Flexural strength and elastic modulus of ambient-cured blended low-calcium fly ash geopolymer concrete

Nath, Pradip; Sarker, Prabir Kumar

doi:10.1016/j.conbuildmat.2016.11.034

Cited by 381 publications

(172 citation statements)

References 31 publications

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“…The results show that at the same strength class R3 OPC and R3 CSA obtain E d values 35% higher than that of R3 GEO. The low stiffness of the geopolymeric mortar is in accordance with the literature [58][59][60][61][62][63][64]. A lower stiffness means lower induced tensions at a certain deformation and, therefore, a lower probability of cracking caused by tensile (or shear) stresses or expansive reactions.…”

Section: Microstructural Analyses Of Mortarssupporting

confidence: 71%

Calcium Sulfoaluminate, Geopolymeric, and Cementitious Mortars for Structural Applications

et al. 2017

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This paper deals with the study of calcium sulfoaluminate (CSA) and geopolymeric (GEO) binders as alternatives to ordinary Portland cement (OPC) for the production of more environmentally-friendly construction materials. For this reason, three types of mortar with the same mechanical strength class (R3 ≥ 25 MPa, according to EN 1504-3) were tested and compared; they were based on CSA cement, an alkaline activated coal fly ash, and OPC. Firstly, binder pastes were prepared and their hydration was studied by means of X-ray diffraction (XRD) and differential thermal-thermogravimetric (DT-TG) analyses. Afterwards, mortars were compared in terms of workability, dynamic modulus of elasticity, adhesion to red clay bricks, free and restrained drying shrinkage, water vapor permeability, capillary water absorption, and resistance to sulfate attack. DT-TG and XRD analyses evidenced the main reactive phases of the investigated binders involved in the hydration reactions. Moreover, the sulfoaluminate mortar showed the smallest free shrinkage and the highest restrained shrinkage, mainly due to its high dynamic modulus of elasticity. The pore size distribution of geopolymeric mortar was responsible for the lowest capillary water absorption at short times and for the highest permeability to water vapor and the greatest resistance to sulfate attack.

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Section: Microstructural Analyses Of Mortarssupporting

confidence: 71%

Calcium Sulfoaluminate, Geopolymeric, and Cementitious Mortars for Structural Applications

et al. 2017

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“…e modulus of elasticity obtained from this study agrees with Nath and Sarker [51] that the modulus of elasticity of geopolymer concrete with 28-day compressive strength of 25-45 MPa was between 17.4 and 24.6 GPa, while the modulus of elasticity of Portland cement concrete was between 25 and 35 GPa [51,52]. According to Figure 10 …”

Section: Resultssupporting

confidence: 79%

A Mix Design Procedure for Alkali‐Activated High‐Calcium Fly Ash Concrete Cured at Ambient Temperature

Phoo-ngernkham

Phiangphimai

Damrongwiriyanupap

et al. 2018

Advances in Materials Science and Engineering

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is research focuses on developing a mix design methodology for alkali-activated high-calcium fly ash concrete (AAHFAC). High-calcium fly ash (FA) from the Mae Moh power plant in northern ailand was used as a starting material. Sodium hydroxide and sodium silicate were used as alkaline activator solutions (AAS). Many parameters, namely, NaOH concentration, alkaline activator solution-to-fly ash (AAS/FA) ratio, and coarse aggregate size, were investigated. e 28-day compressive strength was tested to validate the mix design proposed. e mix design methodology of the proposed AAHFAC mixes was given step by step, and it was modified from ACI standards. Test results showed that the 28-day compressive strength of 15-35 MPa was obtained. After modifying mix design of the AAHFAC mixes by updating the AAS/FA ratio from laboratory experiments, it was found that they met the strength requirement.

