Ageing coefficient for early age tensile creep of blended slag and low calcium fly ash geopolymer concrete

Cheng, Zhengqing; Zhao, Renda; Yuan, Yuan; Li, Fuhai; Castel, Arnaud; Xu, Tong

doi:10.1016/j.conbuildmat.2020.119855

Cited by 41 publications

(16 citation statements)

References 28 publications

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“…The study used a solution of 3.5% alkaline sodium silicate, 20% water, and 4% sodium silicate which produced the highest compressive strength reaching 75 MPa [5]. However, in the end, the commonly used activator is sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) with a concentration of 8M to 14M with a ratio of sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) between 0.4 to 2.5 [6]. Using 8 and 10 molar sodium hydroxide (NaOH) solutions with a ratio of sodium silicate and sodium hydroxide of 0.5; 1.0; 1.5; 2.0; 2.5.…”

Section: Introductionmentioning

confidence: 99%

Effect of Treatment Age on Mechanical Properties of Geopolymer Concrete

Ningrum¹,

Wijaya²,

Van³

2023

ajse

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There are the same compound content, fly ash does not have the ability to bind, so it requires an alkaline activator for the polymerization reaction or binding reaction to occur. The alkali activators commonly used are sodium hydroxide and sodium silicate. The use of these materials makes concrete with fly ash known as geopolymer concrete. Geopolymer concrete is an alternative to conventional concrete, so it must have optimal strength like conventional concrete, therefore researchers are interested in testing the value of compressive strength, split tensile strength and mode of elasticity of geopolymer concrete using 10 molar alkali activator with a ratio of 3:2. for variations in the age of concrete 7, 14, 21, and 28 days; and the conversion value of geopolymer concrete using 10 molar alkali activator with a ratio of 3:2 for variations in the age of concrete 7, 14, 21, and 28 days. This research is an experimental study using variations in the age of concrete 7, 14, 21, and 28 days for geopolymer concrete using 10 molar alkali activator with a ratio of 3:2. The results of this study indicate that there is an effect of variations in the age of concrete on the value of compressive strength, split tensile strength, and modulus of elasticity of geopolymer concrete. Where the compressive strength, split tensile strength, and modulus of elasticity of geopolymer concrete at the age of 7 days are 31.40%; 35.44%; and 23.32% which at the age variation of 28 days increased by 100%. In addition, in this study, it is known that the conversion value at the age of 28 days for variations in the age of 7 days, 14 days, 21 days, and 28 days, respectively, is 0.31; 0.73; 0.97; 1.00 Keywords: Geopolymer Concrete, Compressive Strength, Modulus of Elasticity

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Section: Introductionmentioning

confidence: 99%

Effect of Treatment Age on Mechanical Properties of Geopolymer Concrete

Ningrum¹,

Wijaya²,

Van³

2023

ajse

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“…The usage of thermal energy for the production of sodium silicate requires a temperature of 1100 °C, which is 350 °C lower than that needed for the making of OPC. Geopolymer concrete is considered as a possible alternative to OPC concrete [ 10 ]. Unlike normal concrete, the matrix formation and strength development of geopolymer concrete do not need calcium silicate hydrate (C-S-H) gel to be form [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Durability Performance of Geopolymer Concrete: A Review

Wong

2022

Polymers

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Geopolymer concrete is produced from the geopolymerization process, in which molecules known as oligomers integrate to form geopolymer networks with covalent bonding. Its production expends less thermal energy and results in a smaller carbon footprint compared to Ordinary Portland Cement (OPC) concrete. It requires only an alkaline activator to catalyze its aluminosilicate sources such as metakaolin and fly ash, to yield geopolymer binder for the geopolymerization to take place. Because of its eco-friendly technology and practical application, current research interest is mainly concentrated on the endurance of geopolymer concrete to resist heat and chemical aggressions. As such, it is pertinent for this review article to provide critical insight into the recent progress in research on the durability of geopolymer concrete. One significant outcome of the review is that the admixture of geopolymer concrete could be blended with additives such as micro-silica and fibers such as polypropylene fibers, to enhance its durability. The review on the durability aspects of geopolymer concrete showed that it had high compressive strength at an optimal elevated temperature, low to medium chloride ion penetrability, and high resistance to acid attack and abrasion. This makes geopolymer concrete a viable candidate to replace OPC concrete in the construction industry.

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“…In addition, the accurate acquisition and prediction of the elastic modulus of concrete was also a research focus, especially for modern high-performance concrete structures with early loading for rapid construction. The prediction method of the concrete elastic modulus was mainly the effective modulus [ 27 ], age-adjusted effective modulus [ 28 ] and the Trost–Bazant method [ 29 ]. The effective modulus method was reported to be only suitable for non-ageing concrete subjected to constant stress history; therefore, it has rather limited applicability in practice [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

“…The prediction method of the concrete elastic modulus was mainly the effective modulus [ 27 ], age-adjusted effective modulus [ 28 ] and the Trost–Bazant method [ 29 ]. The effective modulus method was reported to be only suitable for non-ageing concrete subjected to constant stress history; therefore, it has rather limited applicability in practice [ 27 ]. The age-adjusted and Trost–Bazant model parameters were calibrated by tests on mature concrete, thus the suitability of the above models for predicting tensile creep was questioned early on when concrete properties changed rapidly with time [ 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

Concrete Elastic Modulus Experimental Research Based on Theory of Capillary Tension

Zhou

et al. 2022

Materials

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The risk of cracking in the early stage is a critical indicator of the performance of concrete structures. Concrete cracked when the tensile stresses caused by deformation under restraint conditions exceeded its tensile strength. This research aims at an accurate prediction of shrinkage cracking of concrete under constraints. Based on the theory of capillary tension under the concrete shrinkage mechanism, the method to test and compute the elastic modulus of a micro-matrix around the capillary, Et, was derived. Shrinkage and porosity determination tests were conducted to obtain the shrinkage values and confining stresses of concrete at different strength grades, different ages and under different restraint conditions, accordingly. Meanwhile, the proposed method of this research was used to obtain Et. The restraint stress given by Et was compared with the experimental result under the corresponding time. The results suggested a positive correlation between the elastic modulus of a micro-matrix around the capillary, Et, precomputed by the theory, and the static elastic modulus, Ec, and that the ratio between the two gradually decreased with the passage of time, which ranged from 2.8 to 3.1.

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Ageing coefficient for early age tensile creep of blended slag and low calcium fly ash geopolymer concrete

Cited by 41 publications

References 28 publications

Effect of Treatment Age on Mechanical Properties of Geopolymer Concrete

Effect of Treatment Age on Mechanical Properties of Geopolymer Concrete

Durability Performance of Geopolymer Concrete: A Review

Concrete Elastic Modulus Experimental Research Based on Theory of Capillary Tension

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