An Elastic Modulus Developing Model of Fly Ash Concrete under Sustained Load

作者：Jia, Si-yi; Liu, Ming-hui^*; Han, Bing; Xie, Hui-bing

来源：KSCE Journal of Civil Engineering, 2018, 22(7): 2417-2424.

DOI：10.1007/s12205-017-1852-7

• fly ash concrete
• elastic modulus
• sustained load
• triple-phase spherical model
• loading age
• loading level

This paper focuses on the developing rule of elastic modulus of Fly Ash Concrete (FAC) under sustained load. Mechanism of the action of sustained load on concrete is discussed and a new model for the elastic modulus of FAC is constructed based on the Triplephase Spherical Model (TSM). An experiment with three concrete mix designs and five testing groups were conducted. The experimental compressive strength and elastic modulus at six different ages were used to calibrate the parameters in the model. Influences of two important parameters (loading age and loading level) in the model were analyzed. Test data confirmed the fact that elastic modulus for the loaded concrete have a small increment compared to the non-loaded, which is more evident for younger concrete, and calculation results showed that the newly constructed model can well predict the elastic modulus of concrete under sustained load. Besides, compared to the loading age, the loading level was proved to be a more important factor in deciding the development rule of elastic modulus for the loaded concrete.

• 出版日期2018-7
• 单位北京交通大学