Study on the Property and Mix Ratio of CA and L•SAC Recycled Aggregate Planted Concrete

Abstract This paper studies the influence of different water-cement ratio configuration of recycled aggregate planted concrete on performance, the permeable property and drying shrinkage and the influence of different gelled material against compressive strength. At last, the plant growth performance of the planted concrete is analyzed through the whole process of screening, seeding and long-potential recording of the plants. It is found that the compressive strength of CA-R (recycled aggregate aluminate cement concrete) and L•SAC-R (recycled aggregate have low alkalinity) is higher, which is 7.6 MPa and 7.4MPa, respectively. Compared with the natural aggregate, the against compressive strength of the recycled aggregate is much smaller, and the difference of the experiment blocks with different age conditions is not large; It is better to set the porosity of the planted concrete between 22% and 35%: On the one hand, the total porosity of the recycled aggregate planted concrete is always slightly higher than that of the natural aggregate planted concrete, which is basically maintained at 31.7% and slightly higher than the design value; On the other hand, the total porosity of CA-R is larger than that of L•SAC-R and P•O-R (recycled aggregate ordinary Portland cement concrete), and compared with the total porosity, the variation of connected porosity is not obvious. In addition, the water permeation coefficient of 20-40mm single-stage concrete is between 15-19mm/s; And the dry shrinkage of aluminate recycled aggregate planted concrete is larger, there are different degrees of cracks on the surface and aggregate bonding. Among the three plants selected during the experiment, Festuca arundinacea and Alfalfa had good adaptability, but Bermuda grass had low adaptability.