Stress–strain behaviour of confined Geopolymer concrete

Ganesan, N.; Abraham, Ruby; Raj, Shubham; Sasi, Divya

doi:10.1016/j.conbuildmat.2014.09.092

Cited by 54 publications

(28 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, a more brittle response in mechanical behaviour of GPC than OPC was observed in the experimental tests [11][12][13]. Most studies investigating the compressive stress-strain behaviour of GPC also reported significant differences between GPC and OPC [10,14,15].…”

Section: Introductionmentioning

confidence: 92%

Rectangular Stress-block Parameters for Fly-ash and Slag Based Geopolymer Concrete

Tran

Pham

2019

Structures

View full text Add to dashboard Cite

Although there has been a numerous quantity of studies investigating the mechanical properties of geopolymer concrete (GPC), parameters for designing GPC structures are still not systematically investigated and carefully justified. ACI rectangular stress-block parameters is able to predict well the strength of conventional concrete structures but their applicability for GPC is questionable. This study aims to establish new sets of rectangular stress-block parameters for GPC with a broad range of the compressive strength up to 66 MPa. The proposed rectangular stress-block parameters in this study are based on two analytical concrete stress-strain models and measured curves from previous studies of GPC materials. The results from this study show that the use of ACI recommendations for concrete structure in designing GPC beams is still acceptable with high accuracy. However, the axial load-carrying capacity of GPC columns computed by ACI parameters deviate significantly from the experimental results while the proposed parameters provide a good correlation with these experimental data. The significant difference is mainly due to the modification of k 3 , which is the ratio of concrete strength in real structures to standard cylinder samples. This study suggests that the assumption of k 3 =0.9 in previous studies for conventional Portland concrete is not suitable for use in deriving the stress-block parameters of GPC. In some cases, this ratio should be reduced to 0.7 depending on the curing condition.

show abstract

Section: Introductionmentioning

confidence: 92%

Rectangular Stress-block Parameters for Fly-ash and Slag Based Geopolymer Concrete

Tran

Pham

2019

Structures

View full text Add to dashboard Cite

show abstract

“…Beside this, the sustainable performance of Portland cement is another major limitations 4 . Recently, geopolymers have been investigated extensively as an alternative binder with a view to producing green, durable and sustainable concretes 5,6 . Various alternative cementitious materials (like fly ash, slag, metakaoline and others) are found to have potential application to resolve the durability aspects of cement concrete 7 .…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Mechanical and Microstructural Properties of Silica Fume Blended Fly Ash Based Geopolymer Using Murram as a Tertiary Supplement

Dutta¹,

Ghosh²

2018

RJC

View full text Add to dashboard Cite

The present study aims to investigate the compressive strength and the underlying micro-structural change of fly ash geopolymer paste with silica fume and murram as supplements up to 10% and 2.5% of the total weight respectively. The workability property of the geopolymer paste samples was evaluated at a green state using a unique methodology based on the polar graph. Besides, various geopolymer paste samples were subjected to heat curing at different temperatures and also for different durations to find the influence of heat curing to the obtained compressive strengths. The present study also probed into the underlying micro-structural changes of the corresponding geopolymer paste samples through SEM (Scanning Electron Microscopy), MIP (Mercury Intrusion Porosimetry) and EDX (Energy Dispersive X-Ray Analysis). Through the present analysis, it can be concluded that blending of silica fume and murram with fly ash based geopolymer paste results in a sustainable high performance binder even at lower alkalinity with lower heat consumption as well as lower water content which can be considered as a better alternative of cement concrete binder to march towards environmental sustainability.

show abstract

“…From this figure, it could be seen that with a similar geometry and reinforcement arrangement, the GPC columns had a softer elastic range. The post peak response of the GPC column was also more brittle, similar to G150-C. 321 Therefore, sufficient transverse reinforcement must be provided for GPC columns, due to its lower 322 elastic modulus than OPC concrete [3]. It was concluded that model was suitable for modelling the behaviour of the concentrically or eccentrically loaded GFRP-reinforced GPC columns.…”

Section: Gfrp-reinforced Opc Concrete Columnsmentioning

confidence: 99%

“…The improved chemical stability means that the GPC will continuously provide protection to the embedded reinforcement, extending the service life of the structure. Due to the difference in microstructure, GPC has a lower elastic modulus than OPC concrete [3].…”

Section: Introductionmentioning

confidence: 99%

Modelling glass fibre-reinforced polymer reinforced geopolymer concrete columns

et al. 2019

View full text Add to dashboard Cite

Glass fibre-reinforced polymer (GFRP) bar and stirrup reinforced geopolymer concrete (GPC) is increasingly recognised as a potential replacement to the conventional steel-reinforced ordinary Portland cement (OPC) concrete due to its superior durability. This paper proposed an analytical model to predict the load-displacement relationship of the concentrically and eccentrically loaded GFRP-GPC columns. The cross-section was divided into a number of strips and a strain gradient was assigned to determine the stresses in the cover, core and reinforcement. The theoretical predictions were then validated using experimental results from previous studies on the behaviour of GFRP-GPC, GFRP-OPC concrete and steel-GFRP concrete systems. It was found that the predicted peaks load, displacements at peak load and ductility indices were generally in close agreement with the experimental results of the GFRP-GPC columns. However, the model had a tendency to over-predict the stiffness of GFRP-OPC concrete and steel-OPC concrete columns in the elastic range. Overall, the proposed analytical model is suitable for GFRP-GPC systems and could facilitate the widespread use of this composite material.

show abstract

Stress–strain behaviour of confined Geopolymer concrete

Cited by 54 publications

References 5 publications

Rectangular Stress-block Parameters for Fly-ash and Slag Based Geopolymer Concrete

Rectangular Stress-block Parameters for Fly-ash and Slag Based Geopolymer Concrete

Enhancing the Mechanical and Microstructural Properties of Silica Fume Blended Fly Ash Based Geopolymer Using Murram as a Tertiary Supplement

Modelling glass fibre-reinforced polymer reinforced geopolymer concrete columns

Contact Info

Product

Resources

About