Recycling waste tire rubber by incorporating it into concrete has become the preferred solution to dispose of tires. In this study, effect volume content crumb and pretreatment methods on performances was evaluated. Firstly, fine aggregate mixture were partly replaced produce concrete. Secondly, mechanical durability properties with different replacement forms contents had been investigated. Finally, after six modifiers introduced mixture. Corresponding tests conducted verify effectiveness...

Pervious concrete (PC), as an environmental friendly material, can be very important in solving urban problems and mitigating the impact of climate change; i.e., flooding, heat island phenomena, groundwater decline. The objective this research is to evaluate strength, permeability, freeze-thaw durability PC with different aggregate sizes, porosities, water-binder ratios. orthogonal experiment method employed study nine experiments are conducted. compressive flexural permeability coefficient,...

Basalt fiber has a great advantage on the mechanical properties and durability of reactive powder concrete (RPC) because its superior chemical corrosion resistance. In this paper, basalt was adopted to modified RPC, plain (PRPC), (BFRPC) steel (SFRPC) were prepared. The freeze–thaw BFRPC with different contents tested compared PRPC SFRPC investigate effects type RPC. Besides, mass loss rate compressive strength RPC under two conditions (fresh-water chloride-salt freeze–thaw) evaluate...

This study focuses on improving the performance of asphalt mixture at low- and high- temperature analyzing effect diatomite basalt fiber mixture. Based L

The passivation behavior of steel reinforcements in concrete is significantly influenced by the environment, pore solution, and passive film formed on surface. present study used electrochemical methods to successfully characterize process concrete. commonly HRB400 reinforcement material was studied using various parameters quantitatively. As soaking test time increased, OCP gradually increased stabilized after 5 days, indicating that electrode transitioned from an active state a simulated...

Concrete is a versatile material widely used in modern construction. However, concrete also subject to freeze–thaw damage, which can significantly reduce its mechanical properties and lead premature failure. Therefore, the objective of this study was assess laboratory performance damage characteristics common mix proportion based on compressive tests acoustic technologies. Freeze–thaw were evaluated via testing, mass loss analysis, ultrasonic pulse velocity testing. Acoustic emission (AE)...

In Northeast (NE) China, the largest commodity grain base and natural forest area in both agricultural production ecological protection require attention. recent years, land degradation NE China has increased, seriously affecting production-ecology synergy. this paper, four key ecosystem services (ESs) are quantified: provisioning, water conservation (WC), soil (SC) sand fixation (SF), spatiotemporal evolution characteristics trade-offs synergies (T&S) of ESs analyzed. The driving factors...

A support vector machine (SVM) optimized by genetic algorithm (GA)-based damage identification method is proposed in this paper. The best kernel parameters are obtained GA from selection, crossover and mutation, utilized as the model of SVM. combined mode shape ratio frequency rate used input variable. numerical example for a simply supported bridge with five girders provided to verify feasibility method. Numerical simulation shows that maximal relative errors GA-SVM single, two three...

Pervious concretes, such as sustainable pavement materials, have great advantages in solving urban flooding, promoting ecological balance, and alleviating heat island effect, due to its special porous structure. However, pervious concrete typically has high porosity low strength. The insufficient strength poor freeze-thaw durability are important factors that restrict wide application, especially seasonal frozen areas. Improving the resistance of will expand application. Silica fumes, an...

Static and dynamic mechanical properties of concrete are affected by temperature effect in practice. Therefore, it is necessary to investigate the corresponding influence law mechanism. This paper demonstrates variation at temperatures from −20°C 60°C. Temperature effects on cube compressive strength, splitting tensile prism modulus elasticity, frequency conducted discussed. The results indicate that static such as strength (cube prism), elasticity have highly linear negative correlation...

