Evaluation of Jebel Marra Volcanic Ash as Supplementary Cementitious Material for Use in Blended Cements

Abstract

The increasing cost and scarcity of portland cement has impacted negatively on the delivery of affordable housing and infrastructural development in many parts in Sudan, especially in Darfur. This paper focused on the evaluation of the pozzolanic characteristics of the volcanic ash obtained from Jebel Marra (mountains) west of Sudan as potential Supplementary Cementitious Materials for use in blended cement and concrete. The study investigated the chemical, physical, and mineralogical characteristics of the volcanic ash and its reactivity toward lime and cement, in addition , the compressive strengths of blended mortar containing volcanic ash in percentage addition were tested at 7, 28, and 90 days. X-Ray Fluorescence and X-ray diffraction techniques were used for chemical and mineralogical analysis respectively. The results of the chemical analysis showed that the sum oxides of Silica, Alumina and Iron were 83.75%. The strength reactivity with lime was 4.2Mpa, while the 28-days compressive strengths for the replacement level with cement 10%, 20%, 30%, 40%, and 50% were 38.9, 35, 29.33, 28.64, and 25 Mpa respectively, against 41.33Mpa., for the control mix. These results indicated that the Jebel Marra Volcanic Ash possesses pozzolanic characteristics and is thus potential cementitious material for use in blended cement.

Chloride Diffusion in Cementitious Pastes: Comparative Study between OPC and Blended Cements Containing Natural Pozzolana and Slag

“…The NP of Bayoda desert in Northern Sudan [8] when mixed as partial replacementof cement, Mechanical strength tests confirmed the actual behavior of the Bayoda pozzolana blended cement substitution of OPC with the samples, gave better strength development results in comparison with OPC specimen. There are several short-term investigation on Sudanese Natural Pozzolanas (SNP) [8]- [10] most of them are limited to compressive strength, also there are classification respect to shrinkage, physical and chemical properties of the SNP. There is a need to investigate the NP role in durability of concrete, namely, resisting chloride and sulphate attacks on concrete, especially there are no local industrial pozzolanic materials to improve durability in materials in Red Sea coastal structures, as well as, some effluent sewer works in Industrial Khartoum area.…”

The Effects Of Volcanic Ash On The Strength And Permeability Mortar

“…The usage of volcanic ash Gamalama mountain added materials can improve the properties of concrete [4]. The usage of volcanic ash of Jebel Marra on mortar mix will increase the performance [5]. Volcanic ash is a material that released from the bowels of the earth when volcanic eruptions occur, volcanic ash can be transported by wind and water to a great distance from the volcano's location.…”

Resilience to Sudden Climate Change: The Impact of the Bromo 2010 Volcanic Ash Eruption on the Growth of Chillies

“…Thirty-three precents BVA was optimal for productivity. This might be unique to BVA, such as in the retention capacity and in the ability to fix elements [32]. An increase of BVA could lower nutrition and micro nutrients.…”