Understanding forest carbon budget and dynamics for sustainable resource management ecosystem functions requires quantification of above- below-ground biomass at individual tree species stand levels. In this study, a total 122 trees (9–12 per species) were destructively sampled to determine 12 (Acer mandshuricum, Acer mono, Betula platyphylla, Carpinus cordata, Fraxinus mandshurica, Juglans Maackia amurensis, P. koraiensis, Populus ussuriensis, Quercus mongolica, Tilia amurensis Ulmus...

This study aims to develop a prefabricated flexible ultrathin overlay that can quickly and effectively repair cracks, particularly reticulation in old asphalt pavements while improving skid resistance. The consists of combination an aggregate, binder, geotextile; its unique structure results thickness only about one-third traditional overlays. Its tensile strength, resistance, flexibility, waterproofing, interlayer bonding, long-term service performance were evaluated through series tests....

This article presents a systematic review of the most cutting-edge research on precast pavement technology for first time. Firstly, is divided into two categories, cement concrete and carpeted flexible pavement, according to application in engineering. Subsequently, structural characteristics, advantages, disadvantages various systems are compared analyzed; technical problems explained; future development directions identified. In addition, text specifically mentions great contribution...

ABSTRACT To address the issues of poor temperature sensitivity and unstable storage performance in rubber asphalt, this paper proposes a formulation that blends high‐density polyethylene (HDPE) with desulfurized rubber. The goal is to develop high‐performance asphalt exhibits excellent stability. study found adding HDPE not only enhances but also significantly improves high‐temperature viscosity asphalt. modified 3% showed an increase 31.8% viscosity–temperature indices compared facilitates...

Styrene-butadiene styrene graphene oxide nanoplatelets (SBS-g-GOs)-modified asphalt was prepared by reacting thiolated GOs (GOs-SH) with SBS in using a thiol-ene click reaction. The temperature resistance and mechanical properties of asphalts were analyzed dynamic shear rheology (DSR) multiple-stress creep-recovery (MSCR) tests, which revealed that an optimum amount GOs-SH (0.02%) can effectively improve the low anti-rutting performance asphalt. Segregation experiments showed SBS-g-GOs...

In this study, two types of modified asphalts were prepared via different approaches, using as modifiers waste rubber and plastic other raw materials. One approach followed a two-step mechanism melting-blending thermal elastomers (TPE) with the materials, which included powder, plastic, styrene-butadiene-styrene, plasticizer. The second involved direct mixing asphalt mixture materials in single step. From comparison microperformance macroperformance indices asphalts, it was found that...

Through a covalent grafting reaction, octadecyl amine (ODA) was grafted on the surface of waste rubber powder (WRP) to obtain an ODA-WRP modifier, which in turn compounded with styrene-butadiene-styrene block copolymer (SBS) prepare ODA-WRP/SBS-modified asphalt. The three major indicators (i.e., dynamic shear rheometer (DSR), multi-stress creep recovery (MSCR), and separation tests) showed that 1-ODA-WRP effectively improved complex modulus (G*), elastic Modulus (G'), loss (G″) by 36.47%,...

Abstract Asphalt exhibits self‐healing ability, though at a lower rate. In this study, urea formaldehyde–epoxy resin (UFE) microcapsules were prepared using polyurea formaldehyde as the wall and epoxy core material, which in turn applied to fabricate UFE–styrene butadiene styrene modified asphalt (abbreviated UBS asphalt). Scanning electron microscopy transmission analyses revealed well‐coated have globular geometry with obvious folds wall. Ductility test showed 90% higher healing rate of...

The strain responses of asphalt pavement layer under vehicular loading are different from those falling weight deflectometer (FWD) loading, due to the discrepancies between two types loadings. This research aims evaluate and compare FWD Two full‐scale structures, namely, flexible semirigid pavement, were constructed instrumented with gauges. layers loadings measured analyzed. Except for field measurements, finite element (FE) models experimental pavements established simulate a wide range...

The metal organic framework [MIL-101(Cr)] was used as a second modifier to prepare MIL-101(Cr)-styrene-butadiene styrene (MIL-101(Cr)/SBS) modified asphalt. influence of MIL-101(Cr) addition and contents on rheological properties the amount nature fumes produced during higher temperature applications asphalt were studied. Dynamic shear rheometer multistress creep recovery tests revealed that MIL-101(Cr)/SBS exhibited better viscoelasticity, high stability, rutting resistance relative...

The mass concrete structures play a very important role in civil engineering. cracking of is regarded as one the biggest engineering problems. Therefore, it necessary for to do control analysis. Some factors should be considered crack analysis, mainly including heat releases model concrete, mechanical process temperature pipe model. Differential evolution algorithm and equivalent are adopted solve coefficient adiabatic cool water effect. In paper, stress field calculation, back analysis...

In order to understand the effect of sand type on rheological properties self-compacting mortar, four varieties sand, namely, quartz (QS), river (RS), and two kinds manufactured marked as MS-A MS-B, were studied. As part this study, sands’ particle shape parameters, such their length:width ratio roundness, determined. Mortars containing tested using slump flow test V-funnel in oven-dried (OD) saturated surface-dried (SSD) conditions identify water absorption, shape-related differences,...

In this study, heavy calcium carbonate was wet modified using a titanate coupling agent, and fabricated titanate-coupled styrene–butadiene–styrene (SBS) were used to prepare composite asphalt. Microscopic tests such as scanning electron microscopy x-ray diffraction showed that the surface wrinkle of significantly increased, enhanced crystallinity purity favorable for its compatibility with asphalt (by segregation). Viscosity (135°C) three major indicator exhibited good high-temperature...

Abstract The joint of high-voltage cable is the weakest part in whole system, and local defect middle will affect distribution internal electric field. This paper establishes a three-dimensional model by finite element simulation software based on field calculation equation Maxwell system. influence typical defects such as impurity, scratch air bubble analysed. results show that may cause distortion strength joint, which lead to deterioration insulation.

Rutting is the most common distress of asphalt pavement with a semirigid base, mainly when located on steep longitudinal slope. Previous studies have shown that shear stress leading cause rutting. Therefore, it essential to analyze distribution characteristics evaluate rutting performance. Firstly, truck speed was measured at different locations slope section. Then, calculation method improved based “systematic clustering.” The were studied under gradients, lengths, horizontal forces, and...

It has become a research hotspot to explore raw material substitutes of concrete. is important the mechanical properties self-compacting concrete (SCC) with slag powder (SP) and rubber particle (RP) replacing cement coarse aggregate, respectively. 12 kinds composite modified (CMSCC) specimens were prepared by using 10%, 20% 30% SP 30%, 40%, 50% 60% RP. The rheological properties, microstructure CMSCC investigated. Results indicate that workability, compressive strength, splitting tensile...