Fire is one of the most unfavorable conditions that cement-based composites can face during their service lives. The uniaxial tensile and flexural properties steel-polyvinyl alcohol fiber-calcium carbonate whisker (CW) multi-scale fiber reinforced cement matrix (MSFRCs) under high temperatures are studied, including strength, deformation capacity, energy dissipation its ability to be assessed through empirical calculation method. study showed with increase treatment temperature, MSFRC...

Stimulus-responsive covalent organic frameworks (COFs) own color-switching characteristics when exposed to external stimuli. However, the investigations on multiple solvent-responsive COFs remain a challenge due synthetic difficulties and uncontrollable charge transfer process toward various solvents. In this contribution, two novel isomeric with regulated intramolecular (ICT) by modulating distance between donor/acceptor linkage are synthesized. The as-prepared exhibited significantly...

High performance concrete (HPC) was prepared using lithium-slag and fly ash,which are the industrial waste in Xinjiang Province,China,and its mechanical properties,crack resistance impermeability of concrete. The results showed that: lithium slag can well improve properties concrete, after adding ash, total dosage 20%, improving effect on is best; 50%, improvement cracking particularly evident, significantly interface structures products. At early hydration, admixture involved secondary...

In high–strength concrete, the reinforcement concentration will cause some problems in beam–column joints (BCJs) due to a large amount of transverse reinforcement. Hence, main object this paper is prevent and reduce BCJs through ideal usage steel fibers reinforced concrete. Pseudo–static tests on seven specimens were carried out investigate evaluate seismic performance fiber concrete (SFRHC). Test variables volume ratio, strength, stirrup ratio core area, an axial compression column end....

In China, as statutory non-cultural relic buildings, the conservation and reuse of historic buildings have received increasing attention in recent years. Among them, investigation value evaluation are basis core work, many cities explored related technologies methods according to local conditions. This paper takes building resources Xi’an research object, with registration principles scientificity operability. It proposes basic processes for investigating constructs a step-by-step system...

Using industrial waste (lithium-slag and steel-slag) for the preparation of high-performance concrete, same mix proportion’s concrete are cured using six kinds method, which is to required age later tests its chloride ion diffusion coefficient by RCM method. The results show that: 28d 84d decreases with lower water-binder ratio. It can achieve RCM-Ⅴ grade when water binder ratio 0.27. admixtures total 275-350kg/m3 appropriate constant.The conservation,water solution 5% Nacl after 7d 14d in...

This paper reports on the flexural behavior of nine steel fiber reinforced-recycled aggregate concrete (SFRAC) beams through combined experimental and finite element analysis. The test parameters in this study include volume fraction, recycled replacement ratio, strength. failure modes, crack development, load-deflection curves, bearing capacity SFRAC are investigated detail. results indicated that cracks crushing formed compression zone all specimens. increases with increase fraction...

The uniaxial tensile properties of multi-scale fiber-reinforced cementitious material (MSFRCM) with steel and polyvinyl alcohol (PVA) fibers calcium carbonate whisker (CW) were studied. results showed that CW improved the stiffness, strength, peak strain, toughness steel-PVA hybrid material. not only played a role in small deformation stage but also load holding capacity during large stage. Computational models to assess strength MSFRCM established. Microstructure observations PVA formed...

Early shrinkage cracking of high performance concrete is a current hotspot research at home and abroad.In order to make full use local lithium-slag resources in Xinjiang,We lithium slag as admixture its early-age anti-cracking capability under low water binder ratio. Ring method test on the influence dosage anti-crak conditions same surface area (950m2/kg) ratio(0.27).We have obtained best dosages which can resist craking by monitoring strain observating cracks. Therefore, 30%dosages for...

The present research study aims to investigate numerically the behavior of steel fiber-reinforced high-strength concrete (SFRHC) beam–column joints (BCJs) under seismic action. Based on plastic damage constitutive model and elastic–plastic mixed-strengthen material, finite element software ABAQUS was utilized establish 3D (FE) BCJs. Additionally, feasibility accuracy numerical simulation were verified by comparing computed results experimental observations in terms hysteresis curves,...

