Showing papers in "Construction and Building Materials in 2018"

TL;DR: In this paper, the authors reviewed the literature on the production and utilisation of recycled aggregate in concrete, concrete pavements, roadway construction, and other civil engineering works and some discussion on the savings on CO2 emissions have been included.

TL;DR: Computational times for DCNN are shorter than the most efficient edge detection algorithms, not considering the training process, and show significant promise for future adoption of DCNN methods for image-based damage detection in concrete.

TL;DR: In this article, the effects of print-time interval on the inter-layer strength, along with compressive and flexural strengths of extrusion-based 3D printed concrete in different directions were investigated.

TL;DR: In this paper, the tensile strength and elongation of the UHP-ECC achieved were 20 MPa and 8.7% respectively, which combines the strain-hardening and multiple crack characteristics and the high strength of mortar matrix.

TL;DR: In this article, an environmental friendly cementitious mixture that is compatible with an extrusion-based printing process was proposed, where the authors investigated the six replacement ratio of tailing to sand from 0% to 50% and developed a single nozzle printing system.

TL;DR: In this paper, the effect of RCA to concrete and a treatment method utilized to improve the properties of the RCA by reducing the amount of the adhered mortar, and therefore improving the mechanical properties and durability of RAC.

TL;DR: In this paper, the authors reviewed the material and structural performances of geopolymer concrete to identify the research gaps in this area for future research development, and showed that the structural properties of the concrete can be improved by using more structural elements and more desirable structural performances compared with conventional counterparts.

TL;DR: In this article, a series of experiments were carried out to measure workability, setting time, compressive strength, splitting tensile strength, flexural strength and dynamic elastic modulus of AAFS concrete.

TL;DR: This paper reports on the material characterization and fabrication steps of a straight 3.00 m long RC beam together with the results of a full-scale three-point bending test performed on it and a demonstration of the potentialities of this approach.

TL;DR: In this article, the effect of adding steel fibers with different lengths and diameters on the mechanical properties of concrete for three values of concrete strength was investigated, and the results indicated that the addition of different content and lengths of steel fiber with increasing water-to-cement ratios caused significant change in concrete, with an increase of about 10-25% in compressive strength and about 31-47% in direct tensile strength.

TL;DR: In this paper, a novel 3D printing concrete ink that has good fluidity during movement and satisfying standing behavior at static state due to the structural rebuilding of cement paste advanced by the addition of nano clay (NC) and silica fume (SF) was specially designed to be extruded through a nozzle to print layer-over-layer components for an innovative additive manufacturing process.

TL;DR: In this paper, a review article deals with the mechanical properties of sisal fiber and the several factors influencing the properties of its polymer composites, such as fibre loadings, fibre length, fibre architecture, chemical treatments and hybridization by incorporating different natural/synthetic fibre/fillers or additive, according to the application and strength requirements.

TL;DR: Graphene and graphene-based nanosheets (GNS) possess extraordinary mechanical, chemical, thermal and electrical properties, enabling attractive applications, ranging from structural strength/durability improvement, anti-corrosion, to self-cleaning surfaces and energy saving.

TL;DR: Limestone powder has been widely used in cement-based materials; and reportedly, can influence their properties by filler, nucleation, dilution and chemical effects as mentioned in this paper. But, the action mechanism of LS mainly depends on its particle size and amount.

TL;DR: The prediction model based on deep learning exhibits the advantages including higher precision, higher efficiency and higher generalization ability compared with the traditional neural network model, and could be considered as a new method for calculating the strength of recycled concrete.

TL;DR: In this paper, a review of the drying shrinkage behavior of slag, fly ash and metakaolin-based binders with slag precursors is presented, and different solutions to limit the shrinkage are also presented.

TL;DR: An intelligent technique is proposed for predicting the unconfined compressive strength (UCS) of CPB using a combination of the artificial neural network (ANN) and particle swarm optimization (PSO).

TL;DR: In this paper, an overview of a number of studies related to the ageing process in bitumen, to determine the main component affecting this phenomenon is provided, and a review is presented of the in-laboratory tests used to simulate the different ageing processes (short-term ageing, long-term aging, UV ageing) that occur in the field, along with a description of the techniques currently employed to analyse what happens to the binder after ageing.

TL;DR: In this article, the authors compared the mechanical performance of clayey soil stabilization using volcanic ash (VA) based geopolymer and ordinary Portland cement (OPC) and determined the effects of curing conditions and time.

TL;DR: The characteristics of TRM composites are addressed and an insight into relevant experimental procedures and results of retrofitted masonry elements to illustrate the effectiveness ofTRM for enhancing strength and deformation capacity are given.

TL;DR: The result indicates that the MFA-ANN hybrid system can obtain a better prediction of the high-performance concrete properties and can provide an efficient and accurate tool to predict and design HPC.

TL;DR: In this article, a review of PU and its utilization in structural and infrastructural applications comprehensively, in terms of engineering properties, protective coatings, utilization in composite applications, and in strengthening and retrofitting of structural elements with PU and their modified products.

TL;DR: The dependence of the compressive strength upon dry density, water content, curing conditions, cement type and foaming agents employed in the cement paste is investigated in this paper, where the authors present the first results of an ongoing experimental campaign focused on foamed concrete.

TL;DR: In this article, the advantages of UHPC compared with the common concrete, such as superior mechanical performance, excellent anti-seismic property and resistance against environmental degradation are introduced.

TL;DR: In this article, the authors applied the Fuller Thompson theory and Marson-Percy model in designing cementitious materials for 3D Cementitious Materials Printing (3DCMP), and various gradation methods were adopted in this study.

TL;DR: In this paper, an experimental investigation was carried out to study some mechanical and microstructural characteristics of fly ash based geopolymer mortars reinforced with three different fiber types: steel, polypropylene, and polyvinyl alcohol fibers.

TL;DR: In this article, a feasibility study on 3D-printing of steel reinforcement using gas-metal arc welding is presented, and the performance of the printed bars is investigated by means of uniaxial tension tests.

TL;DR: In this paper, a thorough review of the composition and properties of bricks and the various factors related to its manufacturing process is highly required for better standardization of bricks, which will help in achieving the goal of sustainable development.

TL;DR: In this paper, a two-stage Ramberg-Osgood model is used to model the engineering stress-strain response of cold-formed steels, which can be accurately described by the values of the key input parameters.

TL;DR: In this paper, the micro-structure analyses of the geopolymer specimens and comparison of geopolymers with various binders are presented. But, most of the products revealed a wide hump in the XRD analysis due to the amorphous structure of aluminosilicate, and the results showed that the binders mixed with lower sodium silicate to sodium hydroxide mass ratio of 2.0-2.5 tend to react more efficiently.