Waste utilization has gained more and interest. In this study, crumb rubber diatomite were used to modify asphalt binder the short-term aging effects on properties of modified asphalts evaluated. Three kinds prepared; they are (DA), (RA), compound (DRA). Thin film oven test (TFOT) was simulate in laboratory. Penetration, softening points, ductility, viscosity, elastic recovery, low temperature creep, rutting susceptibility tested analyzed before after TFOT. The results indicated that point,...

Pervious concretes, as sustainable pavement materials, have great advantages in addressing a number of environmental issues. Fly ash, the industrial by-product waste, is most commonly used cement substitute concrete. The objective this paper to study effects waste fly ash on properties pervious was replace with equivalent volume method at different levels (3%, 6%, 9%, and 12%). control concrete modified were prepared laboratory. porosity, permeability, compressive strength, flexural...

Due to the negative effects that derive from large impervious surfaces in urban areas, pervious concrete has been developed, and become an environmentally friendly pavement material. As a porous permeable material, presents overwhelming advantage solving problems, such as flooding, groundwater decline, heat island phenomena, etc. Waste crumb rubber verified feasible modifier for The objective of this paper is explore particle size incorporation level on permeability, mechanical properties,...

Superpave gyratory compaction (SGC) and Marshall methods are essentially designed according to volumetric properties. In spite of the similarity, optimum asphalt contents (OAC) two greatly affected by laboratory process, which would further influence their performance. This study aims evaluate performance styrene-butadiene-styrene (SBS)-modified stone mastic (SMA) with basalt fiber using SGC methods. Basalt was proved improve strength basic properties SBS-asphalt test results binder. The...

Condition evaluations of old bridges are necessary for determining their health states and providing priority levels maintenance. In this paper, a novel condition evaluation approach reinforced concrete (RC) bridge superstructure is presented based on fuzzy c-mean clustering optimised by particle swarm optimisation (FCM-PSO) algorithm. It equipped with the advantages PSO algorithm in global FCM convergence acceleration, which greatly improves effectiveness clustering. Using methodology,...

The urban environment is facing serious problems caused by automobile exhaust pollution, which has led to a great impact on human health and climate, aroused widespread concern of the government public. Nano titanium dioxide (TiO2), as photocatalyst, can be activated ultraviolet irradiation then form strong REDOX potential surface nano TiO2 particles. degrade exhaust, such nitrogen oxides (NOx) hydrocarbons (HC). In this paper, photocatalytic environmentally friendly pervious concrete...

Changes of modal frequencies induced by temperature variation can be more obvious than those caused structural damage, which will lead to the false damage identification results. Therefore, quantifying effect on is a critical step eliminate its interference in detection. Due nonuniform and time-dependent characteristics distribution, it insufficient obtain reliable relationships between temperatures using air or at surface. In this paper, correlations measured (air temperature, surface mean...

The workability and mechanical properties of basalt fiber reactive powder concrete (BFRPC) were investigated by univariate analysis. acoustic emission (AE) was used as a non-destructive technique to reveal the damage characterization samples varying content. fracture stages modes specimens during flexural test determined AE parameters. content silica fume, quartz sand 0.4, 1.3 10 kg/m3, respectively, found related optimal improvements in strength. As for characteristics fracture, it that...

Porous asphalt mixtures with steel slag (PAM-SS), as an eco-friendly and low-cost pavement material, are conducive to addressing the issue of urban floods natural resource shortages. The primary objective this paper was explore feasibility application PAM-SS for seasonal frozen regions, ascertain optimal replacement percentage aggregate. Steel coarse aggregate (SSCA) used replace basalt (BCA) at four levels (25%, 50%, 75%, 100%) by equal volume. volume characteristics, mechanical properties,...

Acoustic emission (AE), as a nondestructive testing (NDT) and real-time monitoring technique, could characterize the damage evolution fracture behavior of materials. The primary objective this paper was to investigate improvement mechanism steel slag on low-temperature permeable asphalt mixtures (PAM). Firstly, coarse aggregates were used replace basalt with equal volume at different levels (0%, 25%, 50%, 75%, 100%). Then, splitting test slow loading obtain steady crack growth, initiation...