Study on the performance of vegetation concrete prepared based on different cements

In this paper, 16 ∼ 19 mm gap-graded aggregate and different cement were used to prepare vegetation concrete (VC). The effect laws of cement types (ordinary Portland cement, Portland slag cement, sulphoaluminate cement, aluminate cement) on the mechanical properties, water permeability, sound absorption and vegetation-growing performance of VC were analyzed. The results show that aluminate cement has the most significant effect on the mechanical properties of VC in the early stage (7d), Portland slag cement has an obvious improving effect on the mechanical properties of VC in the middle and late stages (14d, 28d), and its sound absorption performance, pH value and vegetation-growing performance, while ordinary Portland cement has the best effect on the water permeability of VC and the vegetation resistance. Thus, it is recommended to use Portland slag cement to prepare vegetation concrete. In addition, SEM, XRD and TG-DTG tests were conducted out on VC under different cement types. The analysis showed that Portland slag cement specimens were rich in hydration products and closely connected, with fewer pores and cracks, and the structural compactness was better. The intensity of Ca(OH)2 diffraction peak in the XRD pattern was significantly lower than that of ordinary Portland cement specimens. The mass loss rate in the range of 0 ∼ 400 °C in the TG curve was higher than that of ordinary Portland cement specimens, indicating that the compressive strength of Portland slag cement specimens was better than that of ordinary Portland cement specimens, which was consistent with the change law of VC macroscopic mechanical properties.