Investigation of Carbonation of Concrete Based on Crushed Sand and Admixtures — Oak Academic Publishing
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Investigation of Carbonation of Concrete Based on Crushed Sand and Admixtures
Laboratory of Civil and Mechanical Engineering, Department of Civil Engineering, National Advanced School of Engineering of Yaounde 1, Yaounde, Cameroon
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Laboratory of Mechanics and Materials of Civil Engineering, Department of Civil Engineering, CY Cergy Paris University, Paris, France
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Department of Textile and Leather Engineering, National Advanced School of Engineering of Maroua, Maroua, Cameroon
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Department of Civil Engineering, National Advanced School of Public Works, National Advanced School of Engineering of Yaounde 1, Yaounde, Cameroon
1 Laboratory of Civil and Mechanical Engineering, Department of Civil Engineering, National Advanced School of Engineering of Yaounde 1, Yaounde, Cameroon
2 Laboratory of Mechanics and Materials of Civil Engineering, Department of Civil Engineering, CY Cergy Paris University, Paris, France
3 Department of Textile and Leather Engineering, National Advanced School of Engineering of Maroua, Maroua, Cameroon
4 Department of Civil Engineering, National Advanced School of Public Works, National Advanced School of Engineering of Yaounde 1, Yaounde, Cameroon
Carbonation is a natural aging process that occurs in all types of concrete. One of its primary implications is the acceleration of steel corrosion caused by the phenomena of depassivation. The goal of this research is to investigate the carbonation of quarry sand-based concrete. The concrete is made of 100% crushed sand 0/6.3, gravel 8/15, and 15/25 from the Arab Contractor quarry in Nomayos, Cameroon, with CEM II B-P 42.5 R from CIMENCAM (Cimenteries du Cameroun). The study employed two admixtures: one with a dual superplasticizing and reducing action (Sikamen) and another with a water-repellent effect (Sika liquid). Carbonation was performed on concrete samples at the following dates: 0, 7, 14, 28, 56, 90, 180 days, one year, and six months. Carbonated concrete (CC) and non-carbonated concrete (NCC) samples are compared in terms of their physical attributes and mineralogical characteristics. The results of this investigation reveal that after more than a year and six months of carbonation, porosity decreases and permeability increases. Despite the high fineness modulus of quarry sand, the compressive strength of quarry sand-based concrete is satisfactory. Carbonation depth is relatively high on some dates, exceeding the minimal cover value for concrete reinforcement. Sikament additive increases concrete compactness and durability while decreasing permeability. Sika water repellant mixes with the lime in cement to generate complimentary crystallizations that block the mortar’s capillaries, making it watertight.
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