Optimization groundconcrete composition for filling of underground workings
Journal Title: Вісник Одеської державної академії будівництва та архітектури - Year 2017, Vol 1, Issue 66
Abstract
Construction of buildings and structures in Odessa region is complicated by the presence of large areas of soil subsidence and undermined territories of underground mine workings (catacombs). They generate a high probability of surface failures. Therefore, the elimination of the old underground workings, when increasing height of newly built residential buildings and loads on foundations, is a current goal. The goal is to use clay (waste production of clay rock) for making concrete and the laying of underground mining, clusters, voids, and fractures. To exclude the deformation of the surface, to provide normal operation of internal and external engineering networks with laying-out of worked-out areas. Eliminating the pores and voids of the underground mine workings is to ensure the operational reliability of buildings and structures in the region of seismic resistance up to 7 points. To ensure the durability of construction objects, located above the mine workings. Objectives of research: develop formulations and study the properties of backfill material for the elimination of excavations. Methods of lightweight concrete selection according to requirements of normative documents. Two basic requirements are presented: the workability of the concrete mix supplied the concrete pipe and concrete strength grades in the range of 15-25. The factors, determining the performance of mix and concrete, are studied: mobility, composition, water-cement ratio, the presence of the filler and the increase of concrete strength with time. The results of the studies: compositions of soil cement with mobility OK=12-14 cm on Strasznie cone, intended for transportation of concrete pumps pipes are selected. On their basis concrete in the range of grades M15-35 with a consumption on 1 m3 of soil cement was obtained: loam 1m3 (1000 kg) of Portland cement grade 400, in the range of 80-175 kg/C=3,5-6,0.
Authors and Affiliations
M. V. , Mitinskaya, A. , Kucherenko, T.A. , Suchecka
Keywords
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