation analysis shows that the effective porosity and the pore with the size less than 100 nm play the most significant impact on gas permeability.
关键词
花岗岩石粉/机制砂混凝土/孔隙特征/气体渗透性/灰色关联分析Key words
granite powder/machine-made sand concrete/pore-structure/gas permeability/gray correlation analysis引用本文复制引用
基金项目
国家自然科学基金(U21A20150)
浙江省属高校基本科研业务费专项资金(RF-A2023015)
出版年
2024
NETL
NSTL
万方数据