The aim of this article – to determine short term and long term strengthening of clay soil, by strengthening it with fly ash obtained during the production of mineral wool.
This article introduces research which is used to determine the optimal ratio of fly ash in cement suspension for strengthening of clay soil. Samples which were investigated in this research work
prepared by mixing Portland cement, mineral wool fly ash, clay powder, sand and water. All investigated samples compressive strength after 6 months exceeded 1.7 MPa. It is enough of such strength
in geotechnics to conduct strengthening of soil and it is possible to argue that soil is strengthened.
Abstract. Just as other structural elements, ground slabs are an important unit of a building. It is especially true in the case of buildings, such as logistic centres, for which the primary purpose is storage of various goods. In this kind of buildings, floor slabs usually have high loads. For buildings where truck lifts are used, there are special requirements for flatness tolerance across and along the driving track of truck lifts. Therefore, the floor settlement differences in selected distances are limited. In localities where the soils under the floor slab are weak, they should be replaced or compacted. If these solutions are not possible or economically inappropriate, the slabs have to be supported on piles that must be based on strong deep soils. During the design process, it is very important to assign a proper value of rigidity of the piles. Pile stiffness has an enormous influence on the settlement of the slab as well as on the reinforcement intensity of the slab or even on the slab thickness. This paper presents the methodology for the evaluation of pile stiffness. In addition, it provides recommendations for the calculation of the floor slab on the piles. Calculations and obtained results confirmed the importance of certain design stages.
Today waste management is one of the most important environmental problems, danger that used landfills and their collected leachate can cause. This paper analyses the filtration coefficient of soils typical of landfill assessment by air conditions and different density of soils. Heavy metal concentrations were determined by using the flame absorption spectrometric method. Besides, the results of modeling heavy metal permeability are presented here. Dependence of heavy metal permeability characteristics on soil density are described. Experimental investigation and modeling of heavy metal permeability in the soil allowed us to determine that the least permeable soil is dusty sandy grit.
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