XRD investigation of cement pastes incorporating concrete floor polishing waste

Silva, L. A.; Nahime, Bacus O.; Lima, E. C.; Akasaki, Jorge Luís; Reis, Idalci Cruvinel dos

doi:10.1590/0366-69132020663802956

Cited by 23 publications

(11 citation statements)

References 23 publications

(26 reference statements)

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“…5. Alkaline sulfate: This phase is formed in the last stages of cooling [30]. The presence of gypsum and bassanite was distinguished in the studied clinker and it appears when analyzed by XRD at the diffraction peak (7.67) A ° and in a very small percentage in the studied samples.…”

Section: Mineralogical Study Of the Produced Clinkermentioning

confidence: 88%

“…The most important mineral phases that appeared in the clinker samples are shown in (Fig. 4) and for several chemical compounds which are: 1-Alite phase (C3S): It is the most important mineral phase in the clinker of ordinary Portland cement (OPC), as it constitutes about 38-60% of cement [29].This mineral phase appears when analyzed by XRD at the diffraction peak (2.77, 2.62 and 2.98A°) and it appears when it is in the monoclinic phase (1.76), (1.79), (1.66) A o [30]. And its presence in the studied clinker samples ranges between (50.77-51.91 %).…”

Section: Mineralogical Study Of the Produced Clinkermentioning

confidence: 99%

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Assessment limestone of Ghar Formation in Al-Busaiyah Area in southern Iraq as Raw Materials for the Manufacture of ordinary Portland cement (OPC)

Ahmed¹,

Faisal²,

Hassan³

2022

Tikrit J. Pure Sci.

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Six samples of limestone rocks were selected for the Early Miocene Ghar Formation in the Busayyah area south of Nasiriyah city in the southern desert of Iraq, and one sample of clay deposits of the Quaternary age was selected for the purpose of geochemical and mineral evaluation for the manufacture of ordinary Portland cement. The results of the analyzes of limestone for the formation of Ghar showed that it contains Ratios (less than 2%) of magnesium oxide, and the percentage of calcium oxide to more than (52%),Which was in conformity with the Iraqi and international specifications [1] and [2] for the cement industry. playa clays in the region study were analyzed for the purpose of testing and demonstrating their suitability for the cement industry, as recent clays have a high percentage of magnesium oxide, as well as its scarcity in the study sections, as the results showed their suitability for the cement industry. The ratios of lime saturation (LSF), alumina ratio (AR) and silica ratio (SR) were calculated for the mixture consisting of limestone to Ghar Formation, clay, Bauxite and iron oxides. (3) Mixtures of different exposed of Ghar formation were burned at a temperature of 1200 and 1450 °C, and the results showed the validity of the produced clinker and its conformity with international specifications when burning at 1450 °C, while the burnt clinker failed at 1200 °C due to incomplete form of cement phases. The proportions of the mineral phases of clinker were calculated after burning and it was found that the phases and minerals of belite, lalite, ferrite aluminate and portlandite. Physical and mechanical tests were carried out on limestone from the Ghar Formation, where the compressive strength, specific weight, total density, moisture content and apparent porosity were analyzed

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Section: Mineralogical Study Of the Produced Clinkermentioning

confidence: 88%

Section: Mineralogical Study Of the Produced Clinkermentioning

confidence: 99%

Assessment limestone of Ghar Formation in Al-Busaiyah Area in southern Iraq as Raw Materials for the Manufacture of ordinary Portland cement (OPC)

Ahmed¹,

Faisal²,

Hassan³

2022

Tikrit J. Pure Sci.

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“…The rapid reaction of OPC is with water to produce a final). The characteristic peaks of C-S-H at 2 θ 32.3º,41.2º, and 63º portlandite reflections is clear at 29º,23.2º, and 62º, and Ca(OH)2 are recorded at 26.7°, 38,4° (Silva et al, 2020 ). The most rapid and frequent reaction due to the hydrated process of OPC paste is the C-S-H phase and C-H phase and these phases are formed due to C3S and C2S phases' reactions with water as found in Fig.…”

Section: X-ray Diffraction Analysis (Xrd)mentioning

confidence: 93%

Assessment of Altawseea Ordinary Portland Cement Northern Iraq: Mineralogy, Microstructure, and Hydration

