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Evaluation of the compressive strength of soil cement blocks subjected to NPK fertilizer

Evaluation of the compressive strength of soil cement blocks subjected to NPK fertilizer

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ABSTRACT
A huge number of farmers, particularly farmers in areas, use NPK fertilizer for agricultural. These farmers lack suitable facilities for storing agricultural goods. The purpose of this investigation is to determine the compressive strength of soil cement blocks (SCB) in contact with NPK fertilizer in order to research the chemical reaction and determine the suitability of SCB for the construction of warehouses for the storage of NPK. The SCBs were acquired from a Hydraform block constructing an estate in Kuje, Abuja Local Government Area. The Kuje site yielded a total of 150 samples of the SCB, the soil utilized to generate the SCB. In accordance with BS EN 771-1: and BS EN 772-1:, the properties of the soil that influences the cement concentration and the qualities of the blocks were researched. The SCB has a shrinkage of 5.8 percent, and sieve (clay and silt 0.95 percent) shows that the cement content can be raised to improve its strength. The wet compressive strength (1.8N/mm2) was 78% of the dry compressive strength (2.3N/mm2) and below the BS EN 772-1: minimum of 80%. The cement, soil, and NPK were analyzed chemically, and a saturated solution of NPK was determined to generate various amounts. To guarantee proper exposure to the NPK solution, three randomly selected blocks were immersed for 7 days, 14 days, 21 days, 28 days, 56 days, and 90 days, respectively. The compressive strength tests demonstrate that the control behaves differently than those in the solution. hydroxide was seen to be leaching from the cement paste of the control, which had a low compressive strength of 1.64N/mm2. In contrast, the compressive strength of SCBs in NPK solution was greater after seven days (1.72N/mm2, 1.74N/mm2, 2.12N/mm2, 2.13N/mm2, 2.11N/mm2). The SCB subjected to high doses of NPK was seen to develop a white coating after 56 and 90 days. This was due to the probable ions exchange interaction between calcium hydroxide and ions. The SCB were found to be suitable for use in the construction of warehouses to store NPK fertilizer as long as the soil selection and block production followed the code and the structure was kept dry.

Evaluation of the compressive strength of soil cement blocks subjected to NPK fertilizer

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