Deterioration mechanism of coral reef sand concrete under …

Coral reef sand concrete structures such as breakwaters, slopes and pavements are under the harsh and complex marine environment of high temperature, high radiation, high salt, high humidity and frequent typhoons, which are subjected to single and multi-field coupling effects of stress–temperature-chemistry for a long time, which greatly reduces their mechanical …

Sand gradation detection method based on local …

parameters, and provided a practical method to obtain representative sand particle information from 2D image analysis. With the wide application of artificial intelligence, in order to quickly ...

Desorption behavior and mechanism of chloride ions in fresh concrete …

Chloride ions are one of the leading causes of steel reinforcement rust [1], which results in the cracking of concrete covers [2] and weakens the bond between steel and concrete [3], thereby altering the mechanical properties and durability of components [4, 5].Over the past few decades, there have been several reports on engineering accidents resulting from an …

Mechanism Analysis and Experimental Study of Emulsified …

The functional mechanism of emulsified wax curing agent (EWCA) as an isolation layer of cement concrete pavement (CCP) was analyzed. Reducing the friction between layers and improving the hydrophobic function of concrete surface can weaken the combination of surface course and base course, as well as the formation of weak transition layer, which is …

Chongqing International Construction Corporation

The construction content of the project is to demolish the damaged steel structure bridge and build a new concrete structure bridge on the original site. ... (sand gates, drainage gates), accounting for 27% of the total contract value; 17 …

Research and Analysis on Present Situation of Desert …

Corresponding author:59772029@qq Research and Analysis on Present Situation of Desert Sand Concrete Ji Yanjun1; Liu Chuang1; Ding Zhichao1 (1Shaanxi Key Laboratory of Safety and Durability of Concrete Structures, Xijing University, Xi'an 710123) Abstract: Due to the rapid development of civil engineering industry, natural medium and coarse sand

(PDF) Exploring a Long-Term Mechanism of Construction

The sustainable management of construction and demolition (C&D) warrants effective policy approaches to ensure minimum waste disposal. Sustainable procurement of recycled waste resources is an ...

(PDF) Recycled concrete aggregates and their influence on concrete …

(a) Masonry products and (b) bricks used for the construction of a building (Photo source: Cape Brick, Cape Town) (a) (b) …

Feasibility assessment and application of sea sand in concrete

The challenging issue of demand for sand in concrete can be addressed by exploring alternative materials. Mechanism sand [12], aeolian sand [13], waste foundry sand [14], construction demolition waste [15], industrial by-products (such as coal ash, aged clay tailings, copper tailings) [16], [17], [18], and sea sand [19] are among the materials considered to …

Precast concrete pavements: Technology overview and technical

Precast concrete pavement offers significant advantages such as reduced on-site construction time and faster traffic opening, making it highly suitable for airport applications.

Sand gradation detection method based on local sampling

The particle size of construction sand is usually between 0.075 and 4.75 mm, and to capture images of sand below 0.15 mm requires a high-resolution camera that can only maintain a small object ...

Evaluation of the economic feasibility for the recycling of

In the paper, the economic feasibility of recycling facilities for C&D waste in China's Chongqing city was assessed. Investigations on the current situation of C&D waste recycling in Chongqing showed that there were a large quantity of waste and an enormous demand for recycled materials due to the busy ongoing construction activities, which generated a large …

Another Batch of Key Construction Projects in Chongqing Resumed

In this way, all construction progress and target nodes can be guaranteed. Moreover, the project had established an emergency handling mechanism and a health status monitoring standing book to prevent and control the COVID-19 effectively. In urban Chongqing, the branch of CRT Line 6 Phase II, Caojiawan Car Depot, had also resumed.

Deterioration mechanism of coral reef sand concrete under …

In order to reveal the damage mechanism of coral reef sand concrete, herein the effects of admixtures such as fly ash, silica fume, polypropylene fiber and basalt fiber on the anti-abrasion ...

Effect of Stone Powder Content on Mechanical Properties of …

To study the effect of stone powder content on the basic mechanical properties of mechanism sand concrete, the effect of stone powder content of 0%, 3%, 5%, 7%, 9%, 12%, and 15% on the cube compressive strength, axial compressive strength, splitting tensile strength, and modulus of elasticity of mechanism sand concrete was studied with mechanism sand in a …

Evaluation of the economic feasibility for the recycling of

The large number of C&DW generations occupy land and pollute the environment, which has become the main source of municipal waste (Zhao et al. 2010).Although C&DW recycling is the main trend of ...

