Li Xin, Cao Mingli
School of Civil Engineering, Dalian University of Technology, Dalian 116024, China.
Materials (Basel). 2024 May 1;17(9):2133. doi: 10.3390/ma17092133.
Limestone is commonly used in cement concrete due to its unique nature and type. It has physical effects (nucleation effect and dilution effect) and chemical effects on the hydration process of cement. This paper reviews the effects of three representative limestone materials on the hydration process, hydration products, and hydration kinetics. In the hydration process, the reaction was delayed by limestone powder with a particle size larger than 20 μm and calcium carbonate whiskers due to their dilutive effect. On the other hand, limestone powder with a particle size smaller than 20 m and calcium carbonate nanoparticles facilitated the reaction through nucleation and chemical effects. Limestone has a similar effect on hydration products, promoting the production of C-S-H through nucleation. The mechanism of action for this nucleation effect depends on the differences in crystalline form and particle size of the three types of micro- and nano-calcium. Chemical effects impact the amount of AFt produced, with the generation of new products being the main reaction influenced by the limestone admixture.
由于其独特的性质和类型，石灰石常用于水泥混凝土中。它对水泥的水化过程具有物理效应（成核效应和稀释效应）和化学效应。本文综述了三种代表性石灰石材料对水化过程、水化产物和水化动力学的影响。在水化过程中，由于其稀释作用，粒径大于20μm的石灰石粉和碳酸钙晶须会延迟反应。另一方面，粒径小于20μm的石灰石粉和碳酸钙纳米颗粒通过成核和化学效应促进反应。石灰石对水化产物有类似的影响，通过成核促进C-S-H的生成。这种成核效应的作用机制取决于三种微纳米钙的晶体形态和粒径差异。化学效应影响AFt的生成量，石灰石掺合料影响的主要反应是生成新产物。
