Experimental and Theoretical Study on Carbonization Coefficient Model of NS/SAP Concrete

Carbonization coefficient research has great significance in concrete carbonization evaluation. Nano-silica (NS) can reduce the content of Ca(OH)2, which is generated during hydration concrete, resulting improved resistance and compressive strength concrete. This paper investigates effects with internal curing, such as Super Absorbent Polymer (SAP). The shows that SAP promote but form tiny pores after releasing water completely, may cause a reduction carbonation was modified by adding SAP, ranging from 0 to 0.24%, ascertain optimal SAP. addition NS changed 1.5% confirm range NS. To establish reasonable suitable theoretical model NS/SAP influence factors were analyzed first. Later, accelerated test carried out on 100 mm × cube specimens different time obtain depth Before analyzing experimental data, randomly divided into fitting validation groups. Based regression analysis group, established, embodied various parameters carbonization, including content, water–cement ratio, CO2 concentration, temperature, relative humidity, strength. According verification mean error 5.04%, residual square 0.1751. Compared literature models, this study’s accurately predict