Development of cement for high-performance concrete by modifying grading and mineral composition

本研究内容包括宽级配水泥的研制、矿物成分改性水泥的研制、级配矿物双改性水泥的研制与评价以及级配矿物双改性水泥混凝土的应用研究。研究结果表明：1.宽级配水泥由于其高流动性，需要低掺量的外加剂，以获得高流动性的混凝土，并节省搅拌机的功率消耗，因为它降低了混凝土的粘度; 2.高贝利特含量的水泥可以减少水化热和自收缩; 3.虽然使用宽级配水泥的混凝土的抗压强度发展在早期缓慢，但可以预期一个高的长期强度。它在91天内的抗压强度超过120 MPa。4使用宽级配水泥制成的混凝土的抗冻性和抗融性非常出色，其抗碳化性几乎没有问题。

This research deals with development of wide-graded cement, development of mineral composition modified cement, development and evaluation of cement modified both grading and mineral composition, and practical study on concrete using cement modified both grading and mineral composition. The results are summarized as follows :1.Wide-graded cement requires a low admixture dosage to obtain high flowability concrete, due to its high compactability, and saves power consumption of the mixer, as it reduces the viscosity of concrete.2.Cement of which belite content is high enables the reduction of heat of hydration and autogenous shrinkage.3.Though the compressive strength development of concrete made using wide-graded cement is slow at early ages, a high long-term strength can be expected. It develops a compressive strength of more than 120MPa at 91 days.4 Resistance to freezing and thawing of concrete made using wide-graded cement is excellent, and its resistance to carbonation practically poses no problem.