Al-Jiboory

Al-Hazaa

2022

IGJ

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The current study is an assessment of the Al-Tawsseea Cement Plant, located in the northwest of Iraq, Nineveh. This plant produces Ordinary Portland Cement grade 42.5R according to the I.Q.S No(5)/2019. Ordinary Portland Cement was chosen to determine the mineralogy using X-Ray Diffraction and Scanning Electron Microscope before and after hydration. Physical tests were carried out such as the Fineness Test (Blain) ( 331.4) M2/Kg, Soundness Test (Autoclave) 0.1% Compressive Strength Test (2 Days 22.35 N/mm2 and after 28 Days 47.81 N/mm2) and Setting Time Test (Initial 150 Min and Final 3:10 Hours) and all the physical tests are within the requirements of limits according to I.Q.S No(5)/2019. XRD analyses revealed that the studied cement is composed of alite, belite, ferrite, and aluminate which indicate good burning and cooling processes, while after hydration the paste is composed of CSH, CH, and Ettringite. The Scaning Electron Microscope showed that the studied Ordinary Portland Cement microstructure, characterized by an intensive intergrowth of hypidiomorphic crystals and belite (spherical to oval shape) is less but bigger than alite. After hydration, the microstructure became dense and calcium-silicate hydrate (C-S-H ) formed a lathe-like shape fill the pores of the cement paste and gave the paste hardness and good compressive strength. The pore diameters in studied Ordinary Portland Cement are ranging from 9.9 to more than 15.9 µm. They look like circular or irregular shape and are randomly distributed which decrease the density, and compressive strength of the paste. According to the results of the physical test and mineralogy microstructure, we can say that it is possible to raise the grade of Ordinary Portland Cement of the Al-Tawseea Cement Plant ( 42.5R) by increasing the proportion of calcium in the raw materials mixture within the specification. This will lead to an increase in the value of LSF and the C3S which is responsible for increasing hardness or compressive strength.

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“…Calcite is a stable phase that contributes to a better filling effect [56] in the cementitious matrix around RCA, and the following equation ( 2) sows the carbonation process [55]. Advances in Civil Engineering…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

“…Figure 17 shows that the paste could be initially be dominated by Ca(OH)₂. However, upon exposure to atmospheric conditions, CO₂ diffuses through the paste and reacts with portlandite, forming more calcite [56]. is could be explained by the time factor in which recycled concrete aggregate waste has not been exposed to a long-term period or exposure to from the environment.…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

Contribution of Surface Treatment on Physical and Mechanical Properties of Recycled Concrete Aggregates

Odero¹,

Mutuku

Nyomboi³

et al. 2022

Advances in Civil Engineering

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The demand for virgin aggregates for concrete production worldwide has been increasing. At the same time, there is an increase in the production of rubbles from construction-related activities. The residues are produced either due to leftovers or from the demolished structures. However, worldwide, the utilization of recycled concrete aggregate (RCA) material for structural concrete has been limited, often considered inferior due to distorted surfaces. The problems with RCA arise because it is a composite aggregate made of natural aggregate and cement, and adhered surface mortar is the discontinuities on the surface that arise from the production technique or the strength of the original concrete. The development of hydrated calcium silicate binder in the concrete matrix has been the critical desire of researchers to make better concrete material. This research focuses on the treatment of RCA from locally available rice husk ash with minimum pozzolanic cement. The objective was achieved by conducting tests on the properties of aggregates that include specific gravity and water absorption, aggregate crushing value (ACV), and aggregate impact value (AIV). The effectiveness of the treatment technique is assessed by the analysis of SEM imagery and XRD analysis of the microstructure cement paste around the RCA. At 20% pozzolan concentration, RCA treatment yields comparable specific gravities, water absorption, ACV, and AIV. Furthermore, the replacement of 5% rice husk ash (in 20% concentration) provided the optimal proportion of treatment for RCA, resulting in a reduction of ACV by 31.4%, AIV by 30.0%, and water absorption by 12.7% compared to the untreated RCA. XRD showed that calcite (CaCO₃), quartz, and portlandite phases were the majority in the untreated RCA. The study indicates that pozzolanic cement with 15% can be used with 5% RHA to produce RCA with characteristics almost similar to virgin aggregates. This research presents a consistent methodology to achieve modified RCA for application in construction.

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XRD investigation of cement pastes incorporating concrete floor polishing waste

Cited by 23 publications

References 23 publications

Assessment limestone of Ghar Formation in Al-Busaiyah Area in southern Iraq as Raw Materials for the Manufacture of ordinary Portland cement (OPC)

Assessment limestone of Ghar Formation in Al-Busaiyah Area in southern Iraq as Raw Materials for the Manufacture of ordinary Portland cement (OPC)

Assessment of Altawseea Ordinary Portland Cement Northern Iraq: Mineralogy, Microstructure, and Hydration

Contribution of Surface Treatment on Physical and Mechanical Properties of Recycled Concrete Aggregates

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