高掺量矿渣水泥与普硅水泥的水化进程对比研究

Comparative Study of Slurry Hydration Process on High Volume Content Slag Cement and Ordinary Portland Cement

针对高掺量矿渣水泥与普硅水泥不同龄期时强度及水化机理的差异,测试分析了普硅水泥浆体(编号PC)和掺60%矿渣粉的水泥浆体(编号SC)各龄期强度及强度发展系数,并对比了两组试样早期水化放热速率,各龄期水化产物相及孔结构的变化。结果表明:SC试样3 d、7 d强度仅为25.6 MPa、39.5 MPa,分别低于同龄期PC试样13.3MPa及8.3 MPa;28 d、90 d强度分别为55.7 MPa、59.6 MPa,高于同龄期PC试样3.5 MPa及2.2 MPa。两种水泥浆体早期强度主要受早期水化放热速率、孔结构分布特征的影响,后期高掺量矿渣水泥强度发展的优势在于:矿粉颗粒的填充效应以及二次火山灰活性,使其浆体形成了更多的水化产物,孔结构更加致密,有利于浆体强度的提高。

Aimed at on strength and hydration mechanism of high-slag cement and ordinary Portland cement,strength and strength development coefficient of ordinary Portland cement slurry（ No. PC） and slag cement slurry（ No. SC,mixed with 60% slag） were tested in this paper; And,early hydration heat release rate,hydration product phase and pore structure were further comparison. Results showed that SC sample with the compressive strength 25. 6 MPa at 3 d and 39. 5 MPa at 7d is 13. 3 MPa and 8. 3 MPa lower than PC sample,and 55. 7MPa at 28 d and 59. 6 MPa at 90 d is 3. 5 MPa and 2. 2 MPa higher than PC sample separately. Early strength of two samples mainly affected by early hydration heat release rate and pore structure characteristics,advantage of later strength on SC sample is due to filling effect of slag particles and secondary pozzolanic activity,which result in the more hydration products and more compact of slurry.