Chenicheri Sid Nair, Jinrui Li and Li Kun Cai
– This paper aims to explore academics’ perspectives on the quality of appraisal evidence at a Chinese university.
Abstract
Purpose
This paper aims to explore academics’ perspectives on the quality of appraisal evidence at a Chinese university.
Design/methodology/approach
An online survey with both closed items and open-ended questions was distributed among all academics at the university (n = 1,538). A total of 512 responded to the questionnaire. The closed items were initially analysed using EXCEL and SPSS; the open-ended questions were thematically analysed.
Findings
The academics believed that the quality of student survey and peer observation of teaching were affected by subjectivity and the lack of understanding of appraisal. Academics also suggested that appraisals should be contextualised and the approach standardised. The study suggests the need for training that informs and engages relevant stakeholders to ensure the rigour of appraisal.
Originality/value
The study raises the issue of quality assurance regarding appraisal data from the perspective of academics. It is based on the collaborative effort of academics in Australia, China and New Zealand, with the support of the management staff at the case study university. The study informs both appraisers and academics of quality assurance issues in appraisal. It also contributes to the literature, in that it initiates dialogues between communities of practices through collective questioning on the quality and mechanisms of appraisal in tertiary education.
Details
Keywords
Diogo Henrique de Bem, Daniel Petzold Barbosa Lima and Ronaldo A. Medeiros-Junior
The purpose of this paper is to verify the influence of superplasticizer and air entrainment admixtures (AEs) in the electrical resistivity of concrete.
Abstract
Purpose
The purpose of this paper is to verify the influence of superplasticizer and air entrainment admixtures (AEs) in the electrical resistivity of concrete.
Design/methodology/approach
Ten different types of concrete have been studied. Three levels of superplasticizer and air AEs have been used (0.20, 0.35 and 0.50 per cent). Concrete samples were cast and the electrical resistivity was monitored at the ages of 28, 63 and 91 days. Compressive strength and density tests have also been executed.
Findings
The superplasticizer admixture presented an optimal level of 0.35 per cent that significantly increased the electrical resistivity. The air AEs at the same dosage caused a considerable decrease in the electrical resistivity. The concrete with air AEs showed highest resistivity/MPa ratio.
Research limitations/implications
The results should be carefully extrapolated for other materials and admixtures.
Practical implications
The usage of chemicals admixture in concrete is extremely common nowadays. However, only a few authors have studied the impact of such materials on the concrete’s electrical resistivity. Since many other researchers have already correlated electrical resistivity with other concrete’s properties, such as strength, setting time and corrosion probability, it is important to better understand how superplasticizers and air-entraining agents, for instance, impact the resistivity.
Originality/value
The vast majority of studies only tested the resistivity of cement paste or mortar and usually for short period of time (up to 28 days), which seems not to be adequate since the cement reaction continues after that period. This paper fills this gap and studied the impact of admixture on concrete and for a period of 91 days.