Monitoring of Portland cement chemical reaction and quantification of the hydrated products by XRD and TG in function of the stoppage hydration technique

2018 ◽  
Vol 136 (3) ◽  
pp. 1269-1284 ◽  
Author(s):  
Marcel Hark Maciel ◽  
Gabriela Simões Soares ◽  
Roberto Cesar de Oliveira Romano ◽  
Maria Alba Cincotto
Keyword(s):  
Portland Cement ◽  
Chemical Reaction ◽  
Hydrated Products

scholarly journals ANALYSIS OF PROPERTIES OF CONCRETE USING SEA SHELLS CRUSHEDPOWDER AS ADMIXTURE

2017 ◽  
Vol 5 (11) ◽  
pp. 374-378
Author(s):  
Vishal Gadgihalli ◽  
Meena ◽  
Lohit ◽  
Raghavendra Prasad HavanjeDinakar ◽  
Babitha Rani
Keyword(s):  
Compressive Strength ◽  
Calcium Carbonate ◽  
Portland Cement ◽  
Chemical Reaction ◽  
Paper Analysis ◽  
Exothermal Reaction ◽  
Reduction Time ◽  
Living Things ◽  
Chemical Admixture ◽  
Physical And Chemical

The tremendous increment of demand on concrete made admixture one of major component. As admixtures help in enhancement of concrete physical and chemical admixture. In this paper analysis of sea shells as chemical admixture is studied and verified the strength of concrete and temperature emitted due to chemical reaction to the normal Portland cement. As sea shells contain calcium carbonate, CaCo3 as major composition, as calcium is one major component that helps in densifying and hardening of bones in all living things. The flexural and compressive strength has gradually increased; the transmission temperature and reduction time of exothermal reaction has reduced. Hence seashell acts as great admixture.

scholarly journals ANALYSIS OF PROPERTIES OF CONCRETE USING MANUFACTURE SAND AS FINE AGGRIGATES

2017 ◽  
Vol 5 (11) ◽  
pp. 338-342
Author(s):  
Vishal Gadgihalli ◽  
Ramya ◽  
Babitha Rani ◽  
Raghavendra Prasad HavanjeDinakar ◽  
Lohith
Keyword(s):  
Compressive Strength ◽  
Soil Erosion ◽  
Portland Cement ◽  
Cement Paste ◽  
Chemical Reaction ◽  
Paper Analysis ◽  
Exothermal Reaction ◽  
Normal Concrete ◽  
River Sand

Aggregate in concrete acts as structural filler, these place a crucial than simple statement implies it is the material that the cement paste coats and blind together. Now a day’s using river sand is prohibited by government, as these cause soil erosion. In this paper analysis of properties of concrete using manufacture sand as course aggregate is studied and verified the strength of concrete and temperature emitted due to chemical reaction to the normal Portland cement. Using manufacture sand as course aggregate the temperature emitted due to exothermal reaction of concrete has reduced. Although the compressive strength of the concrete has reduced compared to normal concrete where no admixtures were used to enhance the properties of concrete.

Mineralogical Analysis of Portland Cement Pastes Rehydrated

2020 ◽  
Vol 46 (1) ◽  
pp. 15-23
Author(s):  
Tiago Assunção Santos ◽  
Guilherme Augusto de Oliveira e Silva ◽  
Daniel Véras Ribeiro
Keyword(s):  
Portland Cement ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Cement Pastes ◽  
X Ray ◽  
Curing Period ◽  
Hydraulic Binder ◽  
Before And After ◽  
Hydrated Products ◽  
Rehydration Process

Hydrated products, such as (hydrated) cement pastes, decomposition through physical-chemical alterations when submitted to high temperatures. One of the main factors that lead to microstructural changes during calcination up to 800ºC, is the dehydration phases of hydrated Portland cement. The present study sought to characterize crystalline phases occurring before and after calcination to the produced pastes using X-ray diffraction (XRD) analysis. Cement pastes were produced using Portland cement CP V-ARI RS, similar to type II (ASTM C150-07), with water/cement ratio 0.5. After a 28-day curing period, the pastes were calcinated at 800°C for 60 minutes with a 10°C/min heating rate. Afterwards, the newly produced hydraulic binder was cooled abruptly and reactivated through a rehydration process, and underwent analyses on the 7 and 28 day. During this study it was observed that the originally hydrated products can be rehydrated.

scholarly journals ANALYSIS OF PROPERTIES OF CONCRETE USING SAFETY MATCHES POWDER AS ADMIXTURE

2017 ◽  
Vol 5 (11) ◽  
pp. 53-56
Author(s):  
Vishal Gadgihalli ◽  
Meena Y.R ◽  
Bharath A.L ◽  
Raghavendra Prasad HavanjeDinakar
Keyword(s):  
Portland Cement ◽  
Chemical Reaction ◽  
Crucial Role ◽  
Paper Analysis ◽  
Exothermal Reaction

