Construction sludge frequently has high alkalinity after its generation or during the intermediate treatment process. The aim of this study is to experimentally investigate the potential of combining accelerated carbonation and a paper sludge ash-based stabilizer (PSAS) to neutralize the alkalinity of construction sludge in a short period and to improve its strength for use as a recycled material. The experimental results indicate that the addition of a PSAS significantly granulated the alkaline sludge, and once granulated, the PSAS successfully accelerated the pH neutralization of the alkaline sludge. It was also found that the decrease in dry density ρ_d and the degree of saturation S_r of the PSAS-treated sludge was able to reduce the period required for the pH neutralization, t_N. The decrease in ρ_d is thought to allow fresh CO₂ gas to penetrate the specimen more easily. However, if S_r is below a certain limit, it does not strongly facilitate the reduction of t_N. This implies that pH neutralization cannot be accelerated when the amount of water in the sludge is below a certain level. Moreover, it was found that mean particle diameter D₅₀ also affected t_N. The strength development of the PSAS-treated sludge was evaluated using a series of cone index tests. It was found that the strength of the alkaline sludge without the PSAS was significantly decreased by accelerated carbonation, but was significantly increased even after accelerated carbonation when the PSAS was present. Due to the porosities of the remaining PS ash particles, most of the contribution of the water absorption and retention performance of the PSAS to the strength development of the PSAS-treated sludge was secured after accelerated carbonation. In addition, the granulated particles of the PSAS-treated sludge retained their granular shape to some extent. Therefore, it is presumed that the friction and interlocking of the particles did not decrease significantly. It was also found that, after carbonation, the q_c of the PSAS-treated sludge increased more rapidly than that of the alkaline sludge without the PSAS. A further detailed examination of the test results showed that under air-curing conditions, the q_c of the treated sludge with accelerated carbonation increased relatively gradually compared to that of the treated sludge without accelerated carbonation.

建筑污泥在产生后或在中间处理过程中经常具有高碱度。本研究的目的是通过实验研究将加速碳化和纸污泥灰基稳定剂 (PSAS) 相结合，在短时间内中和建筑污泥的碱性并提高其强度以用作回收材料的潜力。实验结果表明，加入 PSAS 显着造粒碱性污泥，一旦造粒，PSAS 成功地加速了碱性污泥的 pH 中和。还发现干密度ρ _d和饱和度S _{r 的降低}经 PSAS 处理的污泥能够减少 pH 中和所需的时间t _N。ρ _d的减小被认为允许新鲜的 CO ₂气体更容易地渗透样品。然而，如果S _r低于某个限度，它不会强烈地促进t _N的减少。这意味着当污泥中的水量低于一定水平时，不能加速 pH 中和。此外，发现平均粒径D ₅₀也影响t _N. 使用一系列锥度指数测试评估 PSAS 处理污泥的强度发展。发现没有 PSAS 的碱性污泥的强度因加速碳化而显着降低，但当存在 PSAS 时，即使在加速碳化后也显着增加。由于剩余 PS 灰颗粒的孔隙率，在加速碳化后，PSAS 的吸水和保水性能对 PSAS 处理污泥的强度发展的大部分贡献得到保证。此外，经 PSAS 处理的污泥的颗粒在一定程度上保留了其颗粒形状。因此，推测颗粒的摩擦和互锁没有显着降低。还发现，碳酸化后，经 PSAS 处理的污泥的q _c比没有 PSAS 的碱性污泥增加得更快。对试验结果的进一步详细检查表明，在空气固化条件下，与未加速碳化的处理污泥相比，加速碳化处理的污泥的q _c相对逐渐增加。