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“…The modulus of elasticity is closely related to compressive strength. Some experimental values and predictive formulas have been given in previous studies on geopolymer [39][40][41][42]. Most of the results were acquired from experiments with heat-cured geopolymer concrete.…”

Section: Elasticity Modulusmentioning

confidence: 99%

“…E c = 2707 × f c + 5300 (8) In another article [40], Nath and Sarker put forward Equation (9) to predict the elastic modulus of geopolymer concrete cured at room temperature.…”

Section: Elasticity Modulusmentioning

confidence: 99%

“…The formulas of ACI 318-14 and CEB-FIP code are intended for original Portland concrete (OPC). The equations in references [40,42,46], are applicable to estimate geopolymer concrete cured at elevated temperature or in ambient condition. Moreover, some studies [41,47] have reported that the elastic modulus of OPC is slightly higher than geopolymer concrete.…”

Section: Elasticity Modulusmentioning

confidence: 99%

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Influence of Water Content on Mechanical Strength and Microstructure of Alkali-Activated Fly Ash/GGBFS Mortars Cured at Cold and Polar Regions

Xiang

Feng

et al. 2019

Materials

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Negative temperature curing is a very harmful factor for geopolymer mortar or concrete, which will decrease the strength and durability. The water in the geopolymer mixture may be frozen into ice, and the water content is a crucial factor. The purpose of this paper is to explore the influence of water content on the properties of alkali-activated binders mortar cured at −5 • C. Fly ash (FA) and ground granulated blast furnace slag (GGBFS) were used as binders. Three groups of experiments with different water content were carried out. The prepared samples were investigated through uniaxial compression strength test, Scanning electron microscopy (SEM), and X-ray diffraction (XRD) for the determination of their compressive strength, microstructural features, phase, and composition. The results indicated that, the compressive strength of samples basically maintained 25.78 MPa at an age of 28 days; for 90 days, the values reached 33.4 MPa-34.04 MPa. The results showed that lower water content is beneficial to improving the early strength of mortar at −5 • C curing condition, while it has little impact on long-term strength. These results may provide references for the design and construction of geopolymer concrete in cold regions.However, most previous studies about the alkali-activated fly ash/GGBFS mortar and concrete were carried out by curing samples at elevated temperature or in ambient curing condition [13]. Many researchers believed that addition of GGBFS can significantly improve early and later age mechanical strength of fly ash based geopolymer concrete cured at room temperature [14,15]. Up to now, the research on the physical and mechanical properties of geopolymer concrete curing at negative temperature has not been reported.With the social development, cleaner and energy-saving building materials are needed in cold and polar regions of the world. For example, Figure 1 shows the mean annual air temperature distribution of China in 2015 [16], and the temperature in most areas is lower than 0 • C, however, many infrastructures were built in these areas, such as Qinghai-Tibet railway, Sichuan-Lasa Expressway, and Harbin Dalian high speed railway. These projects only have a very short construction period of positive temperature (above 0 • C) every year, which will extend the entire construction period and increase the cost. If the in-situ casting geopolymer concrete with better performance can be obtained under the condition of negative temperature curing, the construction period will be shortened and the cost will be saved. Materials 2019, 12, x FOR PEER REVIEW 2 of 16building materials, fire-retardant coatings, fiber-reinforced composite materials, and fixed solutions for chemical and nuclear industrial wastes. However, most previous studies about the alkali-activated fly ash/GGBFS mortar and concrete were carried out by curing samples at elevated temperature or in ambient curing condition [13]. Many researchers believed that addition of GGBFS can significantly improve early and later age mechanical strengt...

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Flexural strength and elastic modulus of ambient-cured blended low-calcium fly ash geopolymer concrete

Cited by 381 publications

References 31 publications

Calcium Sulfoaluminate, Geopolymeric, and Cementitious Mortars for Structural Applications

Calcium Sulfoaluminate, Geopolymeric, and Cementitious Mortars for Structural Applications

A Mix Design Procedure for Alkali‐Activated High‐Calcium Fly Ash Concrete Cured at Ambient Temperature

Influence of Water Content on Mechanical Strength and Microstructure of Alkali-Activated Fly Ash/GGBFS Mortars Cured at Cold and Polar Regions

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