| dc.contributor.author | Musyimi, Festus Ngui | |
| dc.contributor.author | Wachira, Jackson Muthengia | |
| dc.contributor.author | Thiong’o, Joseph Karanja | |
| dc.contributor.author | Marangu, Joseph Mwiti | |
| dc.date.accessioned | 2020-11-12T10:14:33Z | |
| dc.date.available | 2020-11-12T10:14:33Z | |
| dc.date.issued | 2019 | |
| dc.identifier.citation | Ngui Musyimi, F., Wachira, J. M., Thiong’o, J. K., & Marangu, J. M. (2019). Performance of Ground Clay Brick Mortars in Simulated Chloride and Sulphate Media. Journal of Engineering, 2019, 6430868. https://doi.org/10.1155/2019/6430868 | en_US |
| dc.identifier.uri | https://doi.org/10.1155/2019/6430868 | |
| dc.identifier.uri | http://repository.must.ac.ke/handle/123456789/181 | |
| dc.description.abstract | The durability of cement-based structures majorly depends on their resistivity to the aggressive media in the construction environment. The most aggressive ions commonly encountered in construction environment are chloride (Cl− ) and sulphate (SO42− ). The interactions of these ions with hydrated cement influence their durability and ultimate service life. This paper reports the experimental findings on an investigation on the diffusivity of Cl− and SO42− ions into mortars made from two mixtures: one made from ground calcined clay bricks (GB) and commercial ordinary Portland cement (OPC) and the other consisting of GB and Portland pozzolana cement (PPC). The test media were 3.5% Cl− and 1.75% SO42− solutions. For comparison, commercial OPC and PPC were also investigated. GB was blended with OPC at replacement levels of 25, 35, 45, and 50% to make OPCGB. Similar blends were also made with PPC replacement levels of 15, 20, and 25% to make PPCGB. Mortar prisms measuring 160 mm × 40 mm × 40 mm were cast at the water-to-cement ratios (w/c) of 0.40, 0.50, and 0.60 using each category of cement and cured in water for 3, 7, and 28 days. Compressive strength measurements were taken at each of the curing ages. The 28-day cured mortar prisms were subjected to compressive strength analysis and accelerated Cl− and SO42− ingress for 36 hours at 12 V. Ion profiling was done on the mortars, and diffusion coefficients of the Cl− and SO42− ions were approximated. The results showed that there was an increase in compressive strength after exposure to Cl− and SO42− ions. In addition, the ingress of Cl− and SO42− ions decreased with an increase in depth of cover. Blended cement exhibited lower Cl− and SO42− ingress than OPC. The ingress of Cl− was observed to be higher than that of SO42− ions. The ingress of Cl− and SO42− ions increased with an increase in w/c ratio. The results further showed that there was a drop in the ingress of Cl− and SO42− ions with an increase in replacement up to 35 percent for OPC. A 15 percent replacement showed a better compressive strength development compared with 20 and 25 percent replacement for PPC. Blended cement showed lower apparent diffusion coefficients (Dapp) compared with OPC. PPC, OPCGB-35, and PPCGB-15 exhibited similar performance in terms of strength development, aggressive ions ingress, and Dapp. In conclusion, it was found that the test cements, PPCGB-15 and OPCGB-35, can be used in similar tested environments as commercial PPC. | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | Hindawi | en_US |
| dc.title | Performance of Ground Clay Brick Mortars in Simulated Chloride and Sulphate Media | en_US |
| dc.type | Article | en_US |
