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Related Concept Videos

Design Example: Sustainability in Concrete Building01:26

Design Example: Sustainability in Concrete Building

213
As the construction industry moves towards more eco-friendly practices, concrete's adaptability and its ability to incorporate sustainable features make it a key material in the drive towards greener building solutions.
There are multiple approaches to achieve sustainability in a commercial concrete building. For instance, construct a concrete parking area under the building, utilizing pervious concrete paver blocks in open areas to facilitate rainwater collection through an underground...
213
Effects of Air-entrainment in Concrete01:28

Effects of Air-entrainment in Concrete

123
Air entrainment in concrete significantly enhances the material's durability, especially in environments subjected to freeze-thaw cycles. Introducing small air bubbles into the concrete mix acts as internal voids that accommodate the expansion of water when it freezes, thereby alleviating internal stress and preventing structural cracks. This function is crucial in climates with significant freezing and thawing, as it protects the concrete from repeated stresses that could lead to premature...
123
Hot Weather Concreting01:20

Hot Weather Concreting

112
Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing.
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...
112
Pozzolans01:21

Pozzolans

171
Pozzolans are siliceous or aluminous materials blended with Portland cement. They interact with the calcium hydroxide produced during the hydration of Portland cement and contribute to improved strength and durability of concrete. The pozzolanic activity, a measure of a pozzolan's effectiveness, is typically assessed using the strength activity index, as defined in ASTM C 618-93, which calculates the ratio of the compressive strength of cement mixtures with and without pozzolan.
Fly ash is...
171
Manipulation and Analysis01:21

Manipulation and Analysis

49
GIS manipulation and analysis functions are vital for decision-making and planning. These activities range from data retrieval tasks, such as selecting information based on specific criteria, to advanced analytical techniques that address complex spatial problems.One critical GIS analysis method is overlaying, which combines multiple data layers to examine impacts. For example, overlaying a river-dammed lake boundary with road networks can identify affected infrastructure. Another common...
49
Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

108
This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
108

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Updated: Aug 16, 2025

Evaluating the Effect of Roadside Parking on a Dual-Direction Urban Street
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Does Smart City Construction Reduce Haze Pollution?

Li Wang1, Qian Xie1, Fei Xue2

  • 1School of Economics & Management, Northwest University, Xi'an 710127, China.

International Journal of Environmental Research and Public Health
|December 23, 2022
PubMed
Summary
This summary is machine-generated.

Smart city construction significantly reduces haze pollution by improving technology and environmental regulations. This initiative also lowers carbon intensity and boosts economic growth, supporting sustainable urbanization.

Keywords:
benefit analysishaze pollutionmulti-time difference-in-differencessmart city

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Area of Science:

  • Environmental Science
  • Urban Planning
  • Public Policy

Background:

  • Smart city initiatives are increasingly recognized for their potential impact on environmental governance and public health.
  • Haze pollution remains a significant environmental challenge in many urban areas, necessitating effective mitigation strategies.

Purpose of the Study:

  • To evaluate the effectiveness of smart city construction in reducing haze pollution.
  • To identify the mechanisms through which smart city initiatives impact environmental quality.
  • To analyze the heterogeneous effects and broader economic benefits of smart city development.

Main Methods:

  • Utilized panel data from 216 prefecture-level cities in China spanning 2009-2018.
  • Employed a multi-time difference-in-differences (DID) method to assess the causal impact of smart city construction on haze reduction.

Main Results:

  • Smart city construction demonstrated a significant reduction in haze pollution in pilot cities.
  • Key mechanisms include technological advancements and enhanced environmental regulatory effects leading to reduced corporate emissions.
  • Haze reduction effects were more pronounced in southern, inland, and resource-efficient cities.

Conclusions:

  • Smart city construction is an effective strategy for mitigating urban haze pollution.
  • The initiative offers co-benefits, including reduced carbon emission intensity and promotion of economic growth.
  • Findings support accelerating smart city development for sustainable urbanization and improved environmental outcomes.