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Related Concept Videos

Retarders01:19

Retarders

326
Retarders are chemical admixtures designed to extend the setting time, which is especially useful when there is a delay in sequential concrete pours to prevent cold joints and to achieve a cohesive structure. Retarders, when used in appropriate amounts, can also enhance the architectural appearance of exposed aggregate finishes.
The function of retarders is to delay the setting of concrete, and this effect can be measured using a penetration test. The retardation process involves adding...
326
Hot Weather Concreting01:20

Hot Weather Concreting

379
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,...
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Preplaced Aggregate Concrete01:29

Preplaced Aggregate Concrete

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Preplaced aggregate concrete is ideal for construction environments that are not easily accessible. The process begins by properly wetting the gap-graded coarse aggregates to remove the dirt, then placing it in the form and compacting it. Voids are filled with a mortar mix pumped under pressure through slotted pipes. This mortar typically consists of Portland cement, pozzolan, fine aggregates, water, and a fluidizing aid. The pozzolan helps reduce bleeding and segregation while improving the...
478
Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

376
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.
376
Effects of Creep01:25

Effects of Creep

594
Creep in concrete, the gradual deformation under prolonged stress, significantly impacts the integrity of structures. For reinforced concrete beams, it can be a vital design consideration, as it increases deflection, sometimes necessitating additional design measures. In columns, especially slender ones under eccentric loads, creep can cause buckling, compromising their stability. However, creep can be beneficial in indeterminate structures by mitigating stresses that arise from shrinkage,...
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Mixing Time01:19

Mixing Time

566
The concept of mixing time is significant in producing a uniform concrete mix with the required strength. The mixing period starts once all components are in the mixer. Initially, the mixer is charged with 10% of the water, followed by the consistent addition of solids and then 80% of the water. The remaining water is added later, within the first quarter of the mixing period. The minimum mixing time varies according to the mixer's capacity; for example, mixers with up to 1 cubic yard...
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Measuring Delay Discounting in Humans Using an Adjusting Amount Task
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Analyzing delay causes in Egyptian construction projects.

Mohamed M Marzouk1, Tarek I El-Rasas1

  • 1Structural Engineering Department, Faculty of Engineering, Cairo University, Egypt.

Journal of Advanced Research
|February 17, 2015
PubMed
Summary
This summary is machine-generated.

Construction delays in Egypt are frequently caused by issues identified through expert interviews and surveys. This study pinpoints the top ten causes to help prevent disputes and litigation in civil engineering projects.

Keywords:
Construction delaysConstruction managementDisputes and litigationStatistical analysis

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Area of Science:

  • Civil Engineering
  • Construction Management
  • Project Management

Background:

  • Construction delays are a persistent issue in Egyptian civil engineering, often resulting in disputes and litigation.
  • Analyzing the root causes of these delays is crucial for project success and dispute resolution.

Purpose of the Study:

  • To identify and rank the primary causes of construction delays in Egypt.
  • To provide a data-driven roadmap for prioritizing delay mitigation strategies.

Main Methods:

  • Literature review to compile a comprehensive list of potential delay causes.
  • Expert interviews and a questionnaire survey distributed to 33 construction professionals.
  • Calculation of Frequency, Severity, and Importance Indices to rank delay factors.
  • Analysis of Variance (ANOVA) for statistical validation of delay cause groups.

Main Results:

  • The top ten construction delay causes in Egypt were identified and ranked using calculated indices.
  • A case study was analyzed and compared against the identified major delay causes.
  • Statistical analysis confirmed significant differences among certain delay cause groups.

Conclusions:

  • The research provides a prioritized list of construction delay causes specific to the Egyptian context.
  • The findings offer valuable insights for stakeholders to implement targeted mitigation strategies.
  • A roadmap for prioritizing delay causes is presented to enhance project delivery and reduce disputes.