Fly ash-based eco-friendly geopolymer concrete: A critical review of the long-term durability properties

Recycled powder (RP) is the main by-product in the reclamation of construction and demolition (CD in addition, improvement methods and a benefit evaluation of RP concrete are further introduced. Based on statistical data that describe the activity index of RP and the compressive strength of RP concrete, the median diameter and replacement ratio of RP in concrete preparation should be below 30 μm and 30%, respectively. The use of RP improves the durability of concrete when the RP fineness is superior to the cement fineness. Increasing the RP fineness is an effective approach to improving the properties of RP concrete, and a CO2-curing treatment of RCP is an eco-friendly modification method. Furthermore, the use of RP in concrete has good economic and environmental benefits. Therefore, one expects that this review helps the further use of RP in concrete.

The utilization of eco-friendly recycled powder from concrete and brick waste in new concrete: A critical review

The past and future of sustainable concrete: A critical review and new strategies on cement-based materials

Use of recycled plastic as fine aggregate in cementitious composites: A review

https://ujcontent.uj.ac.za/vital/access/services/Download/uj:21226/SOURCE1

A review on effects of curing, sheltering, and CO2 concentration upon natural carbonation of concrete

The thermal conductivity (k-value) of cement-based materials like concrete is an important factor when considering the amount of heat transfer through conduction. The amount of heat loss through walls and roofs has a direct effect on the energy consumption of buildings. The steady state and transient methods are considered the two main thermal conductivity measurement approaches. The moisture content, temperature, type of aggregate, type of cementitious material and density of concrete are influential factors on the thermal conductivity. The aim of this paper is to review the techniques most commonly used to measure the thermal conductivity of concrete as well as to consider the factors affecting the thermal conductivity of cement-based materials. In addition, a general equation for predicting the thermal conductivity of concrete is proposed in this study based on data reported by researchers. The results of this review indicate that most researchers have measured the k-value of cement-based materials based on transient methods. The reported k-value in saturated conditions is higher than in dry conditions. Moreover, the measured k-value exhibits a declining trend with increasing temperature. It is concluded that using lightweight concrete in structural and non-structural building envelopes is a valuable method of reducing the amount of heat transfer and energy consumption owing to the lower k-value of lightweight concrete compared to normal weight concrete.

Thermal conductivity of concrete – A review

Introducing an effective curing method for mortar containing high volume cementitious materials

Background Engaging students in the e-learning development process enhances the effective implementation of e-learning, however, students' priority on the topics for e-learning may differ from that of the educators. This study aims to compare the differences between the students and their educators in prioritising the topics in three healthcare curricula for reusable e-learning object (RLO) development. Method A modified Delphi study was conducted among students and educators from University Malaya (UM), Universiti Putra Malaysia (UPM) and Taylor's University (TU) on three undergraduate programmes. In Round 1, participants were asked to select the topics from the respective syllabi to be developed into RLOs. Priority ranking was determined by using frequencies and proportions. The first quartile of the prioritised topics was included in Round 2 survey, which the participants were asked to rate the level of priority of each topic using a 5-point Likert scale. The mean score of the topics was compared between students and educators. Result A total of 43 educators and 377 students participated in this study. For UM and TU Pharmacy, there was a mismatch in the prioritised topics between the students and educators. For UPM, both the educators and students have prioritised the same topics in both rounds. To harmonise the prioritisation of topics between students and educators for UM and TU Pharmacy, the topics with a higher mean score by both the students and educators were prioritised. Conclusion The mismatch in prioritised topics between students and educators uncovered factors that might influence the prioritisation process. This study highlighted the importance of conducting needs assessment at the beginning of eLearning resources development.

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Prioritising topics for developing e-learning resources in healthcare curricula: A comparison between students and educators using a modified Delphi survey.

Post Construction Assessment (PCA) provides critical feedback for project stakeholders to be able to evaluate and design construction processes as well as building maintainability. This paper aims to evaluate the problems caused by indoor environmental quality (IEQ) contaminants, particularly mold growth during PCA in a newly built hospital and to identify the potential solutions. Mold growth risk analysis which is a part of IEQ monitoring during PCA has not been widely emphasized, and thus leads to the creation of uncertainties in many new public hospitals in Malaysia. IEQ exercises were not prioritized during PCA not until when new mold growth occurred and were alleviated. Questionnaires were distributed to hospital projects’ stakeholders to identify the criteria of PCA with regards to mold growth in the new hospital’s indoor air. Results showed that post construction defects coupled with building design and construction quality as well as building operational issues was significant criteria that should be evaluated during the PCA of a newly built hospital. Stakeholders’ firm viewpoint on the key criteria is to be applied as a valuable input for identifying possible solutions as significant inputs in PCA for a newly built hospital.

Zahiruddin Fitri Abu Hassan

Papers

Thermal conductivity of concrete – A review

Introducing an effective curing method for mortar containing high volume cementitious materials

Prioritising topics for developing e-learning resources in healthcare curricula: A comparison between students and educators using a modified Delphi survey.

Mold Growth Risk in a Newly Built Hospital Building in Malaysia â€“ Problems and Solutions

Building pathology, maintenance and refurbishment