Superplasticizer on steel slag mortar

What is it about?

This study aims to investigate the effect of superplasticizer dosage of 0, 0.5, 1.0 and 1.5% in SS-based mortar. The experimental included flow table test, compressive strength test, flexural strength test and water absorption characteristic.

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Photo by Collab Media on Unsplash

Photo by Collab Media on Unsplash

Why is it important?

Our work holds significant importance in addressing the environmental issues associated with the high demand for concrete, which predominantly relies on non-renewable materials like cement. We recognize the need to explore sustainable materials derived from renewable sources, aiming to promote sustainable development in the concrete industry. In this context, our research focuses on the utilization of steel slag (SS) as a supplementary cementitious material in concrete. Previous studies have highlighted the poor workability of steel slag, which limits its potential as a viable replacement for traditional cement. Therefore, we aim to investigate the effect of superplasticizer (SP) dosage on the workability of SS-based mortar. Superplasticizers are chemical admixtures commonly used to improve the fluidity and workability of concrete mixes. Through a series of experimental tests, including the flow table test, compressive strength test, flexural strength test, and water absorption characteristic analysis, we provide valuable insights into the performance of SS-based mortar with varying SP dosages. Our results demonstrate that increasing the dosage of SP significantly enhances the workability of fresh SS-based mortar. However, it is crucial to note that excessive SP dosage can lead to bleeding, which is an undesirable property in concrete. Additionally, our study evaluates the impact of SP dosage on the compressive strength, flexural strength, and water absorption rate of SS-based mortar. The findings reveal that a 1% SP dosage yields improvements in both compressive and flexural strength after a 28-day curing period, compared to the control specimen. Furthermore, the water absorption rate of SS-based mortar gradually decreases with increasing SP dosage up to 1%, but it starts to increase again when the SP dosage exceeds 1%. Overall, our experimental results indicate that an optimal dosage of 1% SP provides excellent workability and yields the highest strength of 53.6 MPa at the 28-day mark. These findings contribute to the understanding of utilizing sustainable materials like steel slag in concrete production, paving the way for more environmentally friendly and economically viable construction practices.

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