Effect of free lime content on properties of cement–fly ash mixtures

Kaewmanee, Krittiya; Krammart, Pitisan; Sumranwanich, Taweechai; Choktaweekarn, Pongsak; Tangtermsirikul, Somnuk

doi:10.1016/j.conbuildmat.2012.09.035

Cited by 47 publications

(31 citation statements)

References 3 publications

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“…The concretes with dry Fly Ashes 4 and 5, Figure 4, also gave little difference in carbonation compared to Fly Ash 2. These agree with earlier research on carbonation using dry fly ash in concrete for the effect of (i) free lime content [53] and (ii) varying fineness and LOI at equal strength [26,32].…”

Section: Carbonation Ratessupporting

confidence: 92%

“…(b) for35 MPa concrete compared to Fly Ash 2, which could reflect the reduced mineral component in this material. For concrete with dry Fly Ash 5 (high free lime), reductions were obtained compared to Fly Ash 2, which is different to another study where this had little effect on chloride resistance[53]. The results of Fly Ash 2 and 5 concretes, however, both agree with the transportation properties in terms of ranking.…”

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confidence: 76%

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Corrosion of reinforcement in concrete containing wet-stored fly ash

McCarthy

Tittle

Dhir

2019

Cement and Concrete Composites

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The study described was concerned with moistened fly ash as a cement component in concrete and its influence on carbonation and chloride-induced corrosion. Five laboratory-moistened fly ashes (10% by mass) and samples from two power station stockpiles (moistened at 10 to 30% by mass) were examined, with several material/storage variables investigated. Initial tests quantified moisture effects, which indicate agglomeration of fly ash and a tendency for this to increase with free lime content, storage period and temperature. Concretes were compared at equal slump (75 mm) and 28 day (cube) strength. Air (intrinsic) permeability and water absorption were slightly greater (high free lime, 0.9%), or lower (low free lime < 0.1%) with moistened fly ash in concrete (compared to that with dry material), and where there were benefits, these increased with longer storage. For carbonation and chloride diffusion, moistening of low free lime fly ash gave similar or slightly enhanced results. In the case of high free lime fly ash, wet-storage gave increased chloride diffusion. This seemed to be due to the effects that higher free lime content has on wet fly ash (increased agglomeration, reduced fineness/reactivity) and their influences on the durability process. Carbonation tended to reduce with low storage temperature, while chloride diffusion gave little change. Reinforcement corrosion associated with these was similar between dry and moistened low free lime fly ash concretes. While paste experiments suggest some differences in chemistry between dry and wet-stored fly ash systems and their response to carbon dioxide and chloride exposures, these didn't seem to have a noticeable effect on concrete resistance to the processes.

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Section: Carbonation Ratessupporting

confidence: 92%

contrasting

confidence: 76%

Corrosion of reinforcement in concrete containing wet-stored fly ash

McCarthy

Tittle

Dhir

2019

Cement and Concrete Composites

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“…The range of lime content (CaO) in SCBA is 4.01% to 10.5% which is higher compared to POFA where it contain CaO in the range of 4.92% to 6.4% [12]. According to Kaewmanee et al [13], lime is important to early setting and contribute to a higher compressive strength, especially in early ages of concrete. Aprianti [12] found that OPC also contained high CaO content in range of around 61.50% to 65.4%.…”

Section: Compatibility Of the Mixture Of Pofa And Scba To Replace Cementmentioning

confidence: 99%

“…SO 3 is important because it may cause expansion which compensates shrinkage. The mixture with higher SO 3 content would results in lesser shrinkage [13].…”

Section: Introductionmentioning

confidence: 99%

Potential Mixture of POFA and SCBA as Cement Replacement in Concrete – A Review

et al. 2017

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Concrete is an important material used in all kind of building construction and ordinary Portland cement (OPC) is one of an important element in the production of concrete. However, the production of cement causes a problem because of high CO 2 emission to atmosphere. The manufacture of 1 tonnes of cement would produce approximately released 1 tonnes of CO 2. So, the need to search another material that can replace a cement with same properties and environmental friendly are crucial. The suitable material to replace cement has to be a pozzolanic materials. This is because pozzolanic materials has cementitious properties and high silica content. Palm oil fuel ash (POFA) and sugarcane bagasse ash (SCBA) are the material that suitable to replace cement because of high silica content. The use of POFA and SCBA in concrete has been studied by many researcher and it has been proved to improve the mechanical strength of the concrete either in normal concrete, high strength concrete or lightweight concrete. This paper would discuss the overview of the previous study on the cement replacement by POFA and SCBA and the potential of the both materials to be mix together to improve its properties. The chemical element which will be the focus point is SiO 4 , MgO, CaO and SO 3 , while the physical and mechanical properties such as workability, specific gravity, compressive strength and tensile strength will also be reviewed.

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“…Fly ash-doped porous concrete (FAPC) is prepared based on conventional PC, which by adding certain proportion of fly ash into PC prepare material, and hope to improve the wastewater treatment effect. Fly ash is a waste material generated from electric power plants [18]. Approximately 500 million tons of fly ash is discharged per year throughout the world [19].…”

Section: Introductionmentioning

confidence: 99%

Treatment of Simulated Acid Mine Drainage with Fly Ash-Doped Porous Concrete

Cai²,

Xu³

2013

Proceedings of the 2013 International Conference on Remote Sensing,Environment and Transportation Engineering

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Abstract-The aim of this paper was to demonstrate the technical feasibility of AMD treatment using fly ash-doped porous concrete (FAPC). The FAPC were prepared through adding the fly ash into the ordinary porous concretes (PC), and the acid mine drainage (AMD) was treated by FAPC in this paper. The results show that: At influent pH of 2.9-3.4 and 24 h hydraulic retention time, the acidity of AMD was improved significant by FAPC, and which the pH of effluent was maintained at 8-9. The average removal rate of turbidity, COD and TP of AMD were 69.7%, 75.4% and 91.9%, respectively. Compared to none fly ash-doped porous concrete that the FAPC improved the AMD purification effect, for turbidity, COD and TP the average removal rate were increased of 13.6%, 10.0% and 1.9%, respectively. The experimental results also show that, the porosity of all FAPC was decreased after the AMD treated, but all in less than 10% and which does not affect the use of FAPC in AMD treatment. In view of the purification effect of FAPC, it provides a new way of AMD treatment and resources.Index Terms-porous concrete, fly ash, acid mine drainage, pH.

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Effect of free lime content on properties of cement–fly ash mixtures

Cited by 47 publications

References 3 publications

Corrosion of reinforcement in concrete containing wet-stored fly ash

Corrosion of reinforcement in concrete containing wet-stored fly ash

Potential Mixture of POFA and SCBA as Cement Replacement in Concrete – A Review

Treatment of Simulated Acid Mine Drainage with Fly Ash-Doped Porous Concrete

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