No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
Traditional sea sand desalination techniques such as natural stacking, freshwater flushing, and mechanical mixing can remove free chloride ions and physically adsorbed …
Yes, sand filtration is a low-cost and low-maintenance technology that does not require chemicals or specialized equipment, making it an environmentally friendly option for water treatment. 5. What is the difference between slow and rapid sand filtration?
In recent decades, the rapid development in China and other developing countries has increased the demand for concrete materials, depleting freshwater and river sand resources and causing environmental issues (Liu et al., 2018; Hossain et al., 2016).To address these concerns, governments have implemented policies to ban river sand mining, leading to the …
Use of Sea Sand in Partial Replacement of River Sand ... mature technology, and lower costs; the cost of sea sand is only 50-70 per cent of freshwater sand. Initial Settling ... cement mortar needs no treatment, but in case of RCC, washed sea sand is …
Slow sand filters (SSF) are a simple water treatment technology providing an important alternative to conventional drinking water treatment. SSF are extensive in terms of carbon cost and chemical use but require a large land area and are complex to operate, as periodic cleaning is required to prevent filter clogging.
The composition of sea-sand varies with the sand extraction location: Table 1 summarizes the substances typical concentrations of sea-sands extracted from different regions of the world [7], [21], [24], [28], [31]. Sea-sand contains more salt than river sand, as well as seashell particles and other potentially harmful substances.
Landfill leachate treatment technology with low cost and improved efficiency is a challenging problem for most countries around the world (Li ... washed sea sand, and firewood charcoal has resulted in overall removal efficiencies of up to 84% for BOD 5 and 73% for COD. Additionally, these systems have shown significant removal efficiencies for ...
Washing sea-sands and the process involved leads to extra cost in making concrete. Furthermore, fresh water is used for washing which is not environmentally friendly. To tackle these limitations, researchers started to …
To adequately develop the application of marine resources for island construction and effectively promote the sustainability of industrial resources, this paper investigates the feasibility of using seawater and coral or sea sand as replacements for freshwater and river sand in alkali-activated mortars (AAMs) containing ground blast furnace slag (GBFS), fly ash (FA), …
Sea sand is a widely available form of sand on comparing with the river sand. Sea sand is not used widely because it may contain chloride, sea shells in large numbers and other harmful chemicals like Fe 2 O 3, V 2 O 5, Cr 2 O 3, Ga 2 O 3, Br 2 O and Re 2 O 7.The usage of sea- sand may either address the concrete's existing problems in strength and durability or …
Seawater desalination plants that use reverse osmosis (RO) membranes have become a core part of social infrastructure, and should be designed to meet the needs of product water quality and production capacity, while considering various environmental factors such as the seawater quality, temperature and geographical features. Furthermore, stable operation while …
Utilizing seawater and sea-sand for producing ultra-high performance concrete (UHPC) can substantially reduce raw materials costs and alleviate the current freshwater and …
As can be observed,river sand cement mortars and concretes were especially suffered severe aggression under harsh environment.And shortage of river sand confined more tests on modification experiments.Sea sand and fly ash as the modified materials were more suitible for improve properties.Thus durability and mechanical properties of sea sand cement …
For each sand column, 380 g of sea sand was added to the syringe and compacted via vibration until a height of 12.5 cm was reached, at which point the sand column's density was ∼ 1.54 g/cm 3 ...
Freshwater flushing is the mainstream technology for sea sand desalination; however, the consumption of large amounts of fresh water poses a great threat to water resources. To address this challenge, sea sand concrete reinforced with non-corrosive reinforcements has been suggested as a solution (Huang et al., 2021).
Sea sand contains a large number of soluble salts, especially sodium chloride, magnesium chloride and sodium sulfate [11], [12]. ... Development of concrete made with sea water and sea sand, Building Technology. Development ... Effects of heat-treatment on physical and mechanical properties of limestone.
Seawater sea sand concrete (SWSSC) is considered a potential solution to the shortage of river sand and freshwater resources in the coastal and island regions. ... SWSSC by using high-ferrite cement instead of Portland cement and studied its performance after dry-wet cycle treatment with 5% sodium sulfate solution. SWSSC made with high-ferrite ...
The adoption of seawater and sea sand in AAMs production possesses the advantages of reducing strain on freshwater and river sand, especially in some coastal and …
Sea water and unwashed sea sand concrete construction could be used on remote islands or on the coast to reduce CO2 emission and construction costs. This paper describes the properties …
In order to directly apply seawater and sea sand in construction without desalination, a new type of circular concrete-filled steel tube (CFST) encased prefabricated …
The increasing demand for river sand, driven by infrastructure development, poses environmental challenges. The study aims to address the depletion of river sand by integrating sea sand as a fine aggregate in the production of Self-Compacting Concrete (SCC) through a Systematic Literature Review. Furthermore, it includes an in-depth bibliographic analysis of …
The development of sustainable cementitious materials is essential and urgent for the construction industry. Benefiting from excellent engineering properties and a reduced greenhouse gas footprint, alkali-activated materials (AAM) are among the robust alternatives to Portland cement for civil infrastructure. Meanwhile, concrete production also accounts for …
Preparation and Treatment of Sea Sand for Construction 1. Washing and Purification. To mitigate the adverse effects of salt and organic contaminants, washing sea sand thoroughly is essential. The process involves: Rinsing with Fresh Water: Washing sea sand with fresh water helps to remove excess salt and impurities.
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 02 | Feb 2020 p-ISSN: 2395-0072 ... Sea sand is a potential method is to use as fine aggregate ... after preliminary treatments chloride analysis are done for maximum chloride content
Therefore, rational treatment of sea-sand is required before being applied in conventional concrete. However, traditional desalination methods commonly consume large amounts of freshwater and electricity, which are in short supply in some offshore areas and island reefs, therefore, it is a great necessity to explore the application of non ...
The lack of river sand has led to the use of sea-sand and crushed stone fines in many countries, with the use of sea-sand in the UK being an example [4]. More than 90% of the world's dredged sea-sand has been used as a raw material in the construction industry, with over 45% of the dredged sea-sand being used as fine aggregate for concrete [5].
The treatment of sand grains with Si/FDTS resulted in a lower sliding angle of 9.5°, imparting self-cleaning capabilities and higher hydrophobic efficiency. The modified sea sand grains demonstrated excellent water holding and storage capabilities in long-term experiments, which could be harnessed to improve agriculture in arid regions.
Water scarcity largely threatens human survival and social development [1–3].It is estimated that more than half of the global population will face clean water shortage by 2050 as population growth and pollution worsen [4,5].Ensuring access to reliable and safe drinking water for all is a global challenge and is formally recognized as an international development priority …
The chloride binding experiment reveals that the treatment of sea sand cement-based composites with GO-CAFSS can enhance their chloride binding capacity by up to 39.5% after 14 days of exposure to NaCl solution. ... by the National Natural Science Foundations of China, NSFC-Shandong Joint Fund (No. U2006223), the Science and Technology Project ...
Furthermore, the article includes a meta-analysis of data from tests assessing the strength and fresh properties of SW-SS concretes, in published articles. Also, the effects of salts from seawater, sea sand, and coral aggregates, on the long-term durability of seawater-mixed and sea sand (SW-SS) concretes, are critically reviewed.
