Concrete waste is the most prominent construction and demolition waste generated by the construction industry, which is mainly disposed to landfills. Recycling this waste in the form of recycled concrete aggregates (RCA) and substituting it for natural aggregates in the production of concrete could lead to environmental conservation. A growing body of literature in lab settings has already recognized

Earthen sites have important social, historical, artistic, and scientific value. Basal erosion, which is closely related to soluble salt, is one of the most important reasons for the destruction of earthen sites. Soil hydrophobicity may change the path of water–salt migration. Thus, it can protect earthen sites by inhibiting basal erosion at the bottom of earthen walls. However, the changes in the

This study investigated the potential of calcium aluminate cement (CAC) to solidify/stabilize Cr(VI) (Na2CrO4). The hydration and microstructure development of CAC pastes in the presence of Na2CrO4 were examined by means of isothermal calorimetry, XRD, TG/DTG and SEM-EDS. The leaching properties of Cr(VI) were evaluated by TCLP and GANC methods. The results demonstrated that addition Na2CrO4 significantly

In this study, a basalt fiber strain-hardening cementitious composite (BF-SHCC) with good high-temperature mechanical performance was developed, and its static and dynamic compressive properties at elevated temperatures were investigated. The BF-SHCC lost its strain-hardening behavior at 200 °C. At a constant strain rate, the dynamic compressive strength and specific energy absorption of the BF-SHCC

With this present work, the authors intend to outline the framework of the properties of calcined quarry dust (CQD) activated binders. Compressive strength, phase assembles, and the pore structure were investigated and compared with CaO activated binder. The research work has brought about a discovery that CQD activated binders presented higher compressive strength than CaO activated binders after

This study experimentally investigated the mechanical properties of basalt-macro polypropylene hybrid fibre reinforced concrete. Three macro polypropylene fibre volume fractions (0.3%, 0.7% and 1%), two concrete compressive strengths (30 MPa and 60 MPa) and basalt fibre volume fraction 0.1%, were used to study their influences on the slump, compressive strength and flexural capacity of fibre reinforced

This experimental investigation was carried out to evaluate the potential of garnet residue, a by-product from the abrasive industry, as an aggregate in cement mortar through the physical, mechanical, microstructure, leaching and radiological properties. The findings revealed that the sand replacement by garnet residue enhanced the physical and mechanical properties. In radiological experiments, the

Engineered wood-based products manufactured from fast-growing wood species have gained increasing attraction as the demand for using wood in building constructions continues to grow. An innovative oriented oblique strand laminated lumber called Eucalyptus Strand Wood (ESWood) made from fast-growing eucalyptus is presented in this paper. A series of material tests using small clear specimens were carried

An experimental test was conducted to analyze the Local Bond Stress (LBS) between Ultra-High-Performance Concrete (UHPC) and reinforcing steel bars. The test included 144 specimens based on RILEM standards, using pullout tests. Reinforcing steel bars of 16 mm and 18 mm in diameter, nano-silica contents from 0% to 6.5% by weight of cement, conventional and thermal curing methods, and the bond lengths

Pavement crack plays an important role in estimating pavement conditions and implementing pavement maintenance management. There are three shortcomings summarized. (1) Low contrast between crack pixels with surrounding pixels; (2) intensity values along crack discontinuous; (3) complexity structure instead of unitary and unbranched cracks. The proposed algorithm, including three essential steps to

Cement-based grouting material (CBGM) had many characteristics such as high-early-strength, high strength and high fluidity. It has been widely used in building structural reinforcement projects. This paper presents an experimental study to investigate the bond behavior between CBGM and steel bar under repetitive loading in early age after fire. The hysteretic behavior of pull-out specimen cast with

In the last decades, the increasing need for strengthening and retrofitting of existing masonry members has led the scientific community toward the development of innovative strengthening systems. Among these systems, inorganic-matrix composite materials have been gaining increasing popularity due to their effectiveness, relatively low cost, ease of the application, and reversibility of the intervention

Proper fracture characterization of Hot Mix Asphalt (HMA) is crucial to enhance the durability of pavement structures. This work evaluates the influence of the loading rate on the fracture behaviour of a typical dense-graded asphalt mixture and its correspondent mortar or Fine Asphalt Mixture (FAM). Semi-Circular Bending (SCB) tests were conducted under intermediate temperature (24 ± 1 °C), and six

