Micro-pore structure characteristics and macro-mechanical properties of PP fibre reinforced coal gangue ceramsite concrete

Abstract

Adding polypropene (PP) fibre can enhance the mechanical properties of coal gangue ceramsite concrete (CGCC), which is a kind of green concrete for solid waste utilisation. However, there is a lack of data concerning the effects of PP fibre content on the micro-pore structure characteristics and macro-mechanical properties of CGCC. This investigation aims at exploring the optimum PP fibre content and establishing the relationship between micro-pore structure characteristics and macro-mechanical properties, which provides a reference for optimising the mixture ratio. Based on low-field nuclear magnetic resonance technology and mechanical strength test, micro-pore structure characteristics and macro-mechanical properties of CGCC with different PP fibre content of 0, 0.6, 0.9, and 1.2 kg m^−3, respectively, were studied. The results showed that when the fibre content was 0.6kg m^−3, the mechanical strength was the highest and the increase of splitting tensile strength was the largest. Moreover, PP fibre can effectively reduce the most probable pore diameter and can transform harmful pores to harmless pores with the optimum content of 0.6 kg m^−3. In conclusion, appropriate PP fibre addition has a significantly improving effect on the micro-pore structure characteristics and macro-mechanical properties of CGCC.

Keywords

• nuclear magnetic resonance
• concrete
• mechanical strength
• compressive strength
• tensile strength
• coal
• porosity
• micropore structure characteristics
• macro-mechanical properties
• pp fibre reinforced coal gangue ceramsite concrete
• cgcc
• pp fibre content
• mass 0.6 kg
• mass 0.9 kg
• mass 0.0 kg