Effects of nano and micro size of CaO and MgO, nano-clay and expanded perlite aggregate on the autogenous shrinkage of mortar

Polat, Rıza; Demirboğa, Ramazan; Khushefati, Waleed H.

doi:10.1016/j.conbuildmat.2015.02.032

Cited by 120 publications

(49 citation statements)

References 41 publications

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“…On the other hand, the expansion potential of the ash could be advantageously used to mitigate autogenous shrinkage problems of high-performance cement-based materials made with very low water to binder ratios. Autogenous shrinkage induced by self-desiccation due to chemical shrinkage 29 can be compensated by expansive additives 30 . When restrained, the shrinkage-induced internal stresses may cause cracks, which impair the durability of the cement-based materials.…”

Section: Soundnessmentioning

confidence: 99%

Reuse of Woody Biomass Ash Waste in Cementitious Materials

Ukrainczyk

Vrbos

Koenders

2016

Chem.Biochem.Eng.Q.

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There is an increased interest in the reuse of ash waste from biomass combustion, being a sustainable source of energy. This paper investigates the partial replacement of cement and sand in building materials with fly ash waste generated from combustion of woody biomass waste. The results show that the ash widens the particle size distribution of cement and has minerals complementary to portland cement, thus justifying its application as cement replacement, but with a relatively high amount of free CaO and MgO that may exert significant expansion. With ash addition, the rate of hydration, strength, and workability decreased. The optimum dosage showed 15 % of ash, replacing 5 % of cement and 3.33 % of sand, which can still produce a structural grade cementitious material with acceptable workability and mechanical properties. The ash exhibits hydraulic and pozzolanic activity that initially increases and subsequently decreases the amount of Ca(OH) 2 in the hydrated material.

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Section: Soundnessmentioning

confidence: 99%

Reuse of Woody Biomass Ash Waste in Cementitious Materials

Ukrainczyk

Vrbos

Koenders

2016

Chem.Biochem.Eng.Q.

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“…However, the system contained 4.5 wt. % nanoclay revealed 1.5 % increased shrinkage compared to control system (Polat et al, 2015). At lower concentrations of nanoclay, internal curing might be the dominant mechanism, but at higher concentrations other mechanisms like pore filling/pore refinement (Sadrmomtazi and Fasihi, 2012) and nucleation (Camiletti et al, 2013;Jayapalan et al, 2010) could be dominant.…”

Section: Internal Curingmentioning

confidence: 98%

“…5 that micro-CaO and nano-MgO presented almost the same effect on the reduction of autogenous shrinkage at testing temperature of 20 ℃. (Polat et al, 2015) However, for application at elevated temperatures and pumping the cement slurry to great depths in oil wells, MgO is more efficient compared to CaO. In comparison with MgO, CaO exhibits a considerably higher free enthalpy and thus a higher reactivity, even in the dead-burnt state (Ghofrani and Plack, 1993).…”

Section: Expansive Additivesmentioning

confidence: 99%

“…At lower concentrations of nanoclay, internal curing might be the dominant mechanism, but at higher concentrations other mechanisms like pore filling/pore refinement (Sadrmomtazi and Fasihi, 2012) and nucleation (Camiletti et al, 2013;Jayapalan et al, 2010) could be dominant. In general, for internal curing by nanoclays, it's necessary to consider their water adsorption capacity and chemical structure (Polat et al, 2015).…”

Section: Internal Curingmentioning

confidence: 99%

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Cement sheath modification using nanomaterials for long-term zonal isolation of oil wells: Review

Jafariesfad

Geiker

Gong

et al. 2017

Journal of Petroleum Science and Engineering

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Well cementing is an important operation during drilling and completion of oil wells. The cement sheath must maintain well integrity behind the casing and provide long-term zonal isolation to ensure safety and prevent environmental problems. Despite recent technological advancement in smart polymeric materials, fibers and self-healing materials, it is still a big challenge to provide adequate long-term zonal isolation in severe oil well conditions. This review provides an overview of challenges faced in oil wells compromising the long-term ability of the cement sheath to provide zonal isolation. Factors controlling the long-term performance of cement sheath are discussed, in terms of shrinkage, tensile strength and flexibility. The use of nanomaterials as cement additive to fabricate flexible, high-tensile strength, and low-shrinkage cement system are reviewed.Introduction of nanomaterials into the cement system is a promising approach to design a sealant for the entire life of the well, thereby avoiding potential remedial costs and environmental impacts.

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“…The tests were carried out instantly after the initial setting time. The test results were reformed for temperature strain caused by hydration, based on the assumption that the coefficient of linear thermal expansion is 10 × 10 −6 /°C …”

Section: Experimental Workmentioning

confidence: 99%

The influence of expanded perlite aggregate on compressive strength, linear autogenous shrinkage, restrained shrinkage, heat of hydration of cement‐based materials

Polat

Demirboğa

Karagöl

2018

Structural Concrete

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This paper investigates the effects of expanded perlite aggregate (EPA) on the properties of mortar and concrete. A volume of 10, 20, and 30% EPA were used instead of 0–2 mm fine aggregate. Water/binder ratio of 0.30 was constant for all the mortar and concrete mixtures. The compressive strength, ultrasonic pulse velocity (UPV), and linear autogenous shrinkage tests were performed on both mortar and concrete mixtures. Furthermore, the heat of hydration test was only made for mortar mixtures and restrained shrinkage test was only employed to measure cracking time and strain for concrete mixtures. For both mortar and concrete mixtures, the experiments show that the compressive strength, UPV, and linear autogenous shrinkage were generally decreased with increasing the amount of EPA according to control sample, while the heat of hydration is generally increased. However, the reduction ratios in the compressive strength of mortar and concrete samples gradually decreased with increasing the curing time. In addition, the increases in the heat of hydration for EPA10, EPA20, and EPA30 were 5, 7, and 8%, compared with the control.

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Effects of nano and micro size of CaO and MgO, nano-clay and expanded perlite aggregate on the autogenous shrinkage of mortar

Cited by 120 publications

References 41 publications

Reuse of Woody Biomass Ash Waste in Cementitious Materials

Reuse of Woody Biomass Ash Waste in Cementitious Materials

Cement sheath modification using nanomaterials for long-term zonal isolation of oil wells: Review

The influence of expanded perlite aggregate on compressive strength, linear autogenous shrinkage, restrained shrinkage, heat of hydration of cement‐based materials

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