High-efficiency Carbonation Modification Methods of Recycled Coarse Aggregates

Abstract

To solve the problem of only surface carbonation and realize high-efficiency carbonation of recycled coarse aggregate, the method of carbonated recycled coarse aggregate with nano materials pre-soaking was first put forward. The carbonation effect of modified recycled coarse aggregate with three different carbonation methods was evaluated, and water absorption, apparent density and crush index of modified recycled coarse aggregate were measured. Combined with XRD, SEM, and MIP microscopic analysis, the high-efficiency carbonation strengthening mechanism of modified recycled coarse aggregate was revealed. The experimental results show that, compared with the non-carbonated recycled coarse aggregate, the physical and microscopic properties of carbonated recycled coarse aggregate are improved. The method of carbonation with nano-SiO₂ pre-soaking can realize the high-efficiency carbonation of recycled coarse aggregate, for modified recycled coarse aggregate with the method, water absorption is reduced by 23.03%, porosity is reduced by 44.06%, and the average pore diameter is 21.82 nm. The high-efficiency carbonation strengthening mechanism show that the pre-socked nano-SiO₂ is bound to the hydration product Ca(OH)₂ of the old mortar with nano-scale C-S-H, which can improve the CO₂ absorption rate, accelerate the carbonation reaction, generate more stable CaCO₃ and nano-scale silica gel, and bond to the dense three-dimensional network structure to realize the bidirectional enhancement of nano-materials and pressurized carbonation. It is concluded that the method of carbonation with nano-SiO₂ pre-soaking is a novel high-efficiency carbonation modification of recycled coarse aggregate.

Keywords

recycled coarse aggregate / pressurized carbonation / high-efficiency carbonation / nano-SiO₂ / strengthening mechanism

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