Showing papers in "Construction and Building Materials in 2020"

TL;DR: An intelligent approach based on the machine learning technique is proposed for predicting the compressive strength of concrete by employing the adaptive boosting algorithm to construct a strong learner by integrating several weak learners, which can find the mapping between the input data and output data.

TL;DR: In this paper, a comprehensive investigation of the durability characteristics of UHPC is provided to provide fundamental information for material testing requirements and procedures and expand its practical applications, which can serve as a potential candidate for concrete structures exposing to aggressive environments.

TL;DR: Geopolymer cements are mainly produced by using secondary raw materials such as fly ash, metakaolin, calcined clays, zeolite etc. Geopolymers minimize CO2 emission and may be a partial alternative to Portland cement in the building industry as discussed by the authors.

TL;DR: The hybridization of the models with GWO improves the training and generalization capability of both ANN and ANFIS models and it is deduced that ANN models trained with Levenberg-Marquardt algorithm outperformed other ANN-based models as well as all ANfIS- based models.

TL;DR: Examination of several Machine Learning models for forecasting the mechanical properties of concrete, including artificial neural networks, support vector machine, decision trees, and evolutionary algorithms are examined.

TL;DR: An improved deep fully convolutional neural network, named as CrackSegNet, is proposed to conduct dense pixel-wise crack segmentation, making tunnel inspection and monitoring highly efficient, low cost, and eventually automatable.

TL;DR: In this article, a state-of-the-art review was conducted on three types of novel engineered wood composites, namely fiber reinforced polymer (FRP) reinforced glulam, cross-laminated timber (CLT), and wood scrimber, with particular attentions to their manufacturing technologies, modeling approaches, and mechanical properties.

TL;DR: In this article, the effect of rubber particle size, percentage replacement and various treatment methods on different mechanical properties of rubber concrete, studied over the last 30 years, was considered and a rubber treatment method that can address the concerns of high flammability and the resultant release of noxious gases from the rubber particles, when exposed to fire.

TL;DR: In this article, the effect of the incorporation of coarse recycled concrete aggregates (RCAs) on the durability of cement-based cementitious materials was experimentally investigated, and the results indicate that the incorporation generally decreases the compressive strength, and inversely increases water and chloride transport coefficient compared to those of the control concrete.

TL;DR: In this article, the authors presented a summary mainly about the chemistry of epoxy resins, the curing mechanism and properties of polypropylene epoxy materials covering epoxy asphalt, epoxy emulsified asphalt and epoxy concrete.

TL;DR: In this paper, a comprehensive review of the properties of UHPC and its application in bridge engineering is provided, including jointed and jointless bridge components, such as piers, girders, decks, and link slabs.

TL;DR: In this paper, the effects of using recycled concrete aggregate and pozzolanic materials as a partial replacement of natural coarse aggregate (NCA) and cement, respectively, on the mechanical and permeability properties of fiber-reinforced pervious concrete mixes were investigated.

TL;DR: In this paper, the authors present results from the first-ever experimental study on the behavior of axially loaded circular sea-sand concrete columns confined by polyethylene terephthalate (PET) FRP jackets, which are composed of a new and more promising type of FRP composites with a bilinear stress-strain response and a large rupture strain.

TL;DR: A brief overview of the recycled steel fibers from different sources, their characteristics, and application in the production of various cement-based composites has been provided in this paper, which aims to critically examine the currently reported literature and to identify research gaps for those who intend to further study the behavior of recycled steel fiber reinforced cementitious systems for various applications.

TL;DR: A comprehensive overview of the current works on workability, mechanical properties (tensile, interlaminar shear, transverse shear and flexural strength), bond behavior, durability, and applications of FRP reinforced seawater sea sand concrete (FRP-SWSSC) can be found in this paper.

TL;DR: In this article, the authors summarized the principles, advantages and disadvantages of the methods for improving the microstructure of RCA from four aspects, such as removal of attached mortar in the RCA, surface coating on RCA and different mixing methods and CaCO3 precipitation.

TL;DR: In this article, the effects of steel fiber reinforcement on the compressive and tensile strength of UHPC are discussed. But the effect of fibres on compressive strength seems to be questionable.

TL;DR: In this paper, a non-proprietary 3D-printable ultra-high-performance fiber-reinforced concrete (UHPFRC) was developed and compared to that of conventional mold-cast UHPFCC.

TL;DR: In this article, a review paper summarizes the previous studies until 2019, discussing the use of recycled plastic aggregate as fine aggregate in cementitious composites and its impact on physical, mechanical properties and durability.

TL;DR: In this paper, the authors provide an insight into the available CO2 technologies for concrete improvement, including carbon-conditioning and carbon-curing, for improving the overall quality of recycled aggregate concrete as well as permanently chemically converting CO2 into stone.

TL;DR: In this paper, a review of the optical and thermal performance of window systems containing phase change material (PCM) in buildings is presented, and the challenges and future works of glazing units containing PCM are addressed.

TL;DR: In this paper, the effect of elevated temperature on the thermal-physical behaviors and mechanical properties of fly ash-based geopolymer paste was investigated, and a positive linear relationship between the bond strength and the compressive strength was found for both GPC and OPC.

TL;DR: In this article, the mechanical properties and microstructure of lightweight self-compacting concrete (LWSCC) incorporating rice straw ash (RSA) and cotton stalk ash (CSA) as a replacement ratio by weight of cement content were evaluated.

TL;DR: In this article, the quantitative relationship between the content of old attached mortar and the performance of recycled aggregate at the material level was analyzed. And three aspects of the performance prediction, application range and reinforcement method for RAs were illustrated in the article.

TL;DR: In this paper, the effects of PS and FA on C-S-H structure, long-term hydration heat, hydration products, mechanical properties and volume deformation of cement paste/concrete were investigated and compared via 29Si NMR nuclear magnetic resonance (29Si NMRI), X-ray diffraction (XRD), scanning electron microscopy (SEM), thermal analysis and the dissolution method.

TL;DR: In this article, the performance of kenaf/sisal fiber fabric reinforced bioepoxy hybrid composites was evaluated under accelerated weathering conditions and the results indicated that these fully bio-based composites are promising composite material for semi-structural applications.

TL;DR: In this article, a sustainable self-compact concrete (SCC) was proposed by substantially substituting natural aggregates with RCA and cement with SCM by using a combination of fly ash, slag and/or silica fume.

TL;DR: In this article, the fundamental mechanisms of biological soil improvement methods, such as microbially induced calcium carbonate precipitation (MICP) and biopolymer treatment (BPT), are reviewed.

TL;DR: In this paper, the effects of combined incorporation of supplementary cementitious materials (SCMs) and hook-ended steel fibers (HSF) on compressive behavior and durability of Recycled aggregate concrete (RAC) are presented.

TL;DR: In this article, the authors evaluated the effects of additives on softening coefficient, flexural and compressive strength of stabilized samples with 55°C curing temperature and found that the additive effect had a significant improvement on loess stabilization.