Non-Equilibrium Thermodynamic Modeling Framework for Ordinary Portland Cement/Supplementary Cementitious Material Systems

2020 ◽  
Vol 117 (6) ◽  
Author(s):  
Deborah Glosser ◽  
O. Burkan Isgor ◽  
W. Jason Weiss
Keyword(s):  
Portland Cement ◽  
Thermodynamic Modeling ◽  
Ordinary Portland Cement ◽  
Cementitious Material ◽  
Equilibrium Thermodynamic ◽  
Modeling Framework ◽  
Supplementary Cementitious Material ◽  
Material Systems ◽  
Non Equilibrium

scholarly journals Investigating the Compressive Strength Properties of Concrete Using Some Common Ghanaian Ordinary Portland Cements

2021 ◽  
Vol 6 (2) ◽  
pp. 154-166
Author(s):  
K. S Akorli ◽  
K Danso ◽  
J Ayarkwa ◽  
A Acheampong
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Strength Properties ◽  
Research Strategy ◽  
Cementitious Material ◽  
Direct Function ◽  
Cross Sectional ◽  
Portland Cements ◽  
Concrete Production

In a general sense, concrete is made of cementitious material, aggregates and water but the mix productivity is one issues that affect the amount of strength concrete developed. The concrete mix productivity is a direct function of the amount and quality of the cementitious material. The commonest cementitious material used for concrete in Ghana like other countries in the world is the Ordinary Portland Cement. The research sort to investigate the compressive strength properties of concrete made from some common Ghanaian Ordinary Portland Cement brands mostly used in the countries construction industries. The research strategy adopted was experimental. The research was a cross –sectional studies and used laboratory tests to get information on all cements. Cement grade 42.5N, 42.5R and 32.5R were used. A total of one – hundred and eight (108) concrete cubes were made from nine different brands of Ordinary Portland Cement with a mix design of 1:2:4. No admixtures were used in the mix. It was established that, Ordinary Portland Cement Brand E of grade 42.5R has the highest compressive strength after 28 days. Some of the cement brand with grade 32.5R developed better strength than that of grade 42.5R. Based on the experiment conducted, it can be concluded that for the C15 (1:2:4) and C20 compressive strength as per IS 456:2000, Ordinary Portland Cement Brand E and G of grade 42.5R and Ordinary Portland Cement Brand H and J of grade of 32.5R satisfactory meets the requirement. It implies that some of the Ghanaians Portland Cement developed a satisfactory compressive strength and meets the minimum strength attainment after 28 days’ which is 15 N/mm2. Based on the result, it is recommended that Ordinary Portland Cement Brand E of grade 42.5R should be used for most concrete production and Ordinary Portland Cement Brand J of grade 32.5R can also be used for concrete work in the absence of E 42.5R.   Citation: Akorli, K. S., Danso, K., Ayarkwa, J. and Acheampong, A. (2021). Investigating the Compressive Strength Properties of Concrete Using Some Common Ghanaian Ordinary Portland Cements. International Journal of Technology and Management Research (IJTMR), Vol. 6 (1): Pp.154-166.[Received: March 13, 2021Accepted: September 1, 2021

scholarly journals Use of metakaolin as supplementary cementitious material in concrete, with focus on durability properties

2019 ◽  
Vol 4 ◽  
pp. 89-102 ◽  
Author(s):  
Alice T Bakera ◽  
Mark G Alexander
Keyword(s):  
Portland Cement ◽  
Cementitious Material ◽  
Concrete Durability ◽  
Western Cape ◽  
Supplementary Cementitious Material ◽  
Durability Properties ◽  
Carbonation Resistance ◽  
Performance Results ◽  
Local Materials ◽  
Durability Performance

