ITZ microstructure of concrete containing GGBS

Gao, Jianming; Qian, Chunxiang; Liu, H.F.; Wang, B.; Li, L.

doi:10.1016/j.cemconres.2004.06.042

Cited by 159 publications

(47 citation statements)

References 1 publication

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“…For watercementitious material ratio (w/c) = 0.5 and aggregate/ cementitious material ratio (a/c) = 3, the slump was increased by 20, 35 and 55 % for 10, 30 and 50 % GGBS replacement, respectively. Similar improvement was reported elsewhere (Gao et al 2005) for the partial replacement of PC with GGBS. Figure 3 shows the compressive strength development for the control mix and the mixes with 10, 30 and 50 % GGBS replacement.…”

Section: Resultssupporting

confidence: 71%

Durability Properties and Microstructure of Ground Granulated Blast Furnace Slag Cement Concrete

Divsholi

Lim

Teng

2014

Int J Concr Struct Mater

143

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Ground granulated blast-furnace slag (GGBS) is a green construction material used to produce durable concrete. The secondary pozzolanic reactions can result in reduced pore connectivity; therefore, replacing partial amount of Portland cement (PC) with GGBS can significantly reduce the risk of sulfate attack, alkali-silica reactions and chloride penetration. However, it may also reduce the concrete resistance against carbonation. Due to the time consuming process of concrete carbonation, many researchers have used accelerated carbonation test to shorten the experimental time. However, there are always some uncertainties in the accelerated carbonation test results. Most importantly, the moisture content and moisture profile of the concrete before the carbonation test can significantly affect the test results. In this work, more than 200 samples with various water-cementitious material ratios and various replacement percentages of GGBS were cast. The compressive strength, electrical resistivity, chloride permeability and carbonation tests were conducted. The moisture loss and microstructure of concrete were studied. The partial replacement of PC with GGBS produced considerable improvement on various properties of concrete.

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Section: Resultssupporting

confidence: 71%

Durability Properties and Microstructure of Ground Granulated Blast Furnace Slag Cement Concrete

Divsholi

Lim

Teng

2014

Int J Concr Struct Mater

143

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“…In general, it can be assumed that the higher the amount of water suction exerted by the pores of a particular sample, the more susceptible it would be to degradation and hence the less durable it would be deemed. As it can be seen from figure 3, the 100% PC specimens showed the greatest increase (Gao et al 2005). This trend was not observed in the measurement of water absorption (on the contrary, the amount of water absorbed by the GGBS samples was lower than that absorbed by the PC samples), since water absorption is more dependent on total volume of pores rather than on the pore size distribution.…”

Section: Capillary Testmentioning

confidence: 68%

Study of the Durability of OPC versus GGBS Concrete on Exposure to Silage Effluent

Pavía

Condren

2008

J. Mater. Civ. Eng.

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Ordinary Portland cement (OPC) has been traditionally used in the construction of concrete silos in Ireland. However, the aggressive nature of the effluent produced by silage leads to severe degradation of the concrete. GGBS is a common addition to PC composites. It has been demonstrated that GGBS improves the general performance of PC concrete decreasing chloride diffusion and chloride ion permeability; reducing creep and drying shrinkage; increasing sulfate resistance; enhancing ultimate compressive strength and reducing heat of hydration and bleeding. It has also been suggested that GGBS may increase concrete durability in the aggressive environment of silos. In order to investigate this theory, a simulation study was carried out by immersing samples of mortars incorporating increasing amounts of GGBS in a silage effluent solution and a magnesium sulphate solution. Over the course of an experiment consisting of three, 28-day cycles of immersion in the silage effluent, the sample performance was evaluated by testing permeability, porosity, water absorption, capillary suction, compressive strength and mass loss. According to the results obtained, the OPC samples suffered the highest rise in permeability and porosity and the greatest loss in both mass and compressive strength. In addition, the durability of the mortars, when subjected to both salt crystallisation and silage effluent cycles, increased with increasing amounts of GGBS. The significant rise in capillary suction, water absorption and permeability over the course of the experiment indicates that the damage induced by the effluent is not as superficial as previously reported. Loss in mass and increase in permeability were found to be the most reliable indicators of corrosion as they gave the most dramatic and uniform results.

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“…GGBS and PFA vary from Ordinary Portland Cements, OPCs, in chemical composition, and potentially size range of particles; depending upon the processing these material experience during manufacture. The notable compositional differences being the quantities of calcium oxides, aluminium oxides and silica oxides oxides, (generally GGBS and PFA have increased levels of aluminium and silicon oxides and reduced quantities of calcium oxides when compared to OPC: Hill and Sharpe 2002;Escalante-Garcia and Sharpe 2004;Gao et al 2005) resulting in changes in the Si/Ca ratio and thus impacting upon the products formed during curing (Hill and Sharpe 2002;Escalante-Garcia and Sharpe 2004;Gao et al 2005). GGBS is considered a latent hydraulic binder (Hill and Sharpe 2002); the GGBS particles would experience curing reactions at both the outer surface and within the particles (also observed by Escalante-Garcia and Sharpe 2004).…”

Section: Curing Of the Cementitious Materialsmentioning

confidence: 99%

Deformation and Compression Behaviour of a Cement–Bentonite Slurry for Groundwater Control Applications

et al. 2017

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Cement bentonite (CB) barriers are selfsupporting, low permeability, structures used to retard groundwater flow and as such strength and hydraulic conductivity parameters are often stipulated when developing the mixtures. This paper reports an investigation into the deformation and compression behaviour of a CB containing ground granulated blastfurnace slag using the unconfined compressive strength apparatus, triaxial (undrained, unconsolidated) and oedometer. Samples were also exposed to drying and rewetting to investigate possible response to changes in environmental conditions. Cracking was observed prior to peak stress suggesting that the hydraulic conductivity of a barrier may be adversely affected before the shear strength is reached in undrained conditions. The compression response of CB indicates the presence of a threshold stress; once exceeded the magnitude of settlements are significantly greater than those encountered below this threshold. If a barrier experiences localised changes in loading conditions then there is the potential for damage from induced differential settlements; thus it is recommended that the threshold stress should also be considered at the design stage in addition to strength and hydraulic conductivity requirements. The response of the material exposed to drying-rewetting was unexpected and requires further investigation to determine how a barrier will respond to changing environmental conditions.

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ITZ microstructure of concrete containing GGBS

Cited by 159 publications

References 1 publication

Durability Properties and Microstructure of Ground Granulated Blast Furnace Slag Cement Concrete

Durability Properties and Microstructure of Ground Granulated Blast Furnace Slag Cement Concrete

Study of the Durability of OPC versus GGBS Concrete on Exposure to Silage Effluent

Deformation and Compression Behaviour of a Cement–Bentonite Slurry for Groundwater Control Applications

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