Characterization of Red Ceramic Waste for Application as Mineral Addition in Portland Cement

2021 ◽  
Vol 33 (6) ◽  
pp. 04021108
Author(s):  
J. Hoppe Filho ◽  
C. A. O. Pires ◽  
O. D. Leite ◽  
M. R. Garcez ◽  
M. H. F. Medeiros
Keyword(s):  
Portland Cement ◽  
Ceramic Waste ◽  
Mineral Addition

Characterization of Micro-Pore Structure in Novel Cement Matrices

2014 ◽  
Vol 1712 ◽  
Author(s):  
Seyoon Yoon ◽  
Isabel Galan ◽  
Kemal Celik ◽  
Fredrik P. Glasser ◽  
Mohammed S. Imbabi
Keyword(s):  
Portland Cement ◽  
Pore Structure ◽  
Engineering Properties ◽  
Calcium Sulfoaluminate ◽  
Pore Structures ◽  
Porosity And Permeability ◽  
Experimental Protocols ◽  
Novel Processing ◽  
Main Component

ABSTRACTCalcium sulfoaluminate (CSA) cements are being developed using a novel processing method having as its objective lowering specific CO2 emissions by ∼50% relative to a Portland cement benchmark. We need to be able to measure the properties of the products. Porosity and permeability measurements help define the engineering properties but their quantification is influenced by the choice of experimental protocols. In the present study we used ordinary Portland cement (PC) paste as a benchmark and hydrated ye’elimite, which is a main component of CSA cements, to understand its pore structure. We report on the use of synchrotron-sourced radiation for µCT (Computerized Tomography) and 3D image re-construction of the internal micro-pore structure of PC and ye’elimite-gypsum pastes. As a comparison, porosity and permeability measurements were traditionally obtained using Mercury Intrusion Porosimetry (MIP). The Mori-Tanaka method and the polynomial statistical model were used to analyze the effects of different 3-D micro-pore structures on mechanical properties. The results show that e micro-pore structures differ considerably between PC and ye’elimite pastes and their bulk modulus is significantly affected by the shapes of their micro-pore structures.

Characterization of the Initial Hydration Process of Ordinary Portland Cement Based on Low-Field NMR

2018 ◽  
Vol 50 (1-3) ◽  
pp. 187-198
Author(s):  
Jin-hua Huo ◽  
Zhi-gang Peng ◽  
Zhongbin Ye ◽  
Qian Feng ◽  
Yong Zheng ◽  
...  
Keyword(s):  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Hydration Process ◽  
Low Field ◽  
Low Field Nmr

The Role of Temperature on Hydration of Binary System of Metakaolin/Portland Cement

2016 ◽  
Vol 851 ◽  
pp. 51-56 ◽  
Author(s):  
Martin Boháč ◽  
Radoslav Novotný ◽  
Jakub Tkacz ◽  
Miroslava Hajdúchová ◽  
Martin Palou ◽  
...  
Keyword(s):  
Binary System ◽  
Portland Cement ◽  
Isothermal Calorimetry ◽  
Chemical Characterization ◽  
Exothermic Peak ◽  
Early Hydration ◽  
Different Temperatures ◽  
C 50

The role of temperature of metakaolin/Portland cement binary system was studied by isothermal calorimetry. Sample with 50 % of metakaolin replacement were monitored at 30 °C, 40 °C, 50 °C and 60 °C. Structural and chemical characterization of hardened pastes was obtained by scanning electron and Raman microscopy. Paper deals with kinetics of main exothermal reactions during early hydration of the system. Activation energies were calculated for processes related to each exothermic peak. The nature of hydration products at different temperatures was revealed by microstructural studies.

Characterization of radionuclides present in portland cement, gypsum and phosphogypsum mortars

2019 ◽  
Vol 155 ◽  
pp. 315-318 ◽  
Author(s):  
Danielle Cristine Narloch ◽  
Sergei Anatolyevich Paschuk ◽  
Janine Nicolosi Corrêa ◽  
Zildete Rocha ◽  
Wellington Mazer ◽  
...  
Keyword(s):  
Portland Cement

scholarly journals Mineralogical Characterization of Dolomitic Aggregate Concrete: The Camarasa Dam (Catalonia, Spain)

Minerals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 117
Author(s):  
Encarnación Garcia ◽  
Pura Alfonso ◽  
Esperança Tauler
Keyword(s):  
Portland Cement ◽  
Type A ◽  
Alkali Silica Reaction ◽  
Type B ◽  
Mineralogical Characterization ◽  
Group Mineral ◽  
X Ray ◽  
Concrete Type ◽  
Further Development

The Camarasa Dam was built in 1920 using dolomitic aggregate and Portland cement with two different compositions: type A (dolomite and Portland cement) and type B (dolomite and sand-cement). The sand cement was a finely powdered mixture of dolomite particles and clinker of Portland cement. The mineralogy of concrete was studied by optical microscopy, scanning electron microscopy, and x-ray powder diffraction. Reaction of dedolomitization occurred in the two types of concrete of the Camarasa Dam, as demonstrated by the occurrence of calcite, brucite, and/or absence of portlandite. In the type A concrete, calcite, brucite, and a serpentine-group mineral precipitated as a rim around the dolomite grains and in the paste. The rims, a product of the dedolomitization reaction, protected the surface of dolomite from the dissolution process. In type B concrete, in addition to dolomite and calcite, quartz and K-feldspar were present. Brucite occurred in lower amounts than in the type A concrete as fibrous crystals randomly distributed in the sand-cement paste. Although brucite content was higher in the type A concrete, type B showed more signs of loss of durability. This can be attributed to the further development of the alkali-silica reaction in this concrete type.

scholarly journals Industrial Wastes as Alternative Mineral Addition in Portland Cement and as Aggregate in Coating Mortars

2017 ◽  
Vol 20 (suppl 2) ◽  
pp. 358-364 ◽  
Author(s):  
Kamilla Almeida Oliveira ◽  
Bruna Inácio Nazário ◽  
Antonio Pedro Novaes de Oliveira ◽  
Dachamir Hotza ◽  
Fabiano Raupp-Pereira
Keyword(s):  
Portland Cement ◽  
Industrial Wastes ◽  
Mineral Addition
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