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Senast inlagda
A Blind Spot in Construction: An investigation into the prevalence and perception of construction logistics management
(2024) Campbell, Erik John; van der Horst, Floris
Logistics is an integral part of any current day construction project, with a growing importance as
a result of urbanization and sustainability efforts. However, it is still unclear as to how these
logistical tasks are managed on construction sites on a daily basis. Combining data from a set of
on-site observations with qualitative data from interviews with members of site management,
logistics experts, and recruiters, we highlight the prevalence and perceptions regarding logistical
management in construction. Following which we can conclude that logistics takes up a significant
amount of supervisors’ time and effort, while not being met with requisite presence in
recruitment and job specifications. Currently logistics is often seen as an activity to enable other
work efforts, resulting it often being performed in a reactive fashion. Instead, allocating logistics
to those specialised in it or building further knowledge on how to interact with logistics, can
provide multiple benefits connected to quality, cost, and time by further planning and
streamlining logistics flows ahead of time
Hole in one: Maximising efficiency through standardised groundwork scheduling in construction
Lehiste, Nike; Ölme, Hanna
How contractors implement environmentally sustainable building: A study of compliance with environmental requirements across project organizations for municipal construction projects
(2024) Björk Filander, Linn; Mattsson, Emilia
The continuous growth of the building and construction industry contributes to
the sector accounting for one-third of all global greenhouse gas emissions. To reduce
emissions and achieve more environmental sustainability in construction, environmentally
sustainable directives must be followed globally and nationally. Today, clients are imposing
increasingly stringent environmental requirements on their projects, posing a challenge
for contractors to meet these demands and align the entire project organization towards
the same goal. The study aims to investigate how environmental requirements are followed
and complied with throughout the process of construction projects, as well as what drives
and hinders their successful fulfillment. To investigate this, a case study was conducted in
collaboration with Veidekke, focusing on two public projects located in Gothenburg, Sweden.
Relevant actors from both projects were interviewed, including subcontractors, suppliers,
site managers, and environmental managers. Furthermore, documents from
both projects, such as contracts and environmental plans, were analyzed. The study
finds that formulation and organizational issues hinder adherence to environmental
requirements in the projects. It also highlights inconsistencies and lack of clarity in
contract formulation and implementation, emphasizing the necessity of a monitoring
system and clear production follow-up procedures, with a focus on leadership. To
enhance compliance with environmental requirements in construction projects, contractors
must clearly frame environmental standards for their subcontractors and suppliers.
Early inclusion could ensure improved integration of the requirements throughout
the project. Furthermore, it is advantageous to have a responsible person in the
organization who is solely focused on environmental issues to ensure thorough
attention already from the procurement phase into the production phase. An individual
who is also responsible for monitoring routines and motivating environmental
work throughout the project organization.
Investigation of the predictability of porous ceiling absorbers with large cavities
(2024) Jonasson, Johanna
Modern construction often accommodates large installations, leading to unwanted
large air cavities between the acoustic ceiling and floor structure. This raises
concerns about the absorption coefficient of the porous absorbers and its impact
on room acoustics. Porous ceiling absorber suppliers typically do not provide data
for cavities larger than 400 mm, leading to potential inaccuracies in predicted
reverberation times and challenges in achieving optimal acoustic environments.
This study investigates the impact of large cavities above porous ceiling absorbers
by creating a model based on the transfer matrix model and Delany-Bazley’s
impedance prediction method. The model is developed to predict the absorption
coefficient of acoustic ceilings, and its accuracy is validated through measurements
and software simulations.
Even if the model is limited to calculating infinite areas and only using
Daleny-Bazley’s impedance model, which is not the most accurate, the results
show problems for the absorption coefficient with variation in the cavities and the
airflow resistivity. The results show that porous absorbers have a higher
absorption at higher frequencies and that an air gap increases the overall
absorption but has a minimal influence at high frequencies. However, increasing
the absorber’s thickness or airflow resistivity does not always result in better
absorption, especially with large air cavities. In cases with high airflow resistivity,
the absorption at low frequencies can even decrease.
The thesis also discusses the edge effect that occurs in reverberation room
measurement, positive and negative influences on the classification of absorbers,
and the challenges that building acousticians face. Further measurements and
research on mounted ceiling systems are necessary for future work. The model
needs to be developed for finite areas and with a more complex impedance
prediction method for it to be adapted to real-world scenarios.