Effect of aggregates with high gypsum content on the performance of concrete

Temel Bulgular & Veri:Three levels of gypsum were tested (0.5, 1, 1.5) % by weight of fine aggregate and three levels of metakaolin were tested (5, 10, 15) % by the weight of cement.

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Sonuç & Katkı:The best mix ever in SCC is 1% gyp-sum with 5% metakaolin, and 1% gypsum with 10% metakaolin for HSC.

🔬Tür:Araştırma Makalesi

📍Kapsam:Genişletilmiş Akademik Örneklem

⚙️Değişkenler:Alan Parametreleri

Abstract

Sulfates in fine aggregate are a major problem when it exists in excessive amount especially in the Middle East and Iraq. Most of sulfate salts in fine aggregate are com-posed of calcium, magnesium, potassium and sodium sulfates. Calcium sulfates is the most common salt present in fine aggregate. It is usually finding as gypsum. It is diffi-cult to obtain the specific sulfates content in fine aggregate within standard specifica-tions. This research was conducted to investigate the effect of adding different con-tents of gypsum to fine aggregate as a replacement by weight on some properties of two types of concrete {self-compacted concrete (SCC) and high strength concrete (HSC)}. In these work three bases mixes of each type of concrete are used: mixes with different contents of metakaolin, mixes with different contents of gypsum and mixes incorporating different contents of metakaolin and gypsum. This study is devoted to determine the allowable content of sulfates in fine aggregate. Three levels of gypsum were tested (0.5, 1, 1.5) % by weight of fine aggregate and three levels of metakaolin were tested (5, 10, 15) % by the weight of cement. The experimental program is de-voted to produce concrete with different levels of metakaolin and gypsum and de-termine its mechanical properties such as compressive strength and splitting tensile strength. The results arrived from this work show that the optimum gypsum content was 1.5% by weight of fine aggregates for mixes of SCC which gives increases in com-pressive strength and tensile strength, and 1% gypsum for mixes of HSC, results showed also that the metakaolin improved the properties of the two types of concrete and increased the loss which caused by sulfates. The best mix ever in SCC is 1% gyp-sum with 5% metakaolin, and 1% gypsum with 10% metakaolin for HSC.

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Bu Makaleye Atıf Yap

SHAHEEN, Y. B. I., MAHMOUD, E. E., EID, F. M. (2022). Effect of aggregates with high gypsum content on the performance of concrete. Challenge Journal of Concrete Research Letters, Cilt: 8 - Sayı: 4, 96–108. https://ajindex.com/articles/473701

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Kaynakça (6)

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