Abstract The impact of microbial calcium carbonate on concrete strength has been extensively evaluated in the literature. However, there is no predicted equation for the compressive strength of concrete incorporating ureolytic bacteria. Therefore, in the present study, 69 experimental tests were taken into account to introduce a new predicted mathematical formula for compressive strength of bacterial concrete with different concentrations of calcium nitrate tetrahydrate, urea, yeast extract, bacterial cells and time using Gene Expression Programming (GEP) modelling. Based on the results, statistical indicators (MAE, RAE, RMSE, RRSE, R and R2) proved the capability of the GEP 2 model to predict compressive strength in which minimum error and high correlation were achieved. Moreover, both predicted and actual results indicated that compressive strength decreased with the increase in nutrient concentration. In contrast, the compressive strength increased with increased bacterial cells concentration. It could be concluded that GEP2 were found to be reliable and accurate compared to that of the experimental results.
#2Panagiotis G. Asteris(School of Pedagogical and Technological Education)H-Index: 37
Despite the extensive use of mortars materials in constructions over the last decades, there is not yet a reliable and robust method, available in the literature, which can estimate its strength based on its mix parameters. This limitation is due to the highly nonlinear relation between the mortar’s compressive strength and the mixed components. In this paper, the application of artificial intelligence techniques toward the prediction of the compressive strength of cement-based mortar materials ...
Last. Guangdong Tian(SDU: Shandong University)H-Index: 33
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Abstract Proper estimation of electricity consumption is one of the influential factors for sustainability and cleaner production inboth developed and developingcountries. Many studies have been conducted to present accurate prediction models for forecasting electricity demand. However, researchers are still working to develop models with higher accuracy.This study applies a newer branch of Genetic Programming(GP) as a soft computing technique, known as Multi Expression Programming (MEP) to pred...
Abstract The growing concern about global climate change and its adverse impacts on societies is putting severe pressure on the construction industry as one of the largest producers of greenhouse gases. Given the environmental issues associated with cement production, Geopolymer Concrete (GPC) has emerged as a sustainable construction material. This research experimentally studied the effect of partially substituting ground granulated blast-furnace slag (GGBS) with silica fume (SF) and natural z...
Abstract Advances in technology and environmental issues allow the building industry to use ever more high-performance engineered materials. In this study, the hardness of concrete mixtures with high-volume fly ash (HVFA) has been evaluated and modeled for the LEED (Leadership for Energy and Environmental Design). High-performance building materials may have greater strength, ductility, external factor resistance, more environmentally sustainable construction, and lower cost than conventional bu...
Alkali activated concretes have emerged as a prospective alternative to conventional concrete wherein diverse waste materials have been converted as valuable spin-offs. This paper presents a wide experimental study on the sustainability of employing waste sawdust as a fine/coarse aggregate replacement incorporating fly ash (FA) and granulated blast furnace slag (GBFS) to make high-performance cement-free lightweight concretes. Waste sawdust was replaced with aggregate at 0, 25, 50, 75, and 100 v...
Abstract In this study, the effect of nano-calcium carbonate (nano-CaCO3) as an additive to the cement paste was evaluated and quantified. Microstructure tests, experimental tests, and modeling were conducted to predict the cement paste's rheological properties namely yield stress (yield point), shear stress limit, viscosity, and stress at the failure of cement at fresh and hardened stages. The cement paste modified with nano-CaCO3 was tested at a water-to-cement ratio of 0.35 with 0.45 and temp...
#1Momina Rauf(National University of Sciences and Technology)H-Index: 3
#2Wasim Khaliq(National University of Sciences and Technology)H-Index: 14
Last. Iftikhar Ahmed(National Agricultural Research Centre)H-Index: 23
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Abstract Carrier compounds besides the type of bacteria for microbial induced calcite precipitation are equally important in self-healing concrete. This study investigates the potential utilization of natural fibers namely, coir, flax, and jute fibers to carry bacterial spores for self-healing in concrete. The comparison is drawn for introducing calcite precipitation bacteria namely Bacillus subtilis KCTC-3135T, Bacillus cohnii NCCP-666, and Bacillus sphaericus NCCP-313 in concrete along with ca...
Last. Rami A. Hawileh(AUS: American University of Sharjah)H-Index: 28
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Abstract The compressive strength of Ultra-High Performance Concrete (UHPC) is a function of the type, property and quantities of its material constituents. Empirically capturing this relationship often requires the utilization of intelligent algorithms, such as the Artificial Neural Network (ANN), to derive a predictive model that fits into an experimental dataset. However, its black-box nature prevents researchers from mathematically describing its contents. This paper attempts to address this...
The experimental design of high-strength concrete (HSC) requires deep analysis to get the target strength. In this study, machine learning approaches and artificial intelligence python-based approaches have been utilized to predict the mechanical behaviour of HSC. The data to be used in the modelling consist of several input parameters such as cement, water, fine aggregate, and coarse aggregate in combination with a superplasticizer. Empirical relation with mathematical expression has been propo...
Abstract Microbial calcium carbonate has been widely investigated to self-heal concrete cracks. However, the issue revolving around the efficacy of crack self-healing remains important. In particular, existing works are still lacking of a better understanding of the factors affecting the fundamental reactions involved as well as bacterial growth in harsh condition such as concrete. In this study, a comprehensive investigation was conducted to explore the bacterial growth and influential factors ...
Last. Hassan Amer Algaifi(UTHM: Universiti Tun Hussein Onn Malaysia)H-Index: 3
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Abstract null null The present study developed a cleaner production bio-cementitious mortars (BCM) using immobilised Bacillus sphaericus activity. In order to achieve a sustainable enhancement of BCM, the effect of curing in distilled water (DW as normal water), deposition medium (DM as controlled nutrient), and runoff water (RW as uncontrolled nutrient) was investigated compared to control cementitious mortars (CCM). The BCM production was optimised based on curing days (3–90 days) and setting ...