The ionomer material is widely used as interlayers in the laminated glass, and its tensile property plays a decisive role in the post-fracture response of the laminated glass. Since the ionomer material is a kind of polymer, its mechanical behaviour is highly affected by strain rate and temperature. In this work, two series of uniaxial tensile tests, low strain rate series (10−3s−1~10−1s−1) and medium

Pervious concrete (PC) comprised of cement, water, coarse aggregates are widely used nowadays for sustainable and low impact pavement. The primary purpose of this study is to investigate the performance enhancement of pervious concrete blocks (PCB) containing recycled coarse aggregates (RCA) through microbially induced calcium carbonate precipitation (MICP). Two types of bacterial enhancement methods

This paper presents an experimental investigation of the hygrothermal and mechanical properties of green concrete containing different content and size of flax shives. This allows it to respond to different applications in the building domain. Results of microscopic observations by using scanning electron microscopy show that the flax shives have a very complex and porous microstructure. The latter

The breaking process and damage distribution characteristics of concrete are the theoretical basis for improving the quality and safety of concrete impacted by abrasive water jet (AWJ) technology. Therefore, the process of AWJ impacting concrete is monitored online based on acoustic emission (AE) technology in this paper. The results show that the AE signals of AWJ impacting concrete have two peaks

This paper introduces a new bio-rejuvenator made from a blend of high-protein algae and high-lipid animal manure and studies its interaction with aged bitumen molecules to revitalize aged asphalt. True revitalization requires restoring not only the chemical balance but also the molecular conformation. Therefore, rejuvenators should be able to de-agglomerate oxidized asphaltenes while compensating for

For a single batch material, time intervals and nozzle standoff distances between two subsequent layers are two critical printing parameters that influence the mechanical performance of the printed concrete. This paper presents an experimental and numerical study to investigate the impacts of these printing parameters on the interlayer bond strength of the 3D printed limestone and calcined clay-based

In this paper, the mechanical properties of Engineered Cementitious Composites (ECC) with two different fly ash contents after sub-elevated temperature exposure were investigated systematically at multiple scales. At composite level, uniaxial compressive and tensile tests were performed on specimens underwent 20 °C, 50 °C, 100 °C, and 200 °C exposure. The results indicate that, as temperature rise

Precast retaining walls, like other structural elements, should be produced with quality and be inspected during service life. The objective of our research was to evaluate whether the ultrasound testing allows to infer quality parameters (strength and stiffness) of precast parts for containment walls, before (classification) and after (inspection) the installation. Assuming 5% as the maximum safety-related

Headed studs are often used to facilitate composite actions between steel and concrete structures. In steel building structures, reinforced concrete walls are commonly used to ensure composite action to stiffen steel frames as a lateral resistance system against horizontal loads, such as earthquakes or wind. Such walls need to be anchored to the steel frame by headed studs, and these must be able to

An investigation was undertaken to study the behaviour of cement-stabilized aggregate mixtures modified with small amounts of rubber under compressive loading with the aim of providing more sustainable and less brittle mixtures for use in semi-rigid pavements. Three rubber replacement levels (15%, 30%, and 45% by same volume of one aggregate fraction that has similar particle gradation) were investigated

Low adhesion between emulsified asphalt mortar and aggregate can enormously result in poor properties of emulsified asphalt mixture. The adhesion performance can also be directly influenced by the viscosity of cement emulsified asphalt mortar (CEAM). In this work, Brookfield viscometer was used to test the viscosity of CEAM with different cement content, temperature and mixing time. Then, influence

The impact of particle size distribution on flocculation and its growth in cement-ground limestone suspensions was investigated by observing the flocculation states with a microscopic image analyzer and calculating the microscopic interparticle forces based on the multifractal methods and extended DLVO theory. The results showed that the particle size distribution exhibits a clear fractal feature and

Chinese Q690D high strength steel has begun to be applied in building structures in recent years, but researches on ductile fracture behavior of Q690D steel are still insufficient, and most of the mechanical fracture models based on micro fracture mechanics mechanism ignore shear effect. In this paper, the yield surface size of materials considered the shear effect through Lode parameter, and a continuous

To reduce the cost of high viscosity asphalt, SBS/C9 petroleum resin blends (SPR) were prepared via a simple one-pot polymer alloying process as modifiers for high viscosity asphalt in this study. The chemical characteristics of SRP and its modification effect on asphalt were studied and also compared with the traditional modifier (Tafpack-Super, abbreviated as TPS). Results show that SPR modifier

The ageing coefficient is required in the age-adjusted effective modulus method to assess the effect of creep in concrete structures subjected to varied stress history. In this paper, experiments were carried out to calibrate the ageing coefficient for early age tensile creep of blended slag and low calcium fly ash geopolymer concrete. The development of total strains of geopolymer concrete under sustained

