Closure to “Construction Cost Factors in Nigeria” by A. Uchechukwu Elinwa

Elinwa, Augustine Uchechukwu; Buba, Silas A.

doi:10.1061/(asce)0733-9364(1995)121:3(330)

Cited by 2 publications

(3 citation statements)

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“…Sawdust ash as a supplementary material for cement mortar and concrete, was used, after burning sawdust (open method), grinding and sieving, through a sieve size of 212 µm, and used in proportions of 0 % to 30 % to produce concrete cube samples that were cured for 28 days before testing to failure to obtain the compressive strength and other concrete parameters [4]. They concluded that SDA has retarding properties, and it delays the setting times of concrete.…”

Section: Mechanical Strengths Of Sawdust-ash-admixed Gum Arabic Concretementioning

confidence: 99%

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Mechanical Strengths of Sawdust-Ash-Admixed Gum Arabic Concrete

Elinwa

2021

J. Mod. Mater.

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Gum Arabic and sawdust ash were used both as an emulsifier admixture and supplementary cement material to address some of the gaps between pozzolanic and conventional concretes. Four concrete mixtures of 1: 2.24: 2.71, with a water-cement ratio of 0.5, and cement content of 370 kg/m3, was used. The concrete mixtures were designated as M-00, M-00GA, M-10GAS, and M-30GAS, signifying the control, control with gum Arabic (GA), and mix with both gum Arabic and sawdust ash (GAS), respectively. The dosage was 0.5 % of GA and the SDA replacement by wt. % was at 10 % and 30 %, respectively. The concrete samples were cured for 90 days, and tested for mechanical strengths. The results showed that adding GA alone to concrete mixture improved the mechanical strengths of the concrete and the gum Arabic acted like an accelerator. When both GA and SDA were used together in the dosage of 0.5 % with 10 % and 30 % proportions respectively, the mechanical strengths of the concrete decreased. The findings also reported that the two-third strength ratio at 28-days of curing which is used for the conventional concrete in stripping the formwork, may not be appropriate for use on pozzolanic concrete. This is because of the delay in setting times and thus, attaining the required design strength. Therefore, it is proposed to be taken at an age beyond 28 days of curing to carter for the pozzolanic effects which starts well above 28-days.

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Section: Mechanical Strengths Of Sawdust-ash-admixed Gum Arabic Concretementioning

confidence: 99%

“…% of cement and 0.5 % GA, for the compressive strength, flexural strength, and splitting tensile strengths, respectively. These replacements and dosage were established as optimum for SDA and GA in previous works [4,1].…”

Section: Numerical Equation-mechanical Strengthmentioning

confidence: 99%

Mechanical Strengths of Sawdust-Ash-Admixed Gum Arabic Concrete

Elinwa

2021

J. Mod. Mater.

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“…i. The award of contracts many years after the design were made of which the road would have deteriorated much more than it was when the rehabilitation design was carried out [13], [14]. ii.…”

Section: (₦362 Ng = $1usd Depending On Currency Fluctuations)mentioning

confidence: 99%

The Menace of Uncontrolled Trailer/Truck Loads and the Use of Weigh-In-Motion Device on Carriageways in Nigeria

Jaiye¹,

Elisha²

2020

Int. J. TDI

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Unlike in the developed countries, road rehabilitation timing has recently become a subject of consideration and attracting much attention in developing countries like Nigeria. Increase in international roughness index (IRI) on Nigerian roads corroborated this fact. This study focuses on trailer/truck loads pattern, highway regulations and standard life span of highways, annual budgetary allocations to road construction and rehabilitations, and the adoption of weigh-in-motion (WIM) device on Nigerian carriageways. The study reveals that the increase in freight movement and growth in E80s/heavy vehicles (HV) traffic on interstate roads has tripled within the last 5 years. It further revealed that the highway life span has reduced to 2 years in Nigeria, and thereby increased the national recurrent expenditure on road transport. Results from this study shows that the deplorable conditions of the national highways have resulted in the loss of about ₦175 billion to the Nigerian economy. Lastly, this setback of none implementation of weighbridges and WIM devices on Nigeria roads can be attributed to political vested interest, lack of will power and governance offered by the ruling class in the country rather than technicality.

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Closure to “Construction Cost Factors in Nigeria” by A. Uchechukwu Elinwa

Cited by 2 publications

References 0 publications

Mechanical Strengths of Sawdust-Ash-Admixed Gum Arabic Concrete

Mechanical Strengths of Sawdust-Ash-Admixed Gum Arabic Concrete

The Menace of Uncontrolled Trailer/Truck Loads and the Use of Weigh-In-Motion Device on Carriageways in Nigeria

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