Effect of elevated temperatures on mechanical performance of cement mortar with nanoclay

Irshidat, Mohammad R.; Al‐Saleh, Mohammed H.

doi:10.1051/matecconf/201712002005

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…In general, cement substitution by NC with or without SFenhanced compressive strength for all ages 28, 60 and 90 days. From Figure 7, it is clear that Nano-clay addition to cement mortar caused marginal enhancement in its compressive strengths at room temperature in all curing ages, in agreement with previous literature Irshidat and Al-Saleh (2017) and Bhati et al (2017). NCSF-CRETE gained most of its strength after two months, on the contrary to regular concrete (control) where a continuation in the cement reaction is clear up to three months' time.…”

Section: Test Results and Discussionsupporting

confidence: 89%

“…Also, the effect of using superplasticizers with different chemical bases is thoroughly investigated and naphthalin based admixtures seemed to have remarkable merits with Nano additives (Serag, Mohamed et al, 2014;Raouf et al, 2014). Enhancement in concrete mechanical behavior, as compressive strength, bond, durability, permeability, beside corrosion and elevated temperature resistance by using small ratios of Nano Silica (1.5 per cent to 3 per cent) in concrete mixes was not only reported by one of the authors (Ahmed et al, 2018;Serag et al, 2017;El-Feky et al, 2016), but similar results are reported by , Mohamed et al (2016); , ; Sherif (2019), Irshidat and Al-Saleh (2017); Mohammed et al (2014), Morsy et al (2010); Birgisson et al (2012); Ergün et al (2016); Ghazy et al (2015), Shamseldein et al (2018); Ghazaly et al (2018).…”

Section: Introductionsupporting

confidence: 68%

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Assessment of mechanical and fire resistance for hybrid nano-clay and steel fibres concrete at different curing ages

Shalby

Elkady

Nasr

et al. 2019

JSFE

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Purpose Nano-Clay (NC) is reported as a candidate partial replacement for cement, due to its abundance and relatively low cost - beside reported promotion of different concrete properties. On the other hand, Steel Fibres (SF) has proven to have a positive effect on post fire exposure residual strength of concrete. This paper aims to present the outcomes of a comprehensive research program assessing a hybrid mix between NC and SF in concrete mixtures (NCSF-CRETE). Design/methodology/approach Physical chemical and physical characterization of NC is performed using different tools as XRF spectrometer, and TEM micrograph. Fresh concrete properties of NSCF-CRETE as slump and air content are investigated. Enhancement in permeability using NSCF is verified by comparing its resistance to the penetration of chlorides resistance with regular concrete mix. Besides, the proposed NCSF-CRETE compressive strength is evaluated compared to mixes with NC and SF each used separately at different curing ages. Besides, NSCF and compared mixes are exposed to an indirect fire testing program – two hours exposure – for: 300, 450 and 600°C. Degradation in compressive strength was investigated after exposure to different temperatures and percentage of residual strength is reported. Findings Results indicated an improved performance of NCSF -CRETE of about 40% compared to regular concrete in compressive strength at normal conditions. This improvement extended to its behavior when subjected to indirect fire exposure NSCF also maintained 40% more strength than the residual in regular concrete mix – which suffered severe damage – after 2 h exposure to 600°C. Originality/value Using NCSF-Crete allows retrofitting the structure after exposure to such drastic conditions.

