Value-added utilization of marine clay as cement replacement for sustainable concrete production

2018 ◽  
Vol 198 ◽  
pp. 867-873 ◽  
Author(s):  
Hongjian Du ◽  
Sze Dai Pang
Keyword(s):  
Value Added ◽  
Marine Clay ◽  
Cement Replacement ◽  
Sustainable Concrete ◽  
Concrete Production

scholarly journals Recycling of Coal Ash in Concrete as a Partial Cementitious Resource

Resources ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 99 ◽  
Author(s):  
Sajjad Ali Mangi ◽  
Mohd Haziman Wan Ibrahim ◽  
Norwati Jamaluddin ◽  
Mohd Fadzil Arshad ◽  
Sri Wiwoho Mudjanarko
Keyword(s):  
Tensile Strength ◽  
Bottom Ash ◽  
Coal Ash ◽  
Pozzolanic Reaction ◽  
Concrete Construction ◽  
Great Opportunity ◽  
Strength Performance ◽  
Cement Replacement ◽  
Sustainable Concrete ◽  
Partial Cement Replacement

Concrete construction offers a great opportunity to replace the cement with a coal-based power plant waste—known as coal bottom ash (CBA)—which offers great environmental and technical benefits. These are significant in sustainable concrete construction. This study aims to recycle CBA in concrete and evaluate its particle fineness influence on workability, compressive and tensile strength of concrete. In this study, a total of 120 specimens were prepared, in which ground CBA with a different fineness was used as a partial cement replacement of 0% to 30% the weight of cement. It was noticed that workability was decreased due to an increased amount of ground CBA, because it absorbed more water in the concrete mix. The growth in the compressive and tensile strength of concrete with ground CBA was not significant at the early ages. At 28 days, a targeted compressive strength of 35 MPa was achieved with the 10% ground CBA. However, it required a longer time to achieve a 44.5 MPa strength of control mix. This shows that the pozzolanic reaction was not initiated up to 28 days. It was experimentally explored that 10% ground CBA—having particle fineness around 65% to 75% and passed through 63 µm sieve—could achieve the adequate compressive and tensile strength of concrete. This study confirmed that the particle fineness of cement replacement materials has a significant influence on strength performance of concrete.

scholarly journals Development of Concrete Mixture Design Process Using MCDM Approach for Sustainable Concrete Quality Management

2020 ◽  
Vol 12 (19) ◽  
pp. 8110
Author(s):  
Mohd. Ahmed ◽  
Javed Mallick ◽  
Saeed AlQadhi ◽  
Nabil Ben Kahla
Keyword(s):  
Quality Management ◽  
Design Process ◽  
Design Procedure ◽  
Mixture Design ◽  
Design Methods ◽  
Concrete Mixture ◽  
Sustainable Concrete ◽  
Concrete Production ◽  
Concrete Mix ◽  
Concrete Quality

The development of a concrete mixture design process for high-quality concrete production with sustainable values is a complex process because of the multiple required properties at the green/hardened state of concrete and the interdependency of concrete mixture parameters. A new multicriteria decision making (MCDM) technique based on Technique of Order Preference Similarity to the Ideal Solution (TOPSIS) methodology is applied to a fuzzy setting for the selection of concrete mix factors and concrete mixture design methods with the aim towards sustainable concrete quality management. Three objective properties for sustainable quality concrete are adopted as criteria in the proposed MCDM model. The seven most dominant concrete mixture parameters with consideration to sustainable concrete quality issues, i.e., environmental (density, durability) and socioeconomic criteria (cost, optimum mixture ingredients ratios), are proposed as sub-criteria. Three mixture design techniques that have potentiality to include sustainable aspects in their design procedure, two advanced and one conventional concrete mixture design method, are taken as alternatives in the MCDM model. The proposed selection support framework may be utilized in updating concrete design methods for sustainability and in deciding the most dominant concrete mix factors that can provide sustainable quality management in concrete production as well as in concrete construction. The concrete mix factors found to be most influential to produce sustainable concrete quality include the water/cement ratio and density. The outcomes of the proposed MCDM model of fuzzy TOPSIS are consistent with the published literature and theory. The DOE method was found to be more suitable in sustainable concrete quality management considering its applicable objective quality properties and concrete mix factors.

scholarly journals Environmental benefits of incorporating palm oil fuel ash in cement concrete and cement mortar

2020 ◽  
Vol 158 ◽  
pp. 03005 ◽  
Author(s):  
G.A. Jokhio ◽  
H.M. Hamada ◽  
A.M. Humada ◽  
Y Gul ◽  
Abid Abu-Tair
Keyword(s):  
Palm Oil ◽  
Cement Mortar ◽  
Environmental Benefits ◽  
Partial Replacement ◽  
Cement Concrete ◽  
Palm Oil Fuel Ash ◽  
Cement Replacement ◽  
Concrete Production ◽  
Fuel Ash ◽  
Oil Fuel

Palm oil fuel ash (POFA) is a by-product waste material from palm oil with many economic and environmental benefits. A lack of enough information on the advantages of POFA in the concrete production in various proportions was the main cause to carry out this work. This paper shows advantages of POFA as a partial replacement of cement in concrete production, especially cement mortar. The data collection has been done from the literature review related to the use of POFA as partial cement replacement in the production of cement concrete and mortar. Therefore, this paper can potentially become a guide for researchers and manufacturers to use POFA in various proportions to replace the ordinary Portland cement (OPC) in cement concrete and mortar. The positive and negative impact resulting from this material has been discussed carefully. This study recommends that researchers and academics should perform more experimental works in order to illustrate the desired benefits from POFA as cement replacement, thus mitigate the adverse environmental impacts of cement.

scholarly journals Waste Slag from Heating Plants as a Partial Replacement for Cement in Mortar and Concrete Production. Part I—Physical–Chemical and Physical–Mechanical Characterization of Slag

Minerals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 992
Author(s):  
Andrijana Nedeljković ◽  
Marija Stojmenović ◽  
Jelena Gulicovski ◽  
Nenad Ristić ◽  
Sonja Milićević ◽  
...  
Keyword(s):  
Silica Fume ◽  
Mechanical Characterization ◽  
Setting Time ◽  
Partial Replacement ◽  
Minimal Amount ◽  
Cement Replacement ◽  
Physical Chemical ◽  
Concrete Production

Numerous factors influence the complexity of environmental and waste management problems, and the most significant goal is the reuse of materials that have completed their “life cycle” and the reduction in the use of new resources. In order to reduce impact of waste slag on the environment, in the present study, waste slag, generated in heating plants after lignite combustion, was characterized in detail and tested for application as a replacement for cement in mortar or concrete production. For physical–chemical characterization of slag, different experimental and instrumental techniques were used such as chemical composition and determination of the content of heavy metals, investigation of morphological and textural properties, thermal analysis, X-ray, and infrared spectroscopy. Physical–mechanical characterization of slag was also performed and included determination of activity index, water requirement, setting time and soundness. A leaching test was also performed. Presented results show that waste slag may be used in mortar and concrete production as a partial cement replacement, but after additional combustion at 650 °C and partial replacement of slag with silica fume in the minimal amount of 12%. The maximal obtained cement replacement was 20% (17.8% slag and 2.2% of silica fume).

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