Recently admixtures had made a major importance in the concrete manufacturing. These admixtures materials ranged from blood in the history to the recent retarding agents. In this paper analysis of properties of concrete using safety matches powder as admixture is studied and verified the strength of concrete and temperature emitted due to chemical reaction to the normal Portland cement. Using safety matches powder the temperature emitted due to exothermal reaction of concrete has reduced. This gives better results hence we can use this safety matches powder as an admixture where the reacting temperature and the emitting temperature place a crucial role in construction and maintenance.

scholarly journals ANALYSIS OF PROPERTIES OF CONCRETE USING POTASSIUM POWDER AS ADMIXTURE

2017 ◽  
Vol 5 (4RASM) ◽  
pp. 41-45
Author(s):  
Vishal Gadgihalli ◽  
Ramya ◽  
Abrar Khan ◽  
Raghavendra Prasad Dinakar
Keyword(s):  
Portland Cement ◽  
Chemical Reaction ◽  
Crucial Role ◽  
Paper Analysis ◽  
Hardened Concrete ◽  
Exothermal Reaction ◽  
Chemical Admixtures ◽  
Concrete Operations ◽  
The Cost

Chemical admixtures are the ingredients in concrete other than Portland cement, water and aggregate those are added to mix immediately before or during mixing. These admixtures are primarily used to reduce the cost of concrete construction, to modify the properties of hardened concrete, to ensure the quality of concrete during mixing, transportation, placing curing and to overcome certain emergences during concrete operations. In this paper analysis of properties of concrete using potassium power as admixture is studied and verified the strength of concrete and temperature emitted due to chemical reaction to normal Portland cement. Using potassium powder the temperature emitted due to exothermal reaction of concrete has reduced. Thus gives better results hence we can use this potassium powder as an admixture where the temperature and the emitting temperatures place a crucial role in construction and maintenance.

scholarly journals The Influence of Mayenite Employed as a Functional Component on Hydration Properties of Ordinary Portland Cement

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1958 ◽  
Author(s):  
Zhen He ◽  
Yang Li
Keyword(s):  
Portland Cement ◽  
Ordinary Portland Cement ◽  
X Ray Diffraction ◽  
Hydration Properties ◽  
Functional Component ◽  
X Ray ◽  
Consumption Rates ◽  
Hydrated Products ◽  
Experimental Findings ◽  
Good Agreement

Influence of C12A7 (12CaO·7Al2O3) as a functional component on hydration properties of Ordinary Portland Cement is studied using isothermal microcalorimetric technique, X-ray diffraction analysis, and thermodynamic calculation. Meanwhile, hydrate assemblages are simulated by hydrothermal software. C2AH8 (2CaO·Al2O3·8H2O) is generated as a transition phase during the hydration of pure C12A7, while formation of CAH10 (CaO·Al2O3·10H2O) is uncertain. Heat-releasing behavior of Ordinary Portland Cement (OPC) could be noticeably affected by C12A7, especially for the duration of interaction at boundary stage reduces with C12A7 replacement. Correspondingly, all hydration kinetic parameters first increase and then diminish with C12A7 replacement. Simulation results manifest in the main hydration products of OPC being ettringite, C-S-H (Calcium-Silicate-Hydrate) gel, portlandite and brucite. Increasing C12A7 replacement accelerates the consumption rates of gypsum and calcite that are typically included in OPC, and thus the ettringite content is changed and carbonate phases will be produced. Therefore, the microstructure properties of hydrated products of OPC are affected and the compressive strength is influenced. These predications are in good agreement with experimental findings. C12A7 can be used as a functional component to adjust the consumption rate of suphates in OPC, and also components of carbonate phases can be modified in hydrate assemblage.

scholarly journals ANALYSIS OF PROPERTIES OF CONCRETE USING CRUSHED GLASS POWDER AS ADMIXTURE

2017 ◽  
Vol 5 (4RASM) ◽  
pp. 54-58
Author(s):  
Vishal Gadgihalli ◽  
Ramya ◽  
Abrar Khan ◽  
Ranjitha ◽  
Babitha Rani
Keyword(s):  
High Temperature ◽  
Bond Strength ◽  
Portland Cement ◽  
Chemical Reaction ◽  
Crucial Role ◽  
Glass Powder ◽  
Paper Analysis ◽  
Exothermal Reaction

Concrete admixture is added to enhance the properties of concrete to make its function as required. In this paper analysis of properties of concrete using of glass powder as admixture to concrete is studied and verified the strength of concrete and temperature emitted due to chemical reaction to the normal Portland cement. Using of glass powder as admixture the temperature emitted due to exothermal reaction of concrete has reduced. As glass has property of absorbing high temperature. This gives better results hence we can use this glass powder as an admixture. Where the reacting temperature and the emitting temperature place a crucial role in construction, and as glass powder is rigid and non-crystalloid solid this increase bond strength in concrete to increase its strength.

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