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Related Concept Videos

Effect of Sea Water on Concrete01:22

Effect of Sea Water on Concrete

Concrete exposed to seawater can undergo degradation like the dissolution of ettringite and gypsum, increasing the material's porosity and decreasing its strength. In contrast, the crystallization of salts within the concrete's pores can cause expansion, particularly above the waterline where evaporation occurs. Nonetheless, this expansion only happens when seawater, enabled by the concrete's permeability, manages to infiltrate the structure.
Concrete in areas between tide marks, which undergo...
Refrigerators and Heat Pumps01:07

Refrigerators and Heat Pumps

Refrigerators or heat pumps are heat engines operating in a reverse direction. For a refrigerator, the focus is on removing heat from a specific area, whereas, for a heat pump, the focus is on dumping heat into one particular area. A refrigerator (or heat pump) absorbs heat Qc from the cold reservoir at Kelvin temperature Tc and discards heat Qh to the hot reservoir at Kelvin temperature Th, while work W is done on the engine’s working substance.
A household refrigerator removes heat from the...
Hot Weather Concreting01:20

Hot Weather Concreting

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,...
Mass Concreting01:22

Mass Concreting

Mass concreting refers to the process of placing large volumes of concrete, such as in gravity dams. The heat generated during the cement hydration process and differential cooling rates within the concrete mass can lead to a temperature gradient, which can result in thermal cracks in the concrete mass.
To reduce the risk of such cracking, the concrete mix may incorporate low-heat cement and pozzolans to reduce the temperature rise. Pre-cooled angular aggregates and water-reducing admixtures...
Deep Sea Microbial Ecology01:18

Deep Sea Microbial Ecology

The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...
Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

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.
To address...

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Related Experiment Video

Updated: Jun 18, 2026

Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment
06:29

Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment

Published on: February 27, 2021

Honolulu to implement cooling with deep-sea water.

Christopher Pala

    Environmental Science & Technology
    |December 4, 2009
    PubMed
    Summary

    A new system launching in 2012 aims to significantly cut operational expenses and lower greenhouse gas emissions. This innovation focuses on environmental sustainability and cost reduction in industrial processes.

    Area of Science:

    • Environmental Engineering
    • Industrial Process Optimization

    Background:

    • The development of novel systems is crucial for addressing the dual challenges of economic efficiency and environmental impact.
    • Traditional industrial processes often incur high operational costs and contribute significantly to greenhouse gas emissions.

    Discussion:

    • The system's design targets a reduction in both financial expenditure and the release of harmful gases.
    • Implementation in 2012 is anticipated to yield measurable improvements in environmental performance and cost savings.

    Key Insights:

    • The primary objective is to achieve substantial reductions in greenhouse gas emissions.
    • Cost-effectiveness is a core design principle, aiming for significant operational savings.

    Outlook:

    Related Experiment Videos

    Last Updated: Jun 18, 2026

    Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment
    06:29

    Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment

    Published on: February 27, 2021

    • Future iterations may explore broader applications across various industrial sectors.
    • Continued monitoring and analysis will be essential to validate long-term benefits and identify further optimization opportunities.