In this study, the influence of mineral admixtures on magnesium oxysulfate (MOS) pastes was investigated, specially the replacement of MgO by carbonates and their effects on hydration kinetics, microstructure and mechanical properties. In this way, Thermal analyses (TG/dTG), Scanning Electron Microscopy (SEM) and Calorimetry were applied. Further investigation has been conducted to verify the compressive

Prior work to characterize the hydration products in a cement paste prepared with a sodium nitrite-based antifreeze admixture that effectively promoted hydration at subfreezing temperatures did not reveal anything unusual in the chemical composition, suggesting that the nature of the antifreeze action was physical (i.e., preventing the freezing of water) rather than chemical. To confirm this, the time

In this study, it was evaluated the combined cleaning treatment based on laser ablation followed by the application of chemical products for removing alkyd graffiti paint from two different types of stone. Three different laser treatments (operated in Q-switched, long Q-switched and free short running modes) were applied to the stone samples. The best two treatments were then followed up by application

Grey clay bricks (GCBs) are a traditional and unique masonry material for Chinese buildings, and their application is especially prevalent in traditional Chinese architectures. Despite that structural analyses of historical constructions have been a popular area of focus in recent studies, information on the behaviour of GCB masonry structures is still lacking. In this paper, a comprehensive characterization

One of the most important features of asphalt mixes is their ability to undergo self-healing after certain time intervals. Increasing the temperature can accelerate the healing process. In this study, the heating process will be triggered by using microwave technology when ferrite powders is added in asphalt mixes. Fracture tests were performed on open-graded friction course (OGFC) asphalt and ferrite-filled

Gypsum is among the widely used construction materials, and is nowadays been considered for a variety of applications including soil stabilization, foundation works, grouting and brick manufacturing etc. Considering this prevalent utilization of gypsum in construction industry, a comprehensive study was conducted to examine the time-dependent strength and deformation characteristics of Gypsum Mixed

The utilization of alternative supplementary cementitious materials (ASCM) and additives in concrete becomes a daily practice due to the increased awareness of their socio-ecological impacts. Exploring for renewable resources of ASCM has been the driving force for the research on this topic since decades. Waste materials have been shown to possess intrinsic physico-chemical properties dependent on

Cement emulsified asphalt mixtures are a kind of potential pavement material, but the adhesion between coarse aggregate and asphalt still needs to be studied. In this paper, a qualitative analysis method of the surface morphology of coarse aggregate was proposed and used to evaluate the surface morphologies of four kinds of coarse aggregate, including diabase, basalt, steel slag and recycled aggregate

This paper presents the development and characterisation of prototype wheat straw bales that have been produced specifically for use as a building insulation material. The use of straw bales still remains niche in the wider construction market. Whilst traditional straw bales can be used for either loadbearing or non-loadbearing applications, it is their thermal resistance that is of greatest benefit

One of the difficulties of using some residues, such as those from stones beneficiation (cutting and polishing), is their heterogeneity. This study analyzes the influence of the heterogeneity of waste from wet processing of ornamental stones (marble, granite, slate, among others) on the performance of Portland cement composites when used at a 20% replacement of cement. The mechanical behavior (compressive

Research on durability of alkali-activated slag concrete (AASC) has received great attention but there are considerably few studies on the effect of carbonation on steel corrosion. In this paper, effects of activator types (waterglass and sodium hydroxide) and exposed concentrations of CO2 (0.03%, 3% and 20% by volume) on steel corrosion have been investigated, in both AASC and ordinary Portland cement

In this study, the effects of micro-steel fiber, pelletized fly ash lightweight aggregate and microsilica content on the fresh and hardened properties of high-performance cementitious composite (HPCC) were experimentally investigated. Micro-steel fibers having a length of 6 mm were used in the production of mixtures at the level of 0%, 1% and 2% by total volume. Besides, artificial lightweight aggregate

Experimental research on durability of high-performance synthetic fibers reinforced concrete (HPSFRC) is conducted based on its excellent mechanical performance. The results indicate that HPSFRC shows superior resistances to sulfate attack and freezing-thawing over the ordinary concrete due to its excellent anti-crack performance. HPSFRC has an optimum dosage of high-performance synthetic fiber (HPSF)