To improve the seismic behavior of shear walls, a new composite wall composed steel-fiber-reinforced high-strength concrete (SFRHC) web and two square concrete-filled steel tube (CFST) columns, namely with CFST is proposed in this paper. Therefore, main purpose paper to present an experimental investigation SFRHC columns. Pseudo-static tests were carried out on seven performance walls was studied quantified terms aspects energy consumption, ductility stiffness degradation. Furthermore,...

In order to solve the serious question of early cracking concrete in drying environment western china. Using same volume steel slag substituting fine aggregate (coarse aggregate) mixing with its porous characteristics, which are carried out by knife-edge method. The result shows that: compressive strength is better than blank group at 7d and 28d ages;The Water holding capacity, time delayed, width area crack significantly reduced increase water-cement ratio. Simultaneously, water retention...

The steel fiber reinforced concrete (SFRC) shear wall with filled tube (CFST) columns is an innovative composite structure. In order to calculate the strength of SFRC CFST columns, softened strut and tie model (SSTM) was proposed based on analysis mechanism columns. SSTM composed diagonal, horizontal, vertical mechanisms, in which contributions concrete, reinforcement, web were identified. capacities 24 walls calculated compared available test results, reasonable agreement obtained. results...

Steel fiber and Nano–SiO2 reinforced concrete is a novel material of which has great potential to be used in practical engineering. However, there relatively little literature available on the flexural behavior steel materials (SFNMRC) beams. Hence, main objective this paper investigate performance SFNMRC beams through combined experimental theoretical studies. A total 10 specimens were tested effect some key parameters, including strength, volume fraction fiber, amount Nano–SiO2. The load...

As chloride ion diffusion in concrete theoretical model without considering the shortcomings of maturity,the improved maturity is used to establish relationship between coefficient maturity. With mathematical derivation, getting new theoretically, which considers concrete, binding capacity, degradation effects chlorine equation,and consequently broadens scope fick's second law diffusion, besides, its form and solution completely consistent with one fick equation. By calculation example,it...

Tracer experiment to obtain flow longitudinal dispersion coefficient is the most direct and reliable method. In this paper, existing natural rivers tracer experimental method for calculating analyzed comprehensively. Focuses on of moments, principles applications regression analysis, calculus optimization methods, analyzes their advantages disadvantages. recent years outstanding, determine river was developed applied an instance some new experiment. Local conditions should combine with...

This article analyze the slope stability by strength reduction method named Phi-c which supplied FE software PLAXIS. The factor is suggest to be safety of at moment when reaches instability, numerical non-convergence occurs simultaneously. position sliding surface and dynamic simulation instability can obtain as well. has compared results calculated other methods Bishop ABAQUS with difference between 2%-3% attest its accuracy practicability in engineering.

With the development of economy, high-rise buildings in medium and small cities quickly developed what to bring great challenge higher requirements for Construction enterprise. Combined with construction features buildings, management work, strengthening key control is one best way promote at top enterprise level. This paper respectively from high building organization measures, design, dynamic deep foundation pit supporting, standard lines strength concrete analysis expounds that points.

This article analyze the slope stability by strength reduction method named Phi-c which supplied FE software PLAXIS. The factor is suggest to be safety of at moment when reaches instability, numerical non-convergence occurs simultaneously. position sliding surface and dynamic simulation instability can obtain as well. has compared results calculated other methods Bishop ABAQUS with difference between 2%-3% attest its accuracy practicability in engineering.

Steel fiber reinforced concrete (SFRC) is a novel material of concrete, which has great potential to be used in practical engineering. Based on the finite element software Opensees, main objective this paper presented numerical simulation method investigating seismic behavior SFRC–beam-column joints (BCJs) through modifying calculation joint shear and longitudinal reinforcement slip deformations. The feasibility accuracy modeling were verified by comparing computed results with experimental...