Porous asphalt (PA) pavement has been widely used in the USA, Europe and Japan for benefit of quick drainage rainy days noise reduction. Its application China, however, is very limited. A PA section, therefore, was paved Yan-Tong highway Jiangsu Province as a trial. Since China no specifications design construction pavements, Construction Bureau Traffic Engineering concerned with field performances test section hope validating improving designs. Thus, five-years tracking programme launched...

In this study, microbial dynamics in the tomato rhizosphere was explored at seedling, flowering, and mature stages after soil amended with 50 mg kg −1 triiron tetrairon phosphate nanomaterials (Fe 7 (PO 4 ) 6 NMs) conventional ion fertilizer.

The interplay between root exudates and rhizobacteria is essential for enhancing agricultural productivity. Herein, the impacts of cerium dioxide nanomaterials (CeO2 NMs) on these interactions in soybean plants were investigated. Following 3-5 weeks exposure to 5 mg·kg-1 CeO2 NMs, composition changed over time, with isoflavone levels increasing by 6.3-21.7 folds, potentially manipulating rhizobacteria. Correspondingly, such as Ensifer, Allorhizobium, Nitrospira, Bradyrhizobium enriched...

Theanine, polyphenols, and caffeine not only affect the flavor of tea, but also play an important role in human health benefits. However, specific regulatory mechanism Se NMs on fat-reducing components is still unclear. In this study, synthesis Fuding Dabai (FDDB) tea was investigated. The results indicated that 100-bud weight, theanine, EGCG, total catechin, contents buds were optimally promoted by 10 mg·L−1 range 24.3%, 36.2%, 53.9%, 67.1%, 30.9%, respectively. Mechanically, photosynthesis...

Abstract The aging of asphalt concrete is mainly governed by the binder, which a naturally occurring organic hydrocarbon. Both chemical and rheological properties binder are expected to change as continues. pavement industry increasing use different recycled materials in construction rehabilitation flexible pavements preserve natural resources, save costs, reduce environmental emissions. aged from alter its characteristics new mix. In this study, 3 virgin base types (PG 64-16, PG 58-22,...

Rejuvenators are added to reclaimed asphalt pavement (RAP) binders enhance their low-temperature and fatigue performance. The effectiveness of a rejuvenator depends upon many factors, including the properties as well compatibility between base binder. thermal can vary greatly based on its chemical composition. This research focuses understanding effects rejuvenators rheological rejuvenated binders, particularly in relation critical low temperature. In this research, an extracted recovered...

Abstract Binder film thickness (BFT) plays a vital role during the design of asphalt mixture and fine aggregate matrix because BFT can exert significant effect on performance materials. However, surface area factors are affected by different specific gravities aggregates, which always ignored calculation BFT. Moreover, whether is uniformly distributed in controversial. Hence, it necessary to further study distribution materials its influence factor. This analyzed coarse parts recycled...

In this research, field slab samples were taken from an asphalt pavement in a hot climate with design life of 40 years at 2, 4, and 7 age to determine aging behavior time different depths. The binders extracted recovered evaluate the fatigue performance intermediate layer pavement. chemical rheological properties evaluated using Fourier transform infrared spectroscopy dynamic shear rheometer, respectively. included 25 mm (1 in.) open-graded 75 (2 polymer-modified layers over three lifts. is...

Nanomaterials (NMs) provide great potential for sustainable development by regulating rhizosphere processes to improve crop productivity.

The California Department of Transportation has proposed to add a low amount crumb-rubber modifier into dense-graded asphalt mixes, in addition current policies using gap- and open-graded mixes with high content rubber (around 20% by weight binder) as the surface layers. objectives are reduce landfill disposal scrap tires obtain equal or better performance compared containing unmodified binders. This paper investigated new type rubberized mix 5% 10% modifier. binder were at same grade meet...

The structure design and mechanistic calculation of inverted asphalt pavements are mainly based on linear layer elastic theory with the assumption that cement-treated subbase (CTB) is complete without cracks. This study investigates optimal combination for according to calculated critical responses considering cracks in CTB layer. A three-dimensional finite element (3D FE) model pavement a transverse crack through was developed. Four full-scale sections were built, 0.01 m wide 0.05 deep sawn...

In this study, the fatigue performance of asphalt mixtures with high reclaimed pavement (RAP) content and rejuvenating agents (RA) has been investigated at level fine aggregate matrix (FAM) mix. Fatigue tests were conducted on four mixes: FAM without RAP, 25% RAP binder replacement, two types rejuvenators. Both linear amplitude sweep (LAS) conventional time testing used. The comparison between mixes indicated that addition results in a higher stiffness faster damage rate as expected. Adding...

In this study, a three-dimensional (3D) finite element model (FEM) consisting of an asphalt concrete (AC) overlay on top jointed plain Portland cement (PCC) slabs was developed to investigate the mechanism crack initiation traffic-induced reflective cracking. Strain values at bottom AC were primary response obtained from simulation results represent damage induced in layer. Different bonding situations between two layers, traffic load locations, material properties and thicknesses layer...

This study investigated the effects of moderate daily temperature variations on reflective cracking in asphalt concrete (AC) overlays Portland cement (PCC) pavements using three-dimensional (3D) finite element (FE) modeling. The FE model consists an AC overlay top PCC slabs, followed by aggregate base and subgrade. year-round were divided into discrete groups a clustering technique each group was applied separately model. maximum stress strain values associated with variation determined used...

This paper studies the relationship between laboratory measurements of fatigue performance and fracture conventional asphalt mixtures, mixtures with reclaimed pavement (RAP), rubberized mixtures. The existing four-point bending (4PB) test was developed to evaluate pavements; however, it is not necessarily appropriate for use in routine job mix formula approval too slow expensive quality control/quality assurance (QC/QA). In this paper, semi-circular indirect tensile cracking (IDEAL-CT) were...

Abstract Plant-produced asphalt mixes can be stored in the silo for a few hours prior to being transported construction site. The undergo additional aging during storage because of high temperature silo. This is not accounted mix design process and could greatly influence properties. Additional blending between virgin recycled binder also take place containing reclaimed pavement or shingles. In this study, four were collected from different regions within California before after storage....

A two-dimensional (2D) semi-circular bending (SCB) model was constructed with the extended finite element method (XFEM) to investigate fracture performance of asphalt mixtures. The influence material properties, which include tensile strength, energy, and elastic modulus, on crack development in I-FIT SCB configuration has been examined through load–displacement curves. full factorial 64 simulation cases varying properties carried out for sensitivity analysis. results showed that could be...