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Section: Test Results and Discussionsupporting

confidence: 89%

Section: Introductionsupporting

confidence: 68%

Assessment of mechanical and fire resistance for hybrid nano-clay and steel fibres concrete at different curing ages

Shalby

Elkady

Nasr

et al. 2019

JSFE

View full text Add to dashboard Cite

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“…Zaid et al [31] demonstrated that the solidifying effect of soft soil by the admixture of nanoclay was the best through a triaxial test. Irshidat et al [32] explored the influence of nanoclay on the mechanical properties of modified cement-based materials. e results showed that the bending strength was the best with the 2% admixture of nanoclay at 400°C.…”

Section: Introductionmentioning

confidence: 99%

Unconfined Mechanical Properties of Nanoclay Cement Compound Modified Calcareous Sand of the South China Sea

Wang

Jian

2020

Advances in Civil Engineering

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Calcareous sand is characterized by low strength, multiporosity, and high-pressure shrinkage. This often leads to poor engineering properties. Therefore, it is often necessary to reinforce the calcareous sand in order to meet the actual engineering demand for bearing capacity. To study the modification effect of calcareous sand of nanoclay by cement, mechanical tests and microscopic tests of the cement calcareous sand (CCS) modified by different nanoclay content and cement content were conducted. Through the unconfined compressive test, the mechanical properties of nanoclay and cement compound modified calcareous sand (NCCS) were studied. The micromechanism of nanoclay and cement composite modified calcareous sand was analyzed by SEM. Representative curves of data groups of stress and strain data were obtained by the fusion algorithm, which effectively circumvented the discrete distribution of determined data. Test results showed that the following: (1) The compressive property of CCS could be improved by the admixture of nanoclay, and the optimum admixture ratio was 8%. (2) The admixture of nanoclay could enhance the deformation modulus of CCS and improve the resistance of CCS against external load deformation capacity. (3) Nanoclay could increase the density of the internal structure of CCS and improve its mechanical properties.

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“…Nano clays also have shown great potential to act not only as a filler in concrete mix but also share in pozzolanic reactions. Consequently, leading to significant improvement in different concrete properties (Irshidat and Al-Saleh, 2017;Morsy et al, 2010a, b;Ghazy et al, 2015;Hosseini et al, 2015;Fadzil et al, 2013).…”

mentioning

confidence: 99%

Hybrid concretes: solutions for better bond and splitting tensile strength under elevated heat exposure

Elkady

Bakr

Kohail

et al. 2021

JSFE

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PurposeThis paper presents the second part of the investigation on resistance to elevated temperatures of a proposed hybrid composite concrete (NCSF-Crete) mix. The composite including nano metakaolin (NC) and steel fibers (SF) in addition to regular concrete components has proven -in the first published part-earlier promoted fresh concrete behavior, and to have reduced loss in compressive strength after exposure to a wide range of elevated temperatures. This presented work evaluates another two critical mechanical characteristics for the proposed composite -namely- splitting and bond strengths.Design/methodology/approachA modified formula correlating splitting and compressive strength (28 days) based on experiments results for NCSF is proposed and compared to formulas derived for regular concrete in different design codes. Finally, both spitting and bond strengths are evaluated pre- and post-exposure to elevated temperatures reaching 600 °C for two hours.FindingsThe proposed NCSF-Crete shows remarkable fire endurance, especially in promoting bond strength as after 600 °C heat exposure tests, it maintained strength equivalent to 70% of a regular concrete control mix at room temperature. Improving residual splitting strength was very significant up to 450 °C exposure.Research limitations/implicationsObvious deterioration is monitored in splitting resistance for all concretes at 600 °C.Practical implicationsThis proposed composite improved elevated heats resistance of the most significant concrete mechanical properties.Social implicationsUsing a more green and sustainable constituents in the composite.Originality/valueThe proposed composite gathers the merits of using NC and SF, each has been investigated separately as an addition to concrete mixes.

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Effect of elevated temperatures on mechanical performance of cement mortar with nanoclay

Cited by 6 publications

References 15 publications

Assessment of mechanical and fire resistance for hybrid nano-clay and steel fibres concrete at different curing ages

Assessment of mechanical and fire resistance for hybrid nano-clay and steel fibres concrete at different curing ages

Unconfined Mechanical Properties of Nanoclay Cement Compound Modified Calcareous Sand of the South China Sea

Hybrid concretes: solutions for better bond and splitting tensile strength under elevated heat exposure

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