Structural behavior of alkali activated fly ash concrete. Part 2: structural testing and experimental findings

Yost, Joseph Robert; Radlińska, Aleksandra; Ernst, Stephen; Salera, Michael; Martignetti, Nicholas J.

doi:10.1617/s11527-012-9985-0

Cited by 82 publications

(35 citation statements)

References 2 publications

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“…The solid bond between binder and agregate at geopolymer concrete led to the brittle characteristic of its concrete, thus the crack pattern of the beams only occurs at mid span . This result is apropriate with previous research by Sumanjauw which is stated that geopolymer concrete has high compressive strength than ordinary concrete [8].…”

Section: Methodscontrasting

confidence: 93%

Flexural Test of Fly Ash based Geopolimer Concrete Beams

Umniati

Risdanareni

2017

MATEC Web Conf.

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Abstract. Fly ash is a by-product from the coal industry, which is widely available in Indonesia. Fly ash contains quite high silicate and alumina. Silica and alumina reacts with alkaline solution to produce alumina silicate gel which binds the aggregate to produce geopolymer concrete. Geopolymer concrete is introduced as an environmental concrete with high compressive strength. The use of geopolymer concrete beams is a solution to reduce the effects of greenhouse gases. This research uses experimental designs. The data are obtained from the testing of 4 pieces of reinforced geopolymer concrete beams and reinforced ordinary concrete beams with a / d of 1.11 and 2.24. The results are obtained from the maximum load that can be accepted by the beam. The results of this study are: (1) Geopolymer concrete cylinder has 26.78% higher compressive strength than ordinary concrete cylinders (2) Ordinary concrete beams can withstand 34.8% load higher compared to the geopolymer concrete beam (3) Reinforced ordinary concrete beams experience bending shear collapse while reinforced geopolymer concrete beam experience pure bending collapse.

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Section: Methodscontrasting

confidence: 93%

Flexural Test of Fly Ash based Geopolimer Concrete Beams

Umniati

Risdanareni

2017

MATEC Web Conf.

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“…The results revealed that the flexural behaviours of GC specimens were similar to those of conventional cement concrete in terms of the effect of the reinforcement ratio on flexural capacity and the ductility index. Other investigations [11][12][13][14][15] also reported analogous performances of both types of beams in bending tests, such as first cracking load, crack width, load-deflection relationship, flexural stiffness, ultimate load, and failure mode. It was also reported that the capacities computed from AS 3600 [10], ACI 2 Advances in Materials Science and Engineering 318 [16], and IS 456 [17] were more conservative than the experimental results [9,11,12].…”

Section: Introductionmentioning

confidence: 63%

“…The shear cracks initiated later but became wider and more intense than the flexural cracks, the latter indicating the pronounced deterioration in shear capacity. One GC specimen experienced shear failure, and the phenomenon did not fit the description in [12] that GC beams acquired an equal or higher shear capacity.…”

Section: Cracksmentioning

confidence: 85%

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Flexural Behaviour of Combined FA/GGBFS Geopolymer Concrete Beams after Exposure to Elevated Temperatures

Junru

Chen

Sun

et al. 2017

Advances in Materials Science and Engineering

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As a promising alternative to OPC concrete, geopolymer concrete has been investigated and has demonstrated superior mechanical performance. Studying the thermal behaviour on the scale of a structural element is significant for introducing a new material to engineering applications. Four geopolymer concrete beams and four OPC concrete counterparts with the same reinforcement structure and similar concrete strength were subjected to three different heating cases at the rate of ISO834. The experimental results showed that the geopolymer concrete beams underwent a colour change, severe cracking, and no spalling after the exposure. While under load, the geopolymer concrete specimens exhibited a lower crack resistance and flexural stiffness. The residual load capacities were 110%, 107%, and 90% of the ambient specimen for the geopolymer concrete samples and 103%, 97%, and 80% for the OPC concrete samples. To some extent, the geopolymer concrete beams achieved superior fire endurance compared to their OPC concrete counterparts.

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“…Since that time, there have been a number of studies of the engineering properties of concrete specimens (reinforced or unreinforced) based on solely fly ash-derived binders, including [48][49][50][51][52][53]. However, studies of durability-related properties such as [54,55] have highlighted the likely importance of inclusion of a calcium source in the mix designs as a way to control porosity and pore structure, and these more calcium-rich mixes currently appear to be the more likely way forward for applications in reinforced concretes [1].…”

Section: Revisiting the 2007 'State Of The Art' [34]mentioning

confidence: 99%

Milestones in the analysis of alkali-activated binders

Provis

Bernal

2014

Journal of Sustainable Cement-Based Materials

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The use of alkali activation to achieve environmental savings in the production of construction materials is currently an extremely active area of research and development. There is now a diverse range of chemistries and applications that have been developed within the broader theme of 'alkali-activated materials', including the subclass of lower-calcium binders which are also known as 'geopolymers'. Academic research and commercial development have combined to bring these materials to a level of technological maturity where larger-scale deployment is now taking place. This paper reviews some of the key aspects of alkali-activation technology which have brought the field to this point, with a particular view towards re-assessing key points and comments which have been raised in several historical reviews and discussions of this class of materials. Conclusions are therefore drawn regarding which among these key questions have been answered, and which remain outstanding in an engineering or scientific sense.

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Structural behavior of alkali activated fly ash concrete. Part 2: structural testing and experimental findings

Cited by 82 publications

References 2 publications

Flexural Test of Fly Ash based Geopolimer Concrete Beams

Flexural Test of Fly Ash based Geopolimer Concrete Beams

Flexural Behaviour of Combined FA/GGBFS Geopolymer Concrete Beams after Exposure to Elevated Temperatures

Milestones in the analysis of alkali-activated binders

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