Numerous research efforts on metakaolin as a supplementary cementitious material (SCM) have been undertaken in the past 20 years. This material, while relatively expensive mainly due to low production volumes worldwide, nevertheless has a significantly lower production cost than Portland cement. However, industry remains tentative in considering metakaolin in concrete. This paper takes the view that industry should consider investing in the production and application of metakaolin in appropriate concrete projects, particularly in aggressive environments where plain Portland cement may be inadequate, and where other SCMs may not readily be available. The main contribution of the paper is a global review of recent studies on the use of metakaolin in different types of concrete. This international experience is then compared with results from a study on the durability performance of metakaolin concrete using local materials in the Western Cape province of South Africa, as a means of concrete performance improvement. The study investigates concrete durability properties: penetrability (sorptivity, permeability, conductivity and diffusion), mitigation of Alkali-Silica Reaction (ASR), and carbonation resistance. The concretes were prepared with three water-binder ratios (0.4, 0.5 and 0.6), and with metakaolin replacement levels of 0% (control), 10%, 15% and 20%. Performance results show that, with increasing metakaolin content, the transport properties of concrete are considerably improved, ASR expansion due to a highly reactive local aggregate decreases to non-deleterious levels, while no detrimental effect on carbonation is observed. Thus, metakaolin could serve as a valuable SCM to enhance the durability performance of concrete in local aggressive environments.

Retarding Action of Various Lead (II) Salts on Setting of Portland Cement

2018 ◽  
Vol 760 ◽  
pp. 43-48
Author(s):  
Martin Keppert
Keyword(s):  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Cement Hydration ◽  
Setting Time ◽  
Lead Sulfate ◽  
Cementitious Material ◽  
Secondary Product ◽  
Experimental Conditions ◽  
Anion Effect ◽  
High Instability

Lead is an example of heavy metal, which influences the course of silicate cement hydration resulting to retardation of setting and hardening. This topic become of importance when a cementitious material is intended to be used as solidification/stabilization matrix for a waste or secondary product containing some lead species. There are literature data on the effect of Pb retarding action but they are incomparable each other due to uneven experimental conditions, used Pb salts, types of cement etc. The present paper aims to describe influence of various lead(II) compounds (nitrate, sulfate and lead(II) oxide) on setting course of Ordinary Portland cement (OPC). The setting was monitored by Vicat apparatus, the dosage of salts (expressed as wt. % of elementary Pb to OPC) was 0.5, 1, 2 and 5%. Obviously the present anions may also influence the setting time; the set of control experiments with sodium salts of above given anions was performed in order to eliminate the anion effect. The PbO was found to be most detrimental towards retarding of setting, while lead sulfate at higher dosages caused high instability of setting (oscillation). The effect of Pb was, in all cases, more important than influence of given anion.

scholarly journals Investigating Filler Characteristics in Upgrading Cold Bituminous Emulsion Mixtures

2014 ◽  
Vol 15 (2) ◽  
pp. 54-71 ◽  
Author(s):  
Shakir Al-Busaltan
Keyword(s):  
Ordinary Portland Cement ◽  
Hot Mix Asphalt ◽  
Cementitious Material ◽  
Filler Materials ◽  
Curing Time ◽  
Supplementary Cementitious Material ◽  
Economic Achievement ◽  
Energy Consumption Reduction ◽  
Consumption Reduction ◽  
First Time

Abstract Cold Bituminous Emulsion Mixtures (CBEMs) could offer significant advantages in contrast to traditional Hot Mix Asphalt (HMA). These advantages are redaction of energy consumption, reduction of emission of pollutants, and reduction of total costs. To date, researchers have attempted, intensively, to upgrade CBEMs’ engineering characteristics to gain their whole advantages. Adding active filler materials such as Ordinary Portland Cement (OPC) develop these characteristics. In this paper, selected waste or by-product materials are investigated as alternatives to OPC. Although OPC alone or with activator has proven successful in improving curing time and mechanical properties, the successful use of waste or by-product alternatives could represent a unique environmental and economic achievement. Thus, for the first time, waste or by-product materials (PFA, PSA, GGBFS, APC, and BFA) were investigated individually and not as Supplementary Cementitious Material (SCM) for improving the curing and strength of CBEM. However, some of these filler showed significant improvement in CBEMs characteristics.

Rock Wool Waste as Supplementary Cementitious Material for Portland Cement-Based Composites

2018 ◽  
Author(s):  
K. D. C. Silva ◽  
G. C. Silva ◽  
J. F. Natalli ◽  
J. C. Mendes ◽  
G. J. B. Silva ◽  
...  
Keyword(s):  
Portland Cement ◽  
Cementitious Material ◽  
Supplementary Cementitious Material ◽  
Rock Wool
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