Nanomaterials in Construction and Their Potential Impacts on Human Health and the Environment (original) (raw)
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ACS Nano, 2010
The extraordinary chemical and physical properties of materials at the nanometer scale enable novel applications ranging from structural strength enhancement and energy conservation to antimicrobial properties and self-cleaning surfaces. Consequently, manufactured nanomaterials (MNMs) and nanocomposites are being considered for various uses in the construction and related infrastructure industries. To achieve environmentally responsible nanotechnology in construction, it is important to consider the lifecycle impacts of MNMs on the health of construction workers and dwellers, as well as unintended environmental effects at all stages of manufacturing, construction, use, demolition, and disposal. Here, we review state-of-the-art applications of MNMs that improve conventional construction materials, suggest likely environmental release scenarios, and summarize potential adverse biological and toxicological effects and their mitigation. Aligned with multidisciplinary assessment of the environmental implications of emerging technologies, this review seeks to promote awareness of potential benefits of MNMs in construction and stimulate the development of guidelines to regulate their use and disposal to mitigate potential adverse effects on human and environmental health.
Inventory of Nanomaterials in Construction Products for Safety and Health
Construction workers face the possibility of exposure to nanomaterials, which are particles smaller than asbestos. Nanomaterials exposure is expected to increase in coming years because of the advantages and desirable characteristics of nanoconstruction products. The lack of knowledge and preparedness in the construction industry for this technology is apparent. There are few research studies in the United States that have evaluated the potential safety and health risks of construction nanomaterials on the construction workforce. The Center for Construction Research and Training (CPWR) has built a database containing more than 400 construction products in the United States that may contain nanomaterials. This paper investigates the nature of the nanoparticles in these construction products. Additionally, a sample of the possible safety and health hazards affecting construction workers is provided. The findings confirm the industry's lack of preparedness regarding the potential risks of construction nanomaterials, which may create or exacerbate unsafe conditions. Finally, the paper points out the necessity of communicating the potential hazards of nanoparticles to the construction workforce in contact with these products.
Construction Management and Economics
Nanomaterials offer significant potential for high performing new products in the built environment and elsewhere. However, there are uncertainties regarding their potential adverse health effects and the extent to which they are currently used. A desk study and interviews with those working across the construction, demolition and product manufacture sectors (n=59) identified the current state of knowledge regarding nanomaterial use within the built environment. Some nanomaterials are potentially toxic, particularly those based on fibres; others are much less problematic but the evidence base is incomplete. Very little is known regarding the potential for exposure for those working with nano-enabled construction materials. Identifying which construction products contain nanomaterials, and which nanomaterials these might be, is very difficult due to inadequate labelling by product manufacturers. Consequently, those working with nanoenabled products typically have very limited knowledge or awareness of this. Further research is required regarding the toxicology of nanomaterials and the potential for exposure during construction and demolition. Better sharing of the information which is already available is also required through the construction, demolition and manufacture / supply chains. This is likely to be important for other innovative products and processes in construction, not just those which use nanomaterials.
Managing the Unknown - the Health Risks of Nanomaterials in the Built Environment
2015
The application of nanomaterials, containing particles 1000 times smaller than the thickness of a human hair, is increasing but uncertainties persist regarding their potential health effects. An ongoing study to identify where nanomaterials are used in construction and to assess the impact of demolition processes on particle release has identified difficulties which arise when dealing with the unknown: assessing, and managing the risks of these, and other, new materials. The widespread use of materials whose risks are inadequately understood is clearly unsatisfactory. However, the timing of a detailed health evaluation for a new product or process is not straightforward-a focus on these aspects too early in a developmental lifecycle may derail potentially promising innovations. It is also necessary to carefully balance benefit and risk. A product with moderate risk potential may be tolerated provided there are significant benefits, and adequate control measures are available. Questions also arise regarding who should carry out and fund health risk assessments for new materials. Manufacturers clearly have responsibilities, but there are also advantages in centrally funded, objective assessment. Particular complications arise when assessing the health risks for nanomaterials in view of their wide variability and the lack of adequate exposure data. There is no requirement to label nano-enabled building materials. This makes it difficult to assess the extent of their usage, and hence also to determine the health risks to those working with them, or exposed to them due to demolition or recycling at the end of the product or building life. Manufacturers, researchers, governments and wider society share responsibility for addressing these challenges. However, there are steps which constructors can take in the interim to minimise the impact on those working with these uncertainties.
Journal of Nanoparticle Research, 2011
In the European construction industry in 2009, the use of engineered nanoparticles appears to be confined to a limited number of products, predominantly coatings, cement and concrete. A survey among representatives of workers and employers from 14 EU countries suggests a high level of ignorance about the availability and use of nanomaterials for the construction industry and the safety aspects thereof. Barriers for a large-scale acceptance of products containing engineered nanoparticles (nanoproducts) are high costs, uncertainties about long-term technical material performance, as well as uncertainties about health risks of nanoproducts. Workplace measurements suggest a modest exposure of construction workers to nanoparticles (NPs) associated with the use of nanoproducts. The measured particles were within a size range of 20-300 nm, with the median diameter below 53 nm. Positive assignment of this exposure to the nanoproduct or to additional sources of ultrafine particles, like the electrical equipment used was not possible within the scope of this study and requires further research. Exposures were below the nano reference values proposed on the basis of a precautionary approach.
