Performance Deterioration of Portland Cement Matrix Due To Magnesium Sulfate Attack  

Oleh:

Seung-Tae, Lee

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: KSCE Journal of Civil Engineering vol. 11 no. 3 (May 2007), page 157-163.
Topik: Magnesium Sulfate Attack; Ordinary Portland Cement; Gypsum; Thaumasite; XRD; SEM

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: KK25 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

This paper presents a detailed experimental study on the magnesium sulfate attack of cement matrix, and the deterioration mechanism. Experimentas were performe on paste and mortar specimens made with ordinary Portland cement conforming to ASTMC 150 type I. The water-cement rations were varied from 0.35 to 0.55. In order to indentify the reactants by magnesium sulfate attack, instrumentals analysis such as XRD and SEM were introduced in the present study. Test result showed that the formaton of gypsum and thaumasite is the main causes of the damage of the cement matrix, but not the formation of ettringite. More importantly, it was found from the laboratory study that the water-cement ratio may play a key role to determine the degree of deterioration of the cement matrix during magnesium sulfate attack. This was confirmed by the results of visual observation, expansion and compressive strength loss of mortar specimens.

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