Sand gradation detection method based on local …

The grading, grain shape and void ratio of sand grains are the measurement indexes of mechanism sand stipulated in the national standard "Sand for Construction".

Highly inhibited transport of dissolved thallium(I) in

Thallium contamination in water can cause great danger to the environment. In this study, we synthesized manganese oxide-coated sand (MOCS) and investigated the transport and retention behaviors of Tl(I) in MOCS under different conditions. Characterization methods combined with a two-site nonequilib …

Spatial Pattern and Influence Mechanisms of Forest Land …

This study utilized Kaizhou District, Chongqing City, a typical forest area as a case study, and used the correction method, factor method, CASA model, landscape ecology indexes, and canonical ...

Journal of the Ceramic Society of Japan 127 [8] 551-563 …

Through relative dynamic elastic modulus and carbonization depth changes, the deterioration laws of the aeolian-sand powder concrete under the coupling effects of freeze-thaw + …

Porous Asphalt Pavement Binder Performance and …

Chongqing Fengjian Expressway Co., Ltd, Chongqing 404600, China ... standards for porous asphalt pavement that are compatible with the environment and ... mechanism sand: mineral powder = 50:31:13:6, and the oil stone ratio is 4.6%. The viscosity of the asphalt is achieved by adjusting the dosage of high-viscosity additives. The main

Study on mechanism of removal of sudden Tetracycline by …

Study on mechanism of removal of sudden Tetracycline by compound modified biological sand filtration process. ... Four types of modified quartz sand (MQS) were synthesized using a composite modification approach combining surface reconstruction and chemical modification methods. ... sulfuric acid (Chongqing Chuandong Chemical Co., Ltd ...

Influencing factors and the establishment of a basin …

Ecosystems provide essential spatial carriers and services for human activities. In the 1980s, the concept of "sustainable development" emerged and has since evolved to emphasize harmonizing economic development, resource utilization, and environmental protection (Lehtonen, 2004).However, the rapid progress of socioeconomic development has …

How to design a better model for China's enhanced …

1. The scope and standards of sandbox regulation are not clear. The scope and standards of sandbox regulation are not clear at present, which makes it difficult for fintech companies to determine whether they comply with sandbox regulatory requirements in practice. 2. The rules and mechanisms of sandbox regulation are not perfect.

Chongqing Sanming Heavy Industry Co., Ltd

Based in Chongqing, committed to becoming a global reliable mining machinery enterprises ... round grain shape, high efficiency, and high quality, meeting the national standard for medium sand in Zone 2 The material screening is carried out by 8 DES-2460 horizontal screens, with dual amplitude and dual motor drive, which has high screening ...

Influential Mechanisms of Roughness on the Cyclic Shearing …

Subsequently, the particles were preliminarily sieved using a sand screening machine and then refined with a ZBSX-92 laboratory standard vibrating sieve shaker (Shaoxing Shangyu Yueda Instrument Manufacturing Co., Ltd, Shaoxing, China) employing sieve apertures of 20 mm, 10 mm, 5 mm, 2 mm, 1 mm, 0.5 mm, 0.25 mm, and 0.075 mm.

Yang XIAO | Professor (Full) | Professor | Chongqing …

The failure mechanism of biocemented sand has been largely speculated based on scanning electron microscopy (SEM) images of biocemented sand after mechanical tests.

PRDOUCTS

According to the relevant person in charge of Yibin Huafu Shuangsan Cement Building Materials Co., Ltd., the newly built high-quality limestone mine and mechanism sand production line will have an annual production capacity of 50 million tons of …

Yi YANG | PhD | Chongqing University, Chongqing | CQU

I have a broad interest and have collaborated with scholars from various disciplines. A main focus of my current research is sustainable agri-food systems under climate change.

Research on Compressive Strength of Manufactured Sand …

For the single factor, SP has the greatest effect on the compressive strength of mechanism sand concrete and SF has the least effect. ... Fine aggregates were sieved using standard sieves with nominal diameters of 0.16 mm, 0.315 mm, 0.63 mm, 1.25 mm, 2.50 mm, and 5.00 mm, and aggregates within the particle size range of 0.16 mm to 5 mm were ...

CK Asset Holdings Commits to High Standards and

CK Asset Holdings Commits to High Standards and Cooperation for Chongqing's Growth ... Yuan highlighted that Hong Kong is Chongqing's largest source of foreign investment, and the Chongqing-Hong Kong cooperation mechanism has created more favorable conditions for economic and trade collaboration.

Interface Mechanism and Splitting Characteristics of Fiber …

Glass fiber, cement, aeolian sand, and water were evenly mixed and poured into a three-valve saturator mold in five layers, and each layer was scraped and compacted 20 times to make a standard cylindrical sample with the dimensions of Φ39.1 mm × 80 mm.

