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Waste construction slurry is a by-product of engineering construction, and the realization of eco-friendly disposal and resource utilization of waste construction slurry is an urgent problem to be solved in the engineering field. In this study, a new method for preparing water and fertilizer retention by chemical cross-linking of the waste slurry was proposed, which can achieve low-energy, rapid disposal of waste slurry in situ and obtain a planting matrix with slow-release and water-retention effects. The detailed study of the microstructure, slow-release performance, and biological toxicity of the slurry soft consolidation product proves that this method can effectively treat and utilize the waste slurry produced in the construction process. The test results show that the three-dimensional networks in soft consolidation product can effectively lock the slurry's water molecules and solid particles and avoid outflow pollution. Meanwhile, the mixed fertilizer can be evenly distributed in the soft consolidation product. Under simulated rainwater, the nutrient release rate in 25 days is 44.47%, showing excellent slow-release performance. In general, the soft consolidation product of waste slurry is a planting matrix that meets the basic green planting requirements, which provides a good solution for civil industry to achieve low-carbon disposal of waste slurry. [ABSTRACT FROM AUTHOR]

In order to apply the fiber reinforced cement stabilized waste construction slurry more widely, it is crucial to evaluate its mechanical behavior under freeze and thaw (F–T) cycles. The mechanical properties of fiber cement-modified waste construction slurry (FCMS) under five different F–T cycles were studied using unconfined compressive strength tests. One fixed cement sample with five different types of polypropylene fiber was used in the FCMS. Using the meso random damage model, the two-stage damage stress–strain relationship of FCMS was established using particle swarm optimization (PSO). The results were as follows: (1) The mechanical properties of FCMS at room temperature and in an F–T environment were significantly improved by fiber; (2) The elastic modulus of FCMS decreased in the form of a power function with the increase of F–T cycles; (3) The fitting results of the two-stage F–T damage model based on meso random damage theory were in agreement with the measured data. [ABSTRACT FROM AUTHOR]