Performance evaluation of cement stabilized fly ash–GBFS mixes as a highway construction material

Singh, Suresh Prasad; Tripathy, Debi Prasad; Ranjith, P.G.

doi:10.1016/j.wasman.2007.09.017

Cited by 95 publications

(32 citation statements)

References 4 publications

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“…GGBS, with an annual production of about 15 Mt, is mainly used in concrete manufacturing plants for partial replacement of cement in concrete. However, this utilisation rate for GGBS only amounts to 55% (Singh et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…They found that by properly considering the design and construction processes, fly/bottom ash mixtures can be effectively utilised as pavement materials. In a recent study, Singh et al (2008) tested the effectiveness of cementstabilised fly ash-granulated blast-furnace slag (GBFS) mixtures for use in geotechnical applications. They showed that the California bearing ratio values and the UCS of the fly ash-GBFS mixtures increase enormously with an increase in the small percentage of cement and the mixtures can be effectively used in highway construction.…”

Section: Introductionmentioning

confidence: 99%

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Strength development in fly ash and slag mixtures with lime

Sharma

Sivapullaiah

2016

Proceedings of the Institution of Civil Engineers - Ground Impr

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2The main objective of this paper is to investigate the effect of the joint activation of fly ash, a by-product of thermal power plants, and ground granulated blast-furnace slag, a by-product of steel manufacture, on the unconfined compressive strength of mixtures of the two materials. Laboratory compaction and strength tests were carried out on ash-slag mixtures at different proportions. The strength was found to increase with slag content. However, the specimens consisting of 30 and 40% of slag and cured for 28 d showed higher strength than the individual materials.Additionally, the effect of different percentages of lime on the strength of the fly ash-slag mixtures was investigated.Tremendous increase in strength was observed with the addition of even 2% of lime. Scanning electron microscopy and X-ray diffraction studies showed the morphological and mineralogical changes that are associated with strength improvement. This study suggests that properly designed combinations of fly ash-slag-lime can be used as construction materials for infrastructure projects such as structural fills or subgrade and sub-base courses in pavements without requiring large quantities of lime.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strength development in fly ash and slag mixtures with lime

Sharma

Sivapullaiah

2016

Proceedings of the Institution of Civil Engineers - Ground Impr

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“…In the Netherlands, blast furnace slags are used as a self-cementing road base material on a wide scale for many decades [21]. Singh et al [22] carried out investigations on cement-stabilized fly ash-granulated blast furnace slag mixes in order to evaluate its performance for road embankments and for base and subbase courses of highway pavements. ey confirmed its suitability for use in base and subbase courses in highway pavements with proper combinations of raw materials.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Cement‐Stabilized Oil Shale Semicoke as Base or Subbase Course Construction Material

Tan

Zhu

Gong

et al. 2018

Advances in Materials Science and Engineering

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Oil shale semicoke is a hazardous byproduct in oil shale retorting process. In Jilin province, China, abundant oil shale resources are mainly used for retorting shale oil accompanying with a large number of oil shale semicoke slags, which will generally cause environmental pollution and disposal problems. If oil shale semicoke can be utilized as a road base or subbase course construction material, it will be a great help to the disposal of a long-term accumulated oil shale semicoke in landfill sites. Moreover, the resource treatment of oil shale semicoke in road project construction could obtain positive social and economic benefits. Subsequently, we conducted a series of laboratory tests to study the practicability of cement-stabilized oil shale semicoke as a road base or subbase course construction material, including the raw material test, modified compaction test, unconfined compressive strength (UCS) test, splitting tensile strength (STS) test, compressive resilient modulus (CRM) test, and freezing-thawing test. In this paper, test results were compared with the technical requirements of Chinese road base construction specification, preliminarily confirming that cement-stabilized oil shale semicoke can be used as a subbase course material of a highway or a base course material of a low-grade highway.

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“…One of the major issues with existing OPC-based oil well cement is cement degradation in CO 2 -rich environments, leading to increased porosity and permeability, and reduced mechanical strength (Barlet-Gouédard 2007;Liteanu et al 2009). On the other hand, researchers have found that geopolymer cement possesses excellent acidresistant characteristics, shows higher mechanical strength and durability, demonstrates lower permeability, experiences little shrinkage, has lower production cost, and possesses higher pump ability compared to OPC (Van Jaarsveld et al 1997;Nasvi et al 2013;Singh et al 2008). Geopolymer is an alumina-silicate cementitious material, which can be synthesized by mixing source material (fly ash, metakaolin, slag, etc.)…”

Section: Introductionmentioning

confidence: 99%

Geopolymer as well cement and its mechanical integrity under deep down-hole stress conditions: application for carbon capture and storage wells

Nasvi

Rathnaweera

Padmanabhan

2016

Geomech. Geophys. Geo-energ. Geo-resour.

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With regard to the safety, environmental impact and sustainability of carbon capture and storage (CCS) projects, the integrity of injection and production wells plays a major role. In a CCS project, mechanical integrity of well cement should be maintained to sustain the required mechanical strength throughout the life of an oil/gas and CO 2 sequestration well. One of the major issues with existing Portland cement based oil well cement is cement degradation in CO 2 -rich environment. On the other hand, geopolymer cement possesses excellent acid resistant characteristics, shows higher mechanical strength and durability and demonstrates lower permeability. Therefore, this research work focused on studying the mechanical integrity of geopolymers under two different down-hole conditions: (1) effect of CO 2 on mechanical behaviour of geopolymers and (2) hydraulic fracturing of geopolymers to study the mechanical integrity under down-hole stress conditions. To study the mechanical integrity under CO 2 rich environment, geopolymers were tested in CO 2 chamber at a pressure of 3 MPa for up to 6 months and compressive strength and microstructural testings were conducted. It was noted that strength values of geopolymers did not change significantly in CO 2 environment for 6 months. There were only about 2 % variations in compressive strength values in CO 2 compared to the initial strength value. Scanning electron microscopy (SEM) test results revealed that there is no significance variation in the microstructure of geopolymer after 6 months in CO 2 . For hydraulic fracturing experiment, four different tests were conducted with various injection pressure (P in ), axial stress (r 1 ), confining pressure (r 3 ) and tube length (30 and 40 mm). Geopolymers could not be fractured in any of the four tests, in which maximum values of P in of 23 MPa and r 1 of 59 MPa were used. There was no fracture development in geopolymers despite maximum ratios of P in /r 3 of 3.8 and r 1 /r 3 of 13.3 was tested. Tests could not be repeated with higher ratios of P in /r 3 and r 1 /r 3 due to the limitation with the triaxial set-up used. Since there is no fracture development in geopolymers at higher ratios of P in / r 3 and r 1 /r 3 , it is concluded that required mechanical integrity can be observed when geopolymers are used as well cement.

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Performance evaluation of cement stabilized fly ash–GBFS mixes as a highway construction material

Cited by 95 publications

References 4 publications

Strength development in fly ash and slag mixtures with lime

Strength development in fly ash and slag mixtures with lime

Performance Evaluation of Cement‐Stabilized Oil Shale Semicoke as Base or Subbase Course Construction Material

Geopolymer as well cement and its mechanical integrity under deep down-hole stress conditions: application for carbon capture and storage wells

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