Certain drawbacks of alkali-activated slag (AAS) concrete, such as rapid reactions releasing substantial heat and higher drying shrinkage, limit its application in practice. This work investigated controlling the hardening temperature, shrinkage, and cracks by means of low-temperature preparation technology. The effects of different curing procedures on the hardening temperature, drying shrinkage,

Synchrotron X-ray diffraction investigations were performed to study the reactivity of a nanolime produced by an innovative method based on an ion exchange process, both in aqueous and in alcoholic suspensions. Moreover, for the first time, the nanolime reactivity was investigated both on laboratory glass slides and directly on artistic relevant stones, the biocalcarenite of Agrigento. The results

The present article presents the construction and evaluation of an experimental stretch of highway with environmentally sustainable mixes; warm mixes asphalt and recycled warm mixes asphalt. Six trial sections of an urban highway were constructed with different structural characteristics. Each section was 15 cm thick and 90 m long. The asphalt mixes used for construction of the experimental sections

Pervious concrete piles (PCP) have high permeability and strength. During installation by vibrating-sinking tube construction, liquified soil migrates into PCP, leading to clogging. To study PCP clogging, model tests and X-ray computed tomography analyses were carried out. The clogging depth, porosity, and excess pore water pressure dissipation were characterized. The effect of geotextile on PCP anti-clogging

Zero-stress temperature (ZST), defined as an inelastic indicator for the behavior of concrete elements in early-age, is one of the critical factors affecting the behavior and performance of concrete pavements. However, available and reliable methods for selecting this parameter are still limited. In this paper, a numerical approach to predict ZST in concrete pavement slabs was proposed. A one-dimensional

Presenting a promising option that could be used to encapsulate nuclear waste material for disposal, supersulfated cement (SSC) is, again, receiving wide attention among research community as a cementitious system that has noteworthy properties. It is also an environmentally friendly cement since it is mainly composed of ground granulated blast furnace slag (GGBS) that is activated by a sulphate source

This study used PCM/SiC-based composite aggregates made using slag aggregate, paraffin wax, and silicon carbide. Concrete samples were prepared by replacing natural coarse aggregates with PCM/SiC-based composite aggregates at various replacement ratios. Compressive strength tests, Fourier-transform infrared spectroscopy, thermogravimetric analysis, X-ray diffraction, and scanning electron microscopy-energy

The effect of early-age frost damage on the hydration characteristics, pore structure and compressive strength of cement paste and the repair effect of nano-SiO2 on the damaged microstructure were investigated. The samples were prepared with nano-SiO2 content of 0% and 0.9% by weight of cement. The mercury intrusion porosimetry (MIP) data indicated that early-age frost damage can result in a part of

Nanomaterials for asphalt modification and incorporating nanoparticles into asphalt mixtures to deal with road failure have gained popularity recently. Researchers have reported the improved performance of asphalt modified by carbon nanotubes (CNTs), but the cost is very high with the relatively high CNTs content. This work studied the composites modification for asphalt by CNTs and polymer with a

The manufacturing process of pig iron generates large amounts of slag. The slow cooling of this waste generates the air-cooled blast furnace slag (ACS). Since it is less reactive than granulated blast furnace slag (GBFS), ACS finds little use as supplementary cementitious material (SCM) and the existing studies use it only as aggregates in concrete. This work investigated the use of finely ground ACS

This investigation focused on the effect of nanoparticles on microstructural surface characteristics, abrasion, and skid resistance of concrete pavements. Firstly, the percentage of optimal replacement of nanoparticles was determined. In the second part, the nano-modified concrete similar to mortars in terms of water-to-cement and sand-to-cement ratio were made to study the abrasion resistance and

A study of metakaolin and limestone powder on sulfate resistance of cement-based materials was carried out by compressive strength changes, sulfate attack experiment as well as the microstructure development using X-ray diffraction (XRD), thermogravimetric analysis (TG/DTG), and 27Al magic-angle spinning nuclear magnetic resonance (27Al MAS NMR) techniques. It was found that metakaolin with 10% was

The evaluation of the seismic behaviour of existing buildings is a problem increasingly felt in Italy, due to the many earthquakes that have recently occurred. The test methods currently used for the in situ assessment of the shear characteristics of masonry structures are highly destructive for the existing buildings, especially for heritage buildings. Furthermore, the way of preparation of the test

In karst areas, the water inflow in underground pipelines often shows the features of large and high flow rate that is extremely difficult to treat. Due to long hardening time, poor bonding of the interface and low retained rates during dynamic water filling, the ordinary inorganic grouting materials are easy to lead to sealing failure. Magnesium phosphate cement has the characteristics of good interfacial