气候变化领域集成服务门户(CCPortal): Small to large strain mechanical behaviour of an alluvium stabilised with low carbon secondary minerals

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DOI	10.1016/j.conbuildmat.2019.117174
	Small to large strain mechanical behaviour of an alluvium stabilised with low carbon secondary minerals
	Sargent P.; Rouainia M.; Diambra A.; Nash D.; Hughes P.N.
发表日期	2020
ISSN	9500618
卷号	232
英文摘要	Deep dry soil mixing is a popular ground improvement technique used to strengthen soft compressible soils, with Portland cement being the most popular binder. However, its continued use is becoming less sustainable given the high CO2 emissions associated with its manufacture. Alkali-activated cements are considered to be viable low carbon alternative binders, which use industrial waste products such as blast furnace slag. This study focusses on the stabilisation of a potentially liquefiable soft alluvial soil using a dry granulated binder comprising sodium hydroxide-activated blast furnace slag (GGBS-NaOH). This binder has previously been demonstrated by the authors to have potential as a replacement for Portland cement due to its excellent engineering performance, positive contributions towards the circular economy, reducing energy usage and CO2 emissions in the construction sector. A detailed comparison in mechanical behaviour is presented between the soil in its reconstituted, undisturbed and cemented states after 28 days curing through the use of advanced monotonic triaxial testing techniques, including small strain measurements. Mechanical behaviour was specifically analysed regarding peak deviatoric strength, pore pressure response, stress – volumetric dilatancy, shear stiffness degradation over small to large strain ranges, critical state and failure surfaces. Using 7.5% GGBS-NaOH increased the stiffness and shear strength of the soil significantly, whereby the shear strains at which initial shear stiffness degrades is three times higher than the untreated undisturbed soil. As a result, larger amounts of dilation was observed during shearing of the material and resulted in an upward shift of the soil's original critical state line due to the creation of an artificially cemented soil matrix through the precipitation of C-(N)-A-S-H gels. Elsevier Ltd
英文关键词	Alluvium; GGBS; Low carbon; Mechanical behaviour; Stiffness degradation; Triaxial
scopus关键词	Binders; Blast furnaces; Carbon; Carbon dioxide; Construction industry; Critical current density (superconductivity); Energy utilization; Portland cement; Slags; Sodium hydroxide; Soil cement; Soil testing; Soils; Stiffness; Strain; Alluvium; GGBS; Low carbon; Mechanical behaviour; Stiffness degradation; Triaxial; Shear strength
来源期刊	Construction and Building Materials
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/176990
作者单位	Stephenson Building, School of Computing, Engineering and Digital Technologies, Stephenson Street, Teesside University, Middlesbrough, Tees Valley, TS1 3BA, United Kingdom; Drummond Building, School of Engineering, Newcastle University, Newcastle upon TyneTyne and Wear NE1 7RU, United Kingdom; Queens Building, Department of Civil Engineering, University of Bristol, University Walk, Clifton, Bristol, BS8 1TR, United Kingdom; Christopherson Building, Department of Engineering, Durham University, Lower Mountjoy, South Road, Durham, DH1 3LE, United Kingdom
推荐引用方式 GB/T 7714	Sargent P.,Rouainia M.,Diambra A.,et al. Small to large strain mechanical behaviour of an alluvium stabilised with low carbon secondary minerals[J],2020,232.
APA	Sargent P.,Rouainia M.,Diambra A.,Nash D.,&Hughes P.N..(2020).Small to large strain mechanical behaviour of an alluvium stabilised with low carbon secondary minerals.Construction and Building Materials,232.
MLA	Sargent P.,et al."Small to large strain mechanical behaviour of an alluvium stabilised with low carbon secondary minerals".Construction and Building Materials 232(2020).