Abstract

The aim of this study is to explore the influence of HEMC with different total substitution degrees and polyacrylamide (PAAm) modification on the properties of steel slag cement mortar. The results show that HEMC increases the water retention rate, consistency, tensile bond strength, and flexibility of all types of steel slag cement mortars. The addition of HEMC, however, leads to a decrease in compressive strength and flexural strength. The total substitution degree or PAAm modification of HEMC has a minor effect on the water retention rate, compressive strength, flexibility, and pore size distribution of steel slag cement mortar. HEMC with a higher total substitution degree is more beneficial to the development of tensile bond strength except for SL1 cement mortar at an early age (3 days and 7 days), whereas PAAm weakens the positive effect of HEMC on the tensile bond strength. Mercury intrusion porosimeter (MIP) tests show that the addition of HEMC increases the porosity of steel slag cement mortar.

摘要

本研究旨在探讨不同总取代度的HEMC和聚丙烯酰胺(PAAm)改性对钢渣水泥砂浆性能的影响。结果表明，HEMC 提高了所有类型钢渣水泥砂浆的保水率、稠度、拉伸粘结强度和柔韧性。然而，添加 HEMC 会导致抗压强度和抗弯强度降低。HEMC的总取代度或PAAm改性对钢渣水泥砂浆的保水率、抗压强度、柔韧性和孔径分布影响较小。总取代度越高的 HEMC 越有利于拉伸粘结强度的发展，除 SL1 水泥砂浆在早期（3 天和 7 天），而 PAAm 削弱了 HEMC 对拉伸粘合强度的积极影响。压汞仪（MIP）测试表明，HEMC的加入增加了钢渣水泥砂浆的孔隙率。