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Surveying near highways, rough terrain, or power lines involves significant risks. Working along highways is particularly dangerous and requires the use of warning signs and flagmen. It is safest to avoid working directly on roads and use offsets whenever possible. When highway work is unavoidable, it must follow all safety guidelines. Surveyors should wear bright clothing, such as orange reflective vests, to ensure visibility to motorists, coworkers, and hunters. In construction zones, wearing...
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Design Example: Managing Concrete Workability01:14

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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.
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Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
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Preplaced Aggregate Concrete01:29

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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...
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Workability of Concrete01:25

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The workability of concrete is a crucial property that affects its handling, placing, and finishing during construction. It describes the ease with which concrete can be mixed, placed, compacted, and finished. Workability is primarily concerned with the concrete's movement and its ability to resist internal friction and external resistance from molds and reinforcements during the application process.
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The hazard rate, also known as the hazard function or failure rate, is a statistical measure used to describe the instantaneous rate at which an event occurs, given that the event has not yet happened. From a probabilistic perspective, it represents the likelihood that a subject will experience the event in a very small time interval, conditional on surviving up to the beginning of that interval. In terms of frequency, the hazard rate can be viewed as the ratio of the number of events to the...
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Design and Construction of an Urban Runoff Research Facility
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Prospective safety performance evaluation on construction sites.

Xianguo Wu1, Qian Liu1, Limao Zhang2

  • 1School of Civil Engineering & Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China.

Accident; Analysis and Prevention
|March 10, 2015
PubMed
Summary
This summary is machine-generated.

This study introduces a Structural Equation Modeling (SEM) approach for evaluating construction site safety performance. Findings show current safety levels are fair or above, urging continuous improvement for enterprises.

Keywords:
Case studyConstruction safetyQuestionnaire surveySafety performance evaluationStructural equation model

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Area of Science:

  • Construction Management
  • Occupational Safety and Health
  • Structural Equation Modeling

Background:

  • Construction sites face ongoing challenges in ensuring prospective safety performance.
  • Understanding causal relationships between safety enablers and goals is crucial for effective evaluation.
  • Existing methods may not fully capture the complexities of safety performance in diverse enterprise contexts.

Purpose of the Study:

  • To develop and validate a systematic Structural Equation Modeling (SEM) approach for Prospective Safety Performance Evaluation (PSPE) in the construction industry.
  • To analyze the causal relationships between factors influencing PSPE.
  • To compare safety performance levels across different types of construction enterprises in China.

Main Methods:

  • A systematic SEM-based approach was developed for PSPE.
  • Data collected from 450 valid questionnaire surveys across 30 Chinese construction enterprises.
  • A 26-item SEM model was established and verified using goodness-of-fit tests.
  • Analysis included comparisons across state-owned, private, and Sino-foreign joint venture enterprises.

Main Results:

  • The established SEM model demonstrated good fit for PSPE in the Chinese construction industry.
  • Overall safety performance was rated at least Level III (Fair) across surveyed enterprises.
  • Significant differences in safety performance practices were observed among different enterprise categories (ownership, scale, strategy).

Conclusions:

  • The SEM approach provides a robust framework for understanding and improving construction safety performance.
  • The construction industry exhibits a maturing safety landscape, yet continuous improvement is necessary for competitiveness.
  • Insights into cause-effect relationships facilitate targeted interventions for enhancing high safety performance.