Nanoparticles in Construction Materials and Other Applications, and Implications of Nanoparticle Use
Materials, 2019
Nanoparticles are defined as ultrafine particles sized between 1 and 100 nanometres in diameter. In recent decades, there has been wide scientific research on the various uses of nanoparticles in construction, electronics, manufacturing, cosmetics, and medicine. The advantages of using nanoparticles in construction are immense, promising extraordinary physical and chemical properties for modified construction materials. Among the many different types of nanoparticles, titanium dioxide, carbon nanotubes, silica, copper, clay, and aluminium oxide are the most widely used nanoparticles in the construction sector. The promise of nanoparticles as observed in construction is reflected in other adoptive industries, driving the growth in demand and production quantity at an exorbitant rate. The objective of this study was to analyse the use of nanoparticles within the construction industry to exemplify the benefits of nanoparticle applications and to address the short-term and long-term effects of nanoparticles on the environment and human health within the microcosm of industry so that the findings may be generalised. The benefits of nanoparticle utilisation are demonstrated through specific applications in common materials, particularly in normal concrete, asphalt concrete, bricks, timber, and steel. In addition, the paper addresses the potential benefits and safety barriers for using nanomaterials, with consideration given to key areas of knowledge associated with exposure to nanoparticles that may have implications for health and environmental safety. The field of nanotechnology is considered rather young compared to established industries, thus limiting the time for research and risk analysis. Nevertheless, it is pertinent that research and regulation precede the widespread adoption of potentially harmful particles to mitigate undue risk.
Potential environmental and human health impacts of nanomaterials used in the construction industry
2009
Rechargeable lithium-ion (Li-ion) and lithiumpolymer (Li-poly) batteries have recently become dominant in consumer electronic products because of advantages associated with energy density and product longevity. However, the small size of these batteries, the high rate of disposal of consumer products in which they are used, and the lack of uniform regulatory policy on their disposal means that lithium batteries may contribute substantially to environmental pollution and adverse human health impacts due to potentially toxic materials. In this research, we used standardized leaching tests, life-cycle impact assessment (LCIA), and hazard assessment models to evaluate hazardous waste classification, resource depletion potential, and toxicity potentials of lithium batteries used in cellphones. Our results demonstrate that according to U.S. federal regulations, defunct Li-ion batteries are classified hazardous due to their lead (Pb) content (average 6.29 mg/L; σ = 11.1; limit 5). However, according to California regulations, all lithium batteries tested are classified hazardous due to excessive levels of cobalt (average 163 544 mg/kg; σ = 62 897; limit 8000), copper (average 98 694 mg/kg; σ = 28 734; limit 2500), and nickel (average 9525 mg/kg; σ = 11 438; limit 2000). In some of the Li-ion batteries, the leached concentrations of chromium, lead, and thallium exceeded the California regulation limits. The environmental impact associated with resource depletion and human toxicity is mainly associated with cobalt, copper, nickel, thallium, and silver, whereas the ecotoxicity potential is primarily associated with cobalt, copper, nickel, thallium, and silver. However, the relative contribution of aluminum and lithium to human toxicity and ecotoxicity could not be estimated due to insufficient toxicity data in the models. These findings support the need for stronger government policy at the local, national, and international levels to encourage recovery, recycling, and reuse of lithium battery materials.
Nowadays, one of the most important research areas implemented in the construction industry is nanotechnology. Scientists have progressed a lot in their capability to produce substances from available materials. Nanotechnology could change the construction sector by creating new materials and providing new building technologies such as energy efficiency in the buildings and also a new technical tool which can modulate the climate changes and help us to mitigate the green house gases emissions in the future. It helps the construction sector to improve new products, and to significantly enhance the material quality. The field of building materials has had its most improvement in the characteristics of concrete, steel, glass and insulating material, including resistance, durability, reduction of pollution and etc. Generally the main causes of pollution produced in the construction field are related to the producing of different construction materials. So by using nanotechnology in materials and improving their performance, pollution in materials production will be mitigated. On the other hand, in recent years, in spite of many efforts in developing the technology by using these materials, few of them have dealt with the ecological cycle due to applying them. However, during utilizing a new technology, the negative aspects and consequences should also be considered to help us to seek ways to resolve the negative impacts. In this paper, a synopsis of the application of nanotechnology and nano-material in the construction industry and also the negative aspects and consequences of nano particles which may have on living organism have been investigated.
Emerging risk in the construction industry: Recommendations for managing exposure to nanomaterials
Nanotechnology has aroused great interest in the construction industry because new materials with outstanding properties are being designed, and the features of traditional materials can be improved. However, exposure to nanomaterials is the most recent new emerging risk in the construction industry and the current knowledge about this topic is limited. This paper aims to identify the main aspects regarding the exposure to and use of nanomaterials in the construction sector from a risk prevention perspective. This starting point allows authors to establish a set of recommendations structured in order to identify how and where to act in order to manage the risk of exposure to nanomaterial on construction sites.