A chemo-thermo-mechanical problem is solved using a peridynamic approach to investigate crack propagation in non-reinforced concrete at early-age. In the present study, the temperature evolution and the variation of the hydration degree in conjunction with the mechanical behaviour of cement-based materials are examined. Firstly, a new peridynamic model is introduced to solve fully coupled chemo-thermal problems by satisfying thermal equilibrium condition and hydration law simultaneously and then the effects of the chemo-thermal analysis are imposed in the mechanical framework to investigate all the interactions. The proposed approach is used to solve 2D chemo-thermo-elastic problems and then it is applied to investigate the fracture of concrete structures. Additionally, we examine the accuracy of the method by comparing the crack paths, temperature and hydration degree with those achieved by applying other numerical methods and the experimental data available in the literature. A good agreement is obtained between all sets of results.

使用近场动力学方法研究早期非钢筋混凝土中的裂纹扩展，解决了化学-热-机械问题。在本研究中，结合水泥基材料的力学行为，研究了温度的演变和水化度的变化。首先，通过同时满足热平衡条件和水化定律，引入新的近场动力学模型来解决完全耦合的化学-热问题，然后在力学框架中施加化学-热分析的影响以研究所有相互作用。所提出的方法用于解决二维化学热弹性问题，然后将其应用于研究混凝土结构的断裂。此外，我们通过比较裂纹路径来检查该方法的准确性，通过应用其他数值方法和文献中可用的实验数据获得的温度和水合度。在所有结果集之间获得了良好的一致性。