PDF全文阅读

孟文慧，宋少民

（北京建筑大学 建筑结构与环境修复功能材料北京市重点实验室，北京 100044）

摘 要：以矿渣、粉煤灰、钢渣、铁尾矿微粉、熟石灰、脱硫石膏等为原材料研究无熟料胶凝材料的制备及其胶砂、混凝土性能。结果表明：无熟料胶凝材料标准稠度用水量在28.5%到30.5%之间，初凝时间均大于150 min，终凝时间在200~460 min之间；不掺加水泥的无熟料胶凝材料，早期钢渣含量较高的通用胶砂抗压强度较高，其专用胶砂抗压强度也较高且56 d时可达50 MPa；掺入不超过胶凝材料5%的P•Ⅰ型硅酸盐水泥的无熟料胶凝材料，钢渣含量较低、石膏含量较高的通用和专用胶砂抗压强度都相对较高，较优组别专用胶砂抗压强度28 d可达35 MPa，56 d达到45 MPa；选用胶砂强度较优的胶凝材料配比进行混凝土试验，无熟料胶凝材料混凝土工作性良好，28 d抗压强度满足C20~C25混凝土强度要求，56 d满足C25~C30混凝土强度要求。

关键词：无熟料胶凝材料；胶砂；混凝土；工作性；强度

中图分类号：TU528  

文献标志码：A   

文章编号：1005-8249（2024）01-0032-07

DOI：10.19860/j.cnki.issn1005-8249.2024.01.007

 

MENG Wenhui, SONG Shaomin

(Beijing University of Civil Engineering and Architecture, Beijing Key Laboratory of Building Structure and Environmental Remediation Functional Materials, Beijing 100044, China)

Abstract: Slag, fly ash, steel slag, iron tailings powder, slaked lime, desulfurization gypsum, etc.，are applied as raw materials to study the preparation of non clinker cementitious materials and the properties of mortar and concrete. The experimental results indicate that the standard consistency water consumption of non clinker cementitious materials is between 28.5% and 30.5%, and the initial setting time is greater than 150 min, while the final setting time ranges from 200 min to 460 min; The type I non clinker cementitious material without adding cement is used. The general mortar with high steel slag content has a higher early compressive strength, and its special mortar also has a higher compressive strength that can reach 50 MPa at 56 d; P • I type Portland cement with no more than 5% cementitious materials is a Class II non clinker cementitious material. The compressive strength of general and specialized cementitious sand with low steel slag content and high gypsum content is relatively high. The compressive strength of the superior group's special mortar can reach 35 MPa after 28 d and 45 MPa after 56 d; The concrete test was conducted using a cementitious material ratio with better mortar strength. The concrete without clinker cementitious material showed good workability, and the compressive strength at 28 d met the strength requirements of C20-C25 concrete, while the compressive strength at 56 days met the strength requirements of C25-C30 concrete.

Keywords: clinker-free cementitious materials; mortar; concrete; workability; strength

作者简介：孟文慧(1997-),女,本科,主要研究方向：建筑材料。

通信作者：宋少民(1965-),男,硕士，教授,主要研究方向：现代混凝土材料。

收稿日期：2023-08-24