Environmental effects on concrete using Ordinary and Pozzolana Portland cement

Parande, A.K.; Babu, B. Ramesh; Pandi, Kalimuthu; Muthusamy, Karthikeyan; Palaniswamy, N.

doi:10.1016/j.conbuildmat.2010.06.027

Cited by 39 publications

(14 citation statements)

References 21 publications

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“…The intensities of the Si-O bending bands of NS10 and SF10 after 28 days of curing dropped noticeably, while those of OPC and FA10 did not change significantly. These findings were further evidences for the polymerization of the silica groups and formation of C-S-H bonds in NS10 and SF10 as curing time was extended to 28 days 48 . After 28 days of curing, the lowest intensities were observed for the Si-O bending bands of the NS10 specimen, highlighting the highest degree of polymerization silica (SiO 4 ) units with the formation of C-S-H phase in NS10 compared to OPC, FA10 and even to SF10 [19,48] .…”

Section: Characterization Of the Mortar Specimensmentioning

confidence: 76%

“…These findings were further evidences for the polymerization of the silica groups and formation of C-S-H bonds in NS10 and SF10 as curing time was extended to 28 days 48 . After 28 days of curing, the lowest intensities were observed for the Si-O bending bands of the NS10 specimen, highlighting the highest degree of polymerization silica (SiO 4 ) units with the formation of C-S-H phase in NS10 compared to OPC, FA10 and even to SF10 [19,48] . Figure 5a, 5b and Figure 6a, 6b present TG and DTG curves of the mortar specimens containing 10 wt% of NS, SF and FA after 7 days and 28 days of curing, respectively.…”

Section: Characterization Of the Mortar Specimensmentioning

confidence: 76%

“…bonds decreased as C-S-H crystals formed 48 . The intensities of the 949 cm -1 band of OPC after 7 days of curing and 28 days of curing overlapped, indicating deceleration of C-S-H formation as the curing time was prolonged in OPC.…”

Section: Characterization Of the Mortar Specimensmentioning

confidence: 99%

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Comparative study of the characteristics of nano silica - , silica fume - and fly ash - incorporated cement mortars

2014

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The structural characteristics of cement mortars, impregnated with nano silica (NS), silica fume (SF) and fly ash (FA), were comparatively studied using Fourier transform infrared spectrometer (FTIR), thermogravimeter-differential thermogravimeter (TG-DTG) and scanning electron microscope (SEM). The mechanical strengths of the specimens were determined at early (7th day) and standard (28th day) curing ages. The compressive strengths and flexural strengths developed in the mortar specimens containing NS particles were found considerably higher than those of the corresponding specimens of SF and FA over and above the control at both ages. FTIR, TG-DTG and SEM analyses results were consistent with the remarkable increase in the mechanical strength of the mortars with NS. These increases in the strengths of the mortars with NS are attributable to the nano sized particles and extensive surface area of NS. The nano sized particles, as nucleating agents, promoted the hydration of C 3 S and C 2 S and the formation of C-S-H phase. Plenty of active sites on the surface of NS particles induced their pozzolanic reactivity and the extent of bond formation between NS particles and free CH.

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Section: Characterization Of the Mortar Specimensmentioning

confidence: 76%

Section: Characterization Of the Mortar Specimensmentioning

confidence: 76%

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Comparative study of the characteristics of nano silica - , silica fume - and fly ash - incorporated cement mortars

2014

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“…The bands that arose at 1630 cm −1 and 3450 cm −1 were attributed to the bending (H-O-H) and stretching vibrations (-OH) of the hydroxyl groups in hydrated products. These bands appeared together with the sharp peak that originated at 3640 cm −1 , which also corresponded to -OH stretching vibrations (Parande et al, 2011). The evolution of this band was linked to that attributed to calcium hydroxide in the thermogravimetric diagrams (the 520-580°C region in Figure 7), which persisted after 90 d of curing and registered decreasing intensities with increasing TCW contents.…”

Section: Microstructural Studiesmentioning

confidence: 80%

Ceramic tiles waste as replacement material in Portland cement

Mas

Monzó

Payá

et al. 2016

Advances in Cement Research

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The pozzolanic reactivity of real ceramic waste from different tile manufacturing companies was evaluated and its suitability as a partial Portland cement replacement was analysed. The raw material was finely ground and physicochemically characterised using x-ray fluorescence (XRF), x-ray diffraction (XRD), scanning electron microscopy (SEM) and laser analysis particle size distribution (ADL). Percentages of ceramic waste (from 15 wt% to 50 wt%) to substitute Portland cement were used to assess this material's pozzolanic behaviour, and samples were cured at 20°C for different curing times. pH tests and conductivity measurements were used to evaluate its pozzolanic character, while mortars were utilised to evaluate compressive strength behaviour. The microstructural evolution of the developed binders was assessed in pastes by XRD, thermal analysis, Fourier transform infrared spectroscopy (FTIR) and SEM analyses. A strength gain due to pozzolanic activity was observed after 28 d and 90 d curing. The results prove that mortars with up to 35 wt% of tile ceramic waste comply with the requirements established for fly ash pozzolanic materials.

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“…FTIR spectra of RC, CA, FA20CA which have been defined as fingerprint evidence for the degree of polymerization with the formation of calcium-silicate-hydroxide phase due to hydration [24] having strong band observed at 900 cm -1 and the band observed at 520 cm -1 were associated with the bending-in-plane vibrations of the Si-O bonds in C3S (tricalcium silicates) and C2S (dicalcium silicates) [25][26][27][28]. The intensity of these bending-in-plane vibrations of the Si-O bonds decreased as calcium-silicate-hydroxide crystals formed [24,29]. Therefore, it is evident that the intensity of calcium-silicate-hydroxide gel and CaCO3 crystals are much higher in FA20CA and CA while comparing with RC in that order.…”

Section: Microstructural Analysismentioning

confidence: 99%

Self-Healing Ability of High-Strength Fibre-Reinforced Concrete with Fly Ash and Crystalline Admixture

Reddy

Theja²,

Sashidhar

2018

CivileJournal

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The aim of this study is to analyse the self-healing capability of high-strength fibre-reinforced concrete (M70) with fly ash and crystalline admixture (CA) in four types of environmental exposures i.e. Water Immersion (WI), Wet-Dry Cycles (WD), Water contact (WC) and Air Exposure (AE). Specimens for four mixes are cast, one mix containing 1.1% of CA and three mixes with 10%, 20% and 30% partial replacement of cement with fly ash and additions of 1.1% CA. The specimens were pre-cracked at 28 days, in the range of 0.10-0.40 mm and the time set for healing was 42 days. The result shows that all the mixes have considerable amount of closing ability and strength-regaining capability for all exposure conditions. The concrete with 20% fly ash and 1.1% CA has complete crack closing ability and 100% strength-regaining capability for WI and WD cycle conditions. From SEM analysis, it is confirmed that self-healing products are CaCO3 and C-S-H gel.

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Environmental effects on concrete using Ordinary and Pozzolana Portland cement

Cited by 39 publications

References 21 publications

Comparative study of the characteristics of nano silica - , silica fume - and fly ash - incorporated cement mortars

Comparative study of the characteristics of nano silica - , silica fume - and fly ash - incorporated cement mortars

Ceramic tiles waste as replacement material in Portland cement

Self-Healing Ability of High-Strength Fibre-Reinforced Concrete with Fly Ash and Crystalline Admixture

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