Earthen sites, which are mainly made of earth, cultural heritages with historical, artistic and scientific values. Many extremely valuable earthen sites have been preserved in the arid areas China. The site Jiaohe Ancient City is one earliest National Protected Important Cultural Heritage Sites. exhibits all kinds deteriorations, can be found environments Through a case study ancient site, we present this paper comprehensive conservation technologies, including mud bricklaying reparation,...

Abstract Self‐desiccation is one common phenomenon of concrete with low water‐to‐cement ( w / c ) ratios, which may lead to the decrease internal relative humidity (IRH), and therefore causing autogenous shrinkage (AS). Superabsorbent polymers (SAPs) are used as a kind curing material mitigate AS concrete. The IRH significantly affected by ratio, several attempts have been made investigate or different ratios. However, prediction model considering ratio internally cured (IC) limited. In...

Geothermal reservoir rocks have the characteristics of high stress, hardness and abrasiveness, which makes drilling rate low cost high, hinders application geothermal energy. Improving efficiency in hard rock strata is prerequisite for large-scale Impact considered to be most effective method formations. PDC (Polycrystalline diamond Compact) bit compound impact one methods, has been widely concerned recent years. In order further improve this method, mechanism breaking studied....

Full-scale accelerated loading test is an efficient and effective method for simulating studying long-term pavement performance because its environment conditions are similar to those of real-world applications. In the past decades, this has been recognized as important support development design theory worldwide. 2000, long-life was first presented by researchers in Europe USA obtain most economical during whole life cycle. However, completed asphalt not provided, especially semi-rigid base...

Road material constitutive model is the essential condition of pavement structure design, calculation, and maintenance decision. Experts have conducted in-depth studies on problems proposed many meaningful models. However, these models not been summarized no uniform conclusion applicability them reported in academic circle. The linear elastic based Hooke's law still used design. This paper systematically reviewed existing that reflect materials' mechanical properties for calculation. These...

As the main cause of asphalt pavement distress, rutting severely affects safety. Establishing an accurate prediction model is crucial for maintenance, structure design, and repair. This study explores five machine learning methods, namely Support Vector Regression (SVR), Artificial Neural Network (ANN), Gradient Boosting Decision Tree (GBDT), Random Forest (RF), Extra Trees, to predict development depth using data from RIOHTRack. The model’s performance measured by comparing evaluation...

The technical orientation, pavement structure, and material design scheme of the first full-scale test track (RIOHTRACK) in China, composition testing platform, including vehicle loading data collection, etc., are introduced. RIOHTRACK has 19 kinds designed structure putting on straight transition curve, these structures cover domestic foreign engineering application cases, flexible base course, semirigid course rigid different asphalt structural layers combination modes. classified...

High percentage reclaimed asphalt pavement (RAP) is prevailing in engineering for its advantages sustainability and environmental friendliness, however, fatigue resistance remains a major concern. Fine aggregate matrix (FAM) crucial part the of mixtures with high RAP content. Hence, linear amplitude sweep (LAS) test FAM has been developed to study mixtures. However, torsional loading mode LAS dynamic shear rheometer (DSR) limitation simulate traffic load. In this paper, an alternative...

Asphalt mortar is a typical temperature-sensitive material that plays crucial role in the performance of asphalt mixture. This study evaluates high- and low-temperature based on dynamic mechanical analysis (DMA) method. Temperature-sweep tests mortars were conducted using DMA method under fixed strain level, frequency, heating rate conditions. The response curves, characteristic temperature, other indices obtained used to investigate mortar. results showed phase transition temperatures T1,...

In this paper, to track maneuvering unmanned surface vehicles (USVs) in scenarios with clutter, we propose a novel method based on the probabilistic data association (PDA) algorithm and Rao-Blackwellized particle filter (RBPF) algorithm, further improve tracking performance by Max-Q criterion-based waveform selection. This work develops target model context of integrating linear nonlinear states as well observations false alarms. order jointly tackle mixed-state problem, PDA is integrated...

The pavement skid resistance performance index is one of the most important indexes to ensure driving safety. Based on test data RIOHTrack full-scale track, this paper analyzes decay law performance, including sideway force coefficient (SFC), British pendulum number (BPN), mean texture depth measured by sand patch method (MTD) and sensor laser (SMTD), under different equivalent single axle load times (ESALs). influence methods conditions indicators excavates internal correlation indexes,...

In order to study dynamic mechanical properties of asphalt mix under two-point bend load, and the impact load level modulus, trapezoid beam method is employed conduct modulus tests on SAC13 (Stone Asphalt Concrete with nominal maximum aggregate size 13 mm). Impacts temperature, frequency material phase angle are analysed: decreases as temperature increases or decreases, while decreases. SBS polymer modifier can improve property material, a result, pavement performance mix. Master curve...

Asphalt suffers from a series of aging processes in the natural environment. This is significant factor asphalt pavement diseases. Research properties decay weathering will be helpful distinguishing characteristics various types and selection materials. Neat A70, styrene‐butadiene‐styrene‐ (SBS‐) modified asphalt, crumb‐rubber‐modified AR are exposed to outdoor conditions weather naturally. process traced by testing basic physical surface free energy asphalts, using sessile drop method....

In order to improve the accuracy and reliability of an existing rutting performance prediction model, based on long-term observation data RIOHTrack’s full-scale pavement structure, model in China’s Specifications for Design Highway Asphalt Pavement was evaluated, correction method proposed, which improves model’s makes it more suitable estimation region. The research found that has significant structural dependence. with highest smallest error is semi-rigid base asphalt structure concrete...