低钙玻璃态环境节能型胶凝材料的研究

STUDY OF CEMENTITIOUS MATERIALS OF SURROUNDING SAVING ENERGY OF LOW CALCIUM

阐述了低钙玻璃态环境节能型胶凝材料研究的意义并提出了有关的科学问题 .以矿渣、磷渣和粉煤灰为对象研究了CaO -Al2 O3-SiO2 和Al2 O3-SiO2 胶凝材料的强度发展、活化和水化机制 ,通过外加剂和混合材的复合化技术 ,提出研制高性能低钙玻璃态环境节能型胶凝材料的技术途径 .

This paper state the significance of the study of energy-saving cementitious materials and scientific questions involved. The strength development, activation and hydration mechanism of CaO-Al2O3-SiO2 and Al2O3-SiO2 system such as blast furnace slag, phosphorous slag and fly ash are studied. Technical ways of making high performance cementitious materials by means of admixtures and additives with low calcium are proposed. Results show that for high content slag cement, compound admixtures with three components shall be generally adapted, in order to develop both early and later stage properties. When slag mass content is 70%, it exceeded the standard of 525 grade slag cement. When slag mass fraction rose to 80%—85%， the strength could reach or exceed 425 grade slag cement. When slag mass content is 90%, the compressive strength of 28 d reached 46 MPa. For high content phosphorousslag cement, with 70% phosphorous slag in mass, the strength can reach the standard of 525 grade phosphorous slag cement by selecting appropriate admixture and controlling the fineness of cement. For high content (BFS-PHS) slag-phosphorous complex cement, the total content of blended materials can increase due to the effect of mutual complement of superiority. Using the same admixtures, the properties of the complex cement with 70% blended materials in mass can reach the standard of 525 grade slag cement. For high slag fly ash blended cement, adapting the admixture technique, the strength and pore structure are all obviously improved, especially at early stage.