Effects of partial replacement of normal aggregates with lateritic stone in concrete

Abstract

Lateritic stones abound in the tropical and semi tropical areas of the world more than the igneous and other standard rocks that are used as concrete aggregates and road chippings. The increasing utilization of natural aggregate for concrete production have created negative impact on the environment. Therefore searching for alternative material which has potential to replace the use of coarse aggregate from normalrocks in concrete mix either wholly or partially is very much in need. This research presents the engineering properties of concrete containing lateritic aggregate as partial coarse aggregate replacement. The coarse aggregate was replaced by 10, 20, 30, 40 and 50% with lateritic aggregate. All the specimens were cured and compressive strength test were carried out at the age of 7, 14, 21 and 28 days respectively. The result revealed that replacement of lateritic aggregate up to 30% was able to produce lateritic concrete exhibiting the target strength which is 30 N/mm 2. However, the slump decreases as the percentage of lateritic aggregate in the mix increases, this may be due to the porosity of the lateritic aggregate due to absorption of the water in the mix. The result of the two way analysis of variance shows that both lateritic aggregate and curing age (days) has significant effects of the compressive strength of concrete.

Performance of high strength concrete containing locust bean pod ash as cement replacement

“…The slump values of the LBPA concrete exhibited a decline as the LBPA content increased. This finding is consistent with [22]. Because LBPA particles have a wide surface area, it is possible that their absorption of some water contributed to the decrease in workability.…”

“…Under compression, the combinations outperformed the control mix. LBPA obtained from calcination of the African Locust Bean (Parkia biglobosa); a perennial tree species native to the west African Savannah has been utilized in production of concrete and mortar [22]- [24]. Figure 1 shows locust bean tree, ripe locust bean fruit, LBP, LBPA, LBPA concrete and Universal Testing Machine.…”

“…The utilization of LBPA as SCM has been examined in numerous studies aimed at ensuring effective waste management, construction cost reduction and conservation of the environment [22], [24], [25]. Available literature reveals that concrete made with LBPA exhibits an appreciable level of strength and durability hence, it can be used to produce structural light weight concrete.…”

Effects of aggregate sizes on the performance of laterized concrete

“…In this experiment, the concrete mix is modified by substituting fine aggregate with laterite across a range of 0% to 25% in line with relevant literature studies 21 , 23 . The target strength is set at 25 N/mm 2 , and the fine aggregate contents are varied to 518, 589, and 713 kg/m 3 .…”

“…This research endeavors to delve into the profound effects of aggregate sizes on the structural properties of laterized concrete. By conducting a systematic analysis of the influence of various aggregate sizes, we aim to unravel the intricate relationships between these components and shed light on the optimal aggregate size for enhancing the performance of laterized concrete in diverse engineering applications 19 – 21 . The findings of this research hold immense significance for the construction industry, academia, and sustainable development.…”