Abstract: Cement-based materials are currently the most widely used building materials. In the actual application process, cement-based materials will be damaged and fail to meet the expected performance requirements. There are a large amount of Ca(OH)2 crystals in the hydration pro-ducts, which affects the bonding between various cement hydration products, resulting in the reduction of cement-based materials performance. At home and abroad, how to enhance the performance of cement-based materials has become a hot issue in research, and it is necessary to find effective methods to enhance the performance of cement-based materials. By referring to relevant literatures at home and abroad, it is found that fly ash, silica fume, nano-SiO2 (SiO2 as the main component of the three materials, these materials are collectively referred to as silicon-based materials) or slag are added into cement-based materials. Because of its pozzolanic reaction and filling effects, the performance of cement-based materials can be enhanced obviously. The content of Ca(OH)2 in cement-based materials can be reduced by adding admixtures. Admixtures also can reduce its grain size, increase the amount of C-S-H gel, improve the porosity of cement-based materials, and improve its performance. There are some glassy substances in the components of fly ash and slag, which can reduce the water consumption of cement paste and improve the workability. It has low pozzolanic activity, and the hydration rate of cement paste can be reduced by proper addition. The early strength of cement-based materials containing fly ash or slag is lower, and the later strength is higher. Silica fume and nano-SiO2 have high pozzolanic activity, which can promote hydration, and the strength of cement-based materials can be greatly improved in the early stage, but the strength development is slow in the later stage. At the same time, it will increase the early shrinkage of cement-based materials and increase the risk of structural cracking. Different admixtures can produce synergistic enhancement effect. The compound modified cement-based materials with excellent properties can be obtained. This article mainly introduces the application of silicon-based materials and slag in cement-based materials, and describes the research status and related aspects of cement-based materials in terms of mechanism of action, heat of hydration, strength, porosity, etc. The related problems in the current research are analyzed and summarized in order to provide some reference for the production of cement-based materials with excellent performance.
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