Experimental and Numerical Study on Mechanical Analysis of …

Concrete pipes are widely used in municipal drainage projects. Corrosion is a common issue affecting concrete pipes, causing leakage of pipes, environmental pollution, and road collapse.

Mechanical Properties and Mechanism Analysis of Graphite …

2.2.2. Chemical Composition Analysis. The chemical composition of the aggregate is determined according to the Chinese standard (JC/T 1084-2019) [].The main components of sand were SiO 2, CaO, and Al 2 O 3, and sand also contained a small amount of Fe 2 O 3, MgO, K 2 O, and other substances ().The content of SiO 2 was the largest, accounting for nearly 70% of the total …

Multi-scale study on the durability degradation mechanism …

There is also an incomplete understanding of the influence mechanism of aeolian sand on concrete durability, especially in terms of the microscopic mechanism. Furthermore, very little attention has been paid to the degradation of the mechanical properties of ASC under F-T conditions, which severely restricts its promotion and application in ...

The use of treated desert sand in sustainable concrete: A …

Rapid urbanization and the construction of new and improved infrastructure have necessitated using huge amounts of concrete. China and India produce approximately 11.5 billion tons of concrete annually [1].Globally, over 30 billion tons of river sand are consumed each year, posing environmental threats due to the depletion of raw materials [2, 3].In 2015, around 5 …

Design Concept of the Twin River Bridges in Chongqing

In recent years, several bridges have been built to facilitate traffic through these three regions of Chongqing. Despite these efforts to relieve congestion, the rapid growth of the City continues …

Technical Codes & Specifications for Concrete and Concrete …

JGJ 3-2010 | Technical specification for concrete structures of tall building. JGJ 55-2011 | Specification for mix proportion design of ordinary concrete. JGJ 169-2009 | Technical …

Study of Early-Age Hydration, Mechanical Properties …

This study explored the potential of granite stone powder (GSP) as a supplementary cementitious material (SCM). The 72 h early hydration process stages of GSP-mixed slurry were analyzed in depth, and the mechanical properties of manufactured sand concrete (MSC) mixed with GSP were investigated. Physical phase types, morphological characteristics, and pore …

Research on Compressive Strength of Manufactured Sand Concrete …

In Figure 4 b, the trend of relative plastic viscosity of manufactured sand concrete and natural river sand concrete with time as a whole shows an increase and then decrease, but the increase and decrease in relative plastic viscosity of mechanism sand concrete is significantly earlier than that of natural sand concrete in time.

Technical Regulations for Preparation of Construction …

Technical Regulations for Preparation of Construction Drawing Design Documents of Chongqing Construction Engineering (Version 2022) January 20, 2023 January 20, 2023 …

Chongqing to Promote the Construction of National Scientific Literacy

It can achieve the goal by the end of the 14th Five-Year Plan period. This is also the basic requirement for Chongqing to accelerate the construction of an influential science and technology innovation center and a vital national talent highland, according to Wang. Agricultural technical team guides townships

People's Republic of China: Chongqing Urban- Rural …

includes: (i) construction or rehabilitation of about 362 kilometers (km) of roads through 21 road subprojects; (ii) construction and improvement of water supply systems to boost service …

Chongqing Urban-Rural Infrastructure Development …

PRC: Chongqing Urban–Rural Infrastructure Development Demonstration II Project Prepared by Fuling District Traffic-Tourism Construction Investment Group Co., Ltd. for the Asian Development Bank. This is a revised version of the draft originally posted in April 2013

Full article: Effect of stone powder and practical …

The use of MSC is expected to increase significantly in future years with the increasing quantity of concrete in construction. The manufactured sand is considered to use as a substitute of the natural sand (Pilegis, Gardner, …

BONDING BEHAVIOUR AND FAILURE MECHANISM OF …

BONDING BEHAVIOUR AND FAILURE MECHANISM OF DAMAGED CEMENT CONCRETE REPAIRED USING EPOXY-BASED CONCRETE GUOGANG YING*, CHUANHUI TANG**, ... F 40-2004 "Technical specifications for construction of highway asphalt pavements", the median value of the ... 80 % of that of the original cement concrete. When the sand-filling depth is less …