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Permeability, compressive strength and Proctor parameters of silts stabilised by Portland cement and ground granulated blast furnace slag (GGBFS)

Lindh Per, Lemenkova Polina

Archive of Mechanical Engineering

2022

LXIX, nr 4

667--692

The study investigates the effect of Portland cement and ground granulated blast furnace slag (GGBFS) added in changed proportions as stabilising agents on soil parameters: uniaxial compressive strength (UCS), Proctor compactness and permeability. The material included dredged clayey silts collected from the coasts of Timrå, Östrand. Soil samples were treated by different ratio of the stabilising agents and water and tested for properties. Study aimed at estimating variations of permeability, UCS and compaction of soil by changed ratio of binders. Permeability tests were performed on soil with varied stabilising agents in ratio H WL B (high water / low binder) with ratio 70/30%, 50/50%, and 30/70%. The highest level of permeability was achieved by ratio 70/30% of cement/slag, while the lowest - by 30/70%. Proctor compaction was assessed on a mixture of ash and green liquor sludge, to determine optimal moisture content for the most dense soil. The maximal dry density at 1.12 g/cm 3 was obtained by 38.75% of water in a binder. Shear strength and P-wave velocity were measured using ISO/TS17892-7 and visualised as a function of UCS. The results showed varying permeability and UCS of soil stabilised by changed ratio of CEM II/GGBS.

Comparative Analysis of Knits from Peat Fibre and its Combinations with Other Natural Fibres

Mikučioniené D., Čepukonė L.

Fibres & Textiles in Eastern Europe

2017

Vol. 25, no. 2 (122)

24--29

Natural and man-made fibres of natural origin are more and more widely used, while consideration of sustainability is constantly increasing. The properties and processing behaviour of newly introduced fibres of natural origin are usually compared and often predicted on the basis of widely investigated fibres; however, this prediction sometimes does not have any confirmed basis. Structural parameters and the majority of mechanical and physical properties of knitted fabrics depend on technical characteristics of the knitting machine, on the properties of yarns as well as on the origin of the raw material. This study attempts to develop knits from new natural peat fibres and their combination with widely used woollen, cotton and elastomeric Lycra yarns and to investigate the influence of peat fibre’s nature on structural parameters such as loop length, wale and course spacing, area density, the tightness factor and on main physical properties such as dimensional stability, air permeability and water adsorption.

Włókna naturalne i sztuczne pochodzenia naturalnego są coraz szerzej stosowane. Właściwości i sposób przetwarzania nowych włókien pochodzenia naturalnego są często przewidywane na podstawie dobrze znanych włókien, jednak ta prognoza czasami nie ma żadnych potwierdzonych podstaw. Parametry strukturalne i większość właściwości mechanicznych i fizycznych dzianin zależą od właściwości technicznych maszyn dziewiarskich i właściwości przędzy, a także od pochodzenia surowca. W pracy podjęto próbę otrzymania dzianin z włókien torfowych i ich kombinacji z wełną, bawełną i Lycrą. Badano wpływ włókna torfowego na parametry strukturalne, takie jak: długość nitki w oczku, ścisłość kolumienkową i rządkową, ścisłość, stabilność wymiarów, przepuszczalność powietrza i adsorpcję wody.