Experimental and field study on treatment waste mud by in situ solidification

Abstract

Waste mud processing is an urgent problem in in situ construction with no existing method of address. Identifying a highly effective, low-energy and environmentally friendly treatment method would hold great significance. This paper introduces a fast, economic and environmentally friendly construction technology centred on the in situ solidification process. After solidification, bearing capacity and strength of mud pool increases rapidly and it can then be used as roadbed filling or directly as a highway roadbed or building foundation. Combined with the actual general situation of projects, laboratory mixing tests were conducted by using the cement, fly ash, superfine slag powder and plant ash as solidification additives. Vane strength and in situ loading tests were conducted, in which waste mud processing effects were evaluated using the proposed in situ solidification construction technology as a basis. In addition, exponential curve and hyperbolic models were adopted to fit incomplete original loading data, from which the ultimate bearing capacity of the testing field region was obtained. A bearing capacity prediction technique evaluating in situ solidification technology suitable for field use was proposed through comparison and analysis of contrasting measured results.