Experimental investigation of clay-straw building finishing layer under different drying conditions

This manuscript represents investigation of six different clay mixtures under variable drying conditions, namely: bright yellow clay (typical for Lithuania), brown clay (Lithuania Sergėnai district), mixture of different clays, white Spanish clay, clay mass which is resistant for thermal coldness (with synthetic cardigan) and Lithuanian coarse clay with granite additives. Drying process was provided imitating natural drying process and fast drying in drying oven at 110 C°. The main idea of this study – imitate clay and clay-straw buildings drying process and to determine which of used clay types had smallest volumetric and linear deformations. Volumetric and linear deformations for clay-straw buildings is one of the most important factors evaluating cracking in this type of buildings. To reach this purpose six tiles of different clay types were used. Before drying stage water content, plasticity, and liquid limits index, respectively was determined for all types of clay. All clay tiles volumetric and linear deformations before and after drying process were measured with specialized view analysis program in order not to damage samples’ form. According to the obtained results a clay type whith the smallest deforamations (volumetric and linear) was found. With the smallest volumetric and linear deformations clay-straw building is not only environmental friendly, sustainable and green, but it does not require a lot of maintenance during building life time

Research of deformation of clay soil mixtures mixtures / Molinių gruntų mišinių deformacijų tyrimas

The aim of this article is to determine clay soils and clay soils mixtures deformations during drying. Experiments consisted from: a) clay and clay mixtures bridges (height ~ 0,30 m, span ~ 1,00 m); b) tiles of clay and clay, sand and straw (height, length, wide); c) cylinders of clay; clay and straw; clay, straw and sand (diameter; height). According to the findings recommendations for clay and clay mixtures drying technology application were presented. During the experiment clay bridge bearing capacity and failure mode were determined. For investigations Vilnius Gediminas Technical University Civil Engineering Scientific Research Center infrastructure was used. Santrauka Tyrimo tikslas – nustatyti molinio grunto mišinių džiūvant atsirandančias deformacijas. Eksperimentams buvo naudojama: a) moliniai ir molio mišinių tiltai (aukštis ~0,30 m, tarpatramis ~1,00 m, plotis 0,07–0,1 m); b) plytelės iš molio; molio, smėlio ir šiaudų (l; b; h); c) cilindrai iš molio; molio ir šiaudų; molio, šiaudų, smėlio (d; h). Pagal gautus bandymo rezultatus pateiktos rekomendacijos molinių gruntų mišinių džiovinimo technologijai taikyti. Nustatyta molinių tiltų laikomoji galia ir suirimo pobūdis. Atliekant tyrimus buvo pasinaudota Vilniaus Gedimino technikos universiteto Civilinės inžinerijos mokslo centro MTEP infrastruktūra. Reikšminiai žodžiai: molis; smėlis; gruntas; šiaudai; deformacijos; tiltai; grunto ir organikos mišiniai.