Shear Mechanical Behavior of Geogrid-Reinforced …

Geogrid-reinforced calcareous sand (GRCS) is an attractive alternative to enhance the bearing capacity and stability of geotechnical structures in island and coastal areas. …

200t/h Sand Washing Zero-Emission Production Line In …

A company in Yubei, Chongqing, cooperated with Longzhong Heavy Industry to build a zero-emission production line for sand washing and recycling with an output of 200 tons per hour. …

What is the standard of mechanism sand for a concrete …

The main indicators to measure the quality of sand are: mud content, sand particle size, fineness modulus and sand hardness. 1. Mud content: According to the "Quality Standards and …

Permeability enhancement mechanism of sand‐carrying …

Permeability enhancement mechanism of sand‐carrying hydraulic fracturing in deep mining: A case study of uncovering coal in cross‐cut ... 3State Key Laboratory of Coal Mine Disaster Dynamics and Control, College of Resources and Environmental Science, Chongqing University, Chongqing, China

Seasonal urban surface thermal environment analysis based …

Rapid urbanization has caused various environmental issues, with the worsening of the urban thermal environment being a significant concern. This has a notable impact on the sustainable development of cities and the physical well-being of urban residents (Kovats and Hajat, 2008; Grimm et al., 2008; Peng et al., 2018).A study report highlights the increasing …

Permeability enhancement mechanism of sand‐carrying …

Permeability enhancement mechanism of sand-carrying hydraulic fracturing in deep mining: A case study of uncovering coal in cross-cut. Yin Shuaifeng, Yin Shuaifeng. ... College of Resources and Environmental Science, Chongqing University, Chongqing 400044, China. Email: [email protected] Search for more papers by this author. Zou Quanle ...

Shear failure mechanism and parametric study for seawater sea-sand

Shear failure mechanism and parametric study for seawater sea-sand engineered cementitious composites beams reinforced by FRP bars: Finite element analysis ... is close to 1.00, ranging between 0.99 and 1.18. The corresponding mean value and standard deviation are 1.07 and 0.06, respectively.

Analysis of the Sand-Concrete Interface Shear Behaviors …

The analysis results may provide a new research approach for revealing the shear mechanism of the sand-concrete interface. Previous article in ... R = r = V S, (1) where V is the …

The Effects of Steel Fiber Types and Volume …

Different types and amounts of steel fibers have varying effects on the improvement of concrete's mechanical properties. In order to identify the most suitable steel fiber types for the practical production of prefabricated …

(PDF) Interface Mechanism and Splitting …

Herein, the interface mechanism and splitting characteristics of fiber-reinforced, cement-solidified, aeolian sand were experimentally assessed to investigate whether glass fiber exhibits better ...

Experimental study on deformation and permeability …

nectivity, and composition of oil sands more intuitively, which can provide a basis for the analysis of dilatancy mechanism and on- site targeted dilatancy and transfor-mation measures of the extraction of heavy oil. Firstly, the oil sands were analyzed by particle size analysis, as shown in Figure 1, the oil sand particle size was mainly concen-

Chongqing Daxue Xuebao/Journal of Chongqing University

To improve the media access control mechanism and enhance the performance of large-scale wireless LANs, the distributed coordination function of IEEE802.11 standard and two typical improved ...

Sand gradation detection method based on local sampling

According to the GB/T14684-2022 standard for construction sand 37, the grading of sand should meet the requirements of three grading zones (coarse sand zone, medium sand …

Aligning with International Standards, Chongqing Launches 100 …

Recently, Chongqing issued the 2020 Implementation Plan for Improving the Business Environment in Chongqing in Line with International Advanced Standards. The Plan proposed 100 reform measures in 11 sectors focusing on cutting procedures, time, and costs, in a bid to push the business environment improvement to a new level. Zero-cost Online

Chongqing Sanming Heavy Industry Co., Ltd

The finished mechanized sand has adjustable fine-grained modulus, reasonable gradation, controlled powder content, round grain shape, high efficiency, and high quality, meeting the national standard for medium sand in Zone 2

Exploring the elliptic fissure cracking mechanisms from the …

Exploring the elliptic fissure cracking mechanisms from the perspective of sand 3D technology and Meshfree numerical strategy. ... the standard sand 3D cylindrical sample is prepared. The diameter of the sample is 50 mm and the height is 100 mm. ... Chongqing University, Chongqing (2016) Google Scholar. Bi and Zhou, 2015.

Research on Compressive Strength of Manufactured Sand …

Fine aggregates were sieved using standard sieves with nominal diameters of 0.16 mm, 0.315 mm, 0.63 mm, 1.25 mm, 2.50 mm, and 5.00 mm, and aggregates within the particle size range of 0.16 mm to 5 mm were selected. ... Based on the mechanism sand concrete compressive strength regression equation, the effect of two interactions of SP, PEA, and ...

Chongqing traffic construction mechanism sand concrete …

Chongqing to Accelerate the Construction of Inland International. By Xinyi Li, EDITOR. Chongqing needs to fully integrate into the co-construction of the Belt and Road Initiative (BRI) and the development of the Yangtze River Economic Belt, vigorously promote the construction of corridors to foreign countries, strive to build support for inland international logistics hubs, and accelerate …