Effect of Nano-Additives on the Strength and Durability Characteristics of Marl

Low bearing capacity soils may pose serious construction concerns such as reduced bearing capacity and excessive hydro-associated volume changes. Proper soil remediation techniques must be planned and implemented before commencing any construction on low bearing capacity soils. Environmentally friendly soil stabilizers are gradually replacing traditional soil stabilizers with high carbon dioxide emissions such as lime and cement. This study investigated the use of an alternative pozzolanic mix of nano-additives (i.e., nano-silica and nano-alumina) and cement to reduce the usage of cement for achieving competent soil stabilization outcomes. A series of unconfined compressive strength (UCS), direct shear, and durability tests were conducted on marl specimens cured for 1, 7, and 28 days stabilized with nano-additives (0.1~1.5%), 3% cement, and combined 3% cement and nano-additives. The UCS and shear strength of stabilized marl increased with nano-additives up to a threshold nano-additive content of 1% which was further intensified with curing time. Nano-additive treated cemented marl specimens showed long durability under the water, while the cemented marl decomposed early. The microfabric inspection of stabilized marl specimens showed significant growth of calcium silicate hydrate (CSH) products within the micro fabric of nano-silica treated marl with reduced pore-spaces within aggregated particles. The results confirmed that nano-additives can replace cement partially to achieve multi-fold improvement in the strength characteristics of the marl.

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WETTING AND DRYING RESISTANCE OF LIME-STABILIZED EXPANSIVE SOILS MODIFIED WITH NANO-ALUMINA

Elektronički časopis građevinskog fakulteta Osijek ◽

10.13167/2021.22.6 ◽

2021 ◽

Vol 12 (22) ◽

pp. 70-80

Author(s):

Jijo James ◽

◽

S V Sivapriya ◽

Sajid Ali ◽

T R Madhu ◽

...

Keyword(s):

Soil Stabilization ◽

Expansive Soils ◽

Ground Improvement ◽

Primary Objective ◽

Optimal Combination ◽

Construction Sites ◽

Wetting And Drying ◽

Nano Alumina ◽

Stabilized Soil ◽

Strength And Durability

Weak soil at construction sites necessitates ground improvement. Chemical stabilization is typically carried out using either lime or cement. The primary objective of this study was to assess the strength and durability of lime-stabilized soils modified with nano-alumina (NA). This study adopted the scientifically established initial consumption of lime (ICL) content for soil stabilization. In addition, nano-alumina was added in varying percentages as an auxiliary additive. It was observed that 0.5 % of nano-alumina was optimal with respect to the ICL for maximizing the soil stabilization. The stabilized soils were cured for 0, 7, 14, and 28 days. Post-curing testing revealed that the strength increased sixfold for the optimal combination, compared with the virgin soil. To understand the durability behavior of the optimal combination, the stabilized soil specimens were subjected to wetting and drying cycles after 28 days of curing. The optimal combination was nearly as durable as that of the lime-stabilized soil subjected to five cycles of wetting and drying.

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ANALYSIS OF LATERITE SOIL WITH PORTLAND CEMENT MIXED VARIATIONS AND THE EFFECT ON THE CBR UNSOAKED

Jurnal Gradasi Teknik Sipil ◽

10.31961/gradasi.v5i2.1205 ◽

2021 ◽

Vol 5 (2) ◽

pp. 60-73

Author(s):

Ahmad Ravi ◽

Hurul 'Ain ◽

Betti Ses Eka Polonia ◽

M. Hanif Faisal

Keyword(s):

Bearing Capacity ◽

Soil Stabilization ◽

Road Construction ◽

Chemical Compounds ◽

Soil Improvement ◽

Expansive Clay ◽

Traffic Loads ◽

Construction Loads ◽

Strength And Durability ◽

Test Result

Ketapang and Kayong Utara Regency have road construction that often suffers damage before the planned life age caused by the behavior of expansive clay. The subgrade is a fundamental structure in building road construction because the subgrade will support traffic loads or construction loads. The strength and durability of the pavement structure road will depend on the properties and bearing capacity of the subgrade. Practically soil stabilization is a reinforcement engineering against foundation or subgrade by using mixed materials. Therefore, different soil improvement variations are needed. Based on the test result, the CBR value of Sukadana initially gets a 2.95% point. The CBR value for the 6% and 10 % mixture, respectively, gets 17.14% and 25.02%. The CBR value of Sungai Melayu Rayak originally get 4.65% point. Then, for the 6% and 10% mixture, the CBR values increased by 13.78% and 18%. The value of the bearing capacity of the highway soil construction can be know from the results of CBR testing on each variation. The CBR also can measure the strength of the soil. The addition of cement to the earth tends to increase the bearing capacity of the ground. It is because cement can function as a binder between soil particles with chemical compounds contained in cement.

