Analysis of compressive strength of reclaimed aggregate concrete modified by nano-composite

Abstract

In order to save the consumption of natural high quality aggregate and improve the utilization rate of nano-composite materials, the investigation on the compressive strength and water permeability of nano-composite modified reclaimed aggregate concrete materials was proposed. In this experiment, reclaimed nano-ceramic aggregate was used to replace natural aggregate, and the effects of reclaimed aggregate substitution rate, water-cement ratio and target porosity on the compressive strength and permeability coefficient of reclaimed ceramic aggregate pervious concrete were studied. The reclaimed ceramic aggregate was pretreated with modifier. The results show that with the increase of substitution rate, the compressive strength decreases and the permeability coefficient has little difference. With the increase of water-cement ratio, the compressive strength increases first and then decreases, and the water permeability coefficient has little difference, but the value is lower when the water-cement ratio is greater than 0.4. As the target pore increases, the compressive strength decreases and the permeability coefficient increases. The optimal test scheme is as follows: the replacement rate is 40 %, the water-cement ratio is 0.35, and the porosity is 15 %. In this case, the performance of the specimen is better.

Conclusion

With the increase of replacement rate, the performance index of recycled aggregate decreases, the compressive strength of pervious concrete decreases continuously, and the permeability coefficient has little difference. With the continuous increase of water-cement ratio, the compressive strength increases first and then decreases, which can meet the construction requirements.