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

本研究涉及宽级配水泥的发展，矿物组成改性水泥的研制，级配与矿物组成双改性水泥的开发与评价，级配与矿物组成双改性水泥混凝土的实用化研究。研究结果如下：1.宽级配水泥密实度高，需要较低的外加剂用量才能获得高流动性混凝土；2.贝利特含量高的水泥可以降低水化热和自收缩，降低混凝土的粘性；3.尽管宽级配水泥配制的混凝土早期抗压强度发展缓慢，但可以获得较高的长期强度。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融性能优异，其抗碳化实际上不存在问题。

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.