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Southward shift of the global wind energy resource under high carbon dioxide emissions

Nature Geoscience ◽

10.1038/s41561-017-0029-9 ◽

2017 ◽

Vol 11 (1) ◽

pp. 38-43 ◽

Cited By ~ 64

Author(s):

Kristopher B. Karnauskas ◽

Julie K. Lundquist ◽

Lei Zhang

Keyword(s):

Carbon Dioxide ◽

Wind Energy ◽

Carbon Dioxide Emissions ◽

Energy Resource ◽

High Carbon ◽

Southward Shift ◽

High Carbon Dioxide

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Effect of Nanoparticles on Strength and Durability Properties on Cement Mortar

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.857.65 ◽

2016 ◽

Vol 857 ◽

pp. 65-70 ◽

Cited By ~ 3

Author(s):

P. Prathebha ◽

Santhappan Aswini ◽

J. Revathy

Keyword(s):

Ferric Oxide ◽

Cement Mortar ◽

Cementitious Materials ◽

Nano Particles ◽

Nano Silica ◽

Chloride Permeability ◽

Split Tensile Strength ◽

Durability Properties ◽

Nano Alumina ◽

Strength And Durability

The nanotechnology provides an impact on construction industry materials with new properties and produce material with better performance. This paper presents the experimental investigation on the effects of nano particles incorporated in the cementitious materials to study the strength and durability properties of cement mortar. Nano particles such as nano alumina (NA), nano ferric oxide (NF) and nano silica (NS) were mixed at different proportions of 0.5%, 1% and 1.5% by weight of binder in single and binary combinations. Mechanical properties such as compressive strength and split tensile strength; durability properties such as water absorption and rapid chloride permeability test were tested as per standards. The results showed that 1.5% of the combination of nano silica & nano ferric oxide (NSF) and nano silica & nano alumina (NSA) particles increased the mechanical strength and durability properties of cement mortar. The microstructure characteristics results revealed that the nano particles incorporated cementitious materials showed the voids were filled up with nano particles. It acts as filler in cement mortar that enhanced a dense microstructure, reduced the quantity and size of calcium hydroxide and also filled the voids of C-S-H gel structure.

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Research on the Application of Low Carbon Concept in the Design of Vernacular Architectures

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.281.258 ◽

2011 ◽

Vol 281 ◽

pp. 258-262

Author(s):

Jian Zhou

Keyword(s):

Construction Industry ◽

Carbon Dioxide Emissions ◽

Architectural Design ◽

Construction Materials ◽

Vernacular Architecture ◽

Advanced Technology ◽

Low Carbon ◽

High Carbon ◽

Construction Mode ◽

High Carbon Dioxide

This paper starts from the concept of low-carbon building, aiming at the high carbon dioxide emissions in Chinese construction industry; by way of surveys and researches, it discusses the scientificity of the shape, the construction materials, and construction mode of traditional vernacular architecture. Combining current advanced technology of low carbon emissions, this paper studies the main methods for villages and towns to start low carbon architectural design in the future.

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Assessment of Carbon Footprint of Various Cotton Knitwear Production Processes in Bangladesh

AATCC Journal of Research ◽

10.14504/ajr.8.6.6 ◽

2021 ◽

Vol 8 (6) ◽

pp. 47-57

Author(s):

Md. Ruhul Amin ◽

Md. Arif Mahmud ◽

Ferdausee Rahman Anannya

Keyword(s):

Carbon Dioxide ◽

Carbon Footprint ◽

Water Consumption ◽

Carbon Dioxide Emissions ◽

High Carbon ◽

Production Processes ◽

Fabric Structure ◽

Consumption Data ◽

Fabric Weight ◽

High Carbon Dioxide

Carbon footprint is defined as the amount of greenhouse gases generated during the whole lifetime or within a specific boundary of a product. This study measured the average carbon footprint of some common cotton knitwear T-shirts, polo shirts, and fleece jackets during production using CCalC2 software. Energy and water consumption data were taken as the study's input, while direct and indirect emissions were not specified. The results show the amount of carbon dioxide emitted at different stages of knitwear production. Cotton processing and yarn spinning resulted in relatively high carbon dioxide emissions, while wet treatment gave similar results. Fleece jacket production gave high amounts of emitted carbon dioxide due to its complex fabric structure and high fabric weight, while T-shirts gave the lowest amount of the fabrics tested.

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