This study investigated the compressive strength performance of cement mortar commonly used in Nigerian building construction, focusing on the influence of cement-sand mix proportions and curing age on structural suitability. Portland Limestone Cement (PLC) Grade 32.5, locally sourced river sand, and potable water were used to replicate standard residential construction practice in Nigeria. Laboratory characterization confirmed that both the cement and fine aggregate satisfied relevant standards, including NIS 444-1 (2017), BS EN 196-1:2016, and BS EN 12620:2002+A1:2008. Twenty-seven mortar prism specimens were prepared using three mix ratios (1:3, 1:4, and 1:6) and tested for compressive strength at 7, 14, and 28 days in accordance with BS EN 1015-11. Results showed progressive strength gain with curing age for all mixes. The 1:3 mix achieved the highest 28-day compressive strength of 13.68 N/mm², followed by the 1:4 mix with 10.24 N/mm², while the 1:6 mix recorded the lowest value of 5.92 N/mm². Assessment using ASTM C270 mortar classification standards revealed that the 1:3 mix satisfied the requirement for Type S mortar, making it suitable for structural and load-bearing masonry applications. The 1:4 mix met the Type N requirement and was considered adequate for general masonry and plastering works, whereas the 1:6 mix, although marginally meeting the minimum Type N strength, was deemed unsuitable for reliable structural masonry and recommended only for rendering and non-structural plastering. Statistical analysis using one-way ANOVA confirmed that both mix proportion and curing age significantly affected mortar compressive strength at a 5% significance level. The study concluded that a 1:3 cement-sand ratio should be adopted as the minimum standard for structural masonry in Nigeria, while 1:4 is appropriate for general building applications and 1:6 should be restricted to non-structural uses.
Table of Contents
1. Introduction
1.1 Background to the Study
1.2 Statement of the Problem
1.3 Aim of the Study
1.4 Objectives of the Study
1.5 Research Questions
1.6 Research Hypothesis
1.7 Significance of the Study
1.8 Scope of the Study
1.9 Limitations of the Study
1.10 Operational Definition of Terms
2. Literature Review
2.1 Introduction
2.2 Conceptual Review
2.2.1 Concept of Cement Mortar
2.2.2 Constituent Materials and Their Roles in Mortar
2.2.3 Mortar Types and Classification
2.2.4 Compressive Strength as a Performance Index
2.3 Theoretical Review
2.3.1 Hydration Theory and Strength Development in Cement Mortar
2.3.2 Water-Cement Ratio Theory
2.3.3 Abrams' Generalised Strength Law for Composite Materials
2.4 Historical Review
2.4.1 Historical Development of Mortar in Construction
2.4.2 Historical Development of Building Standards in Nigeria
2.5 Empirical Review
2.5.1 Compressive Strength of Cement Mortar under Varying Mix Proportions
2.5.2 Influence of Fine Aggregate Quality on Mortar Compressive Strength
2.5.3 Influence of Cement Quality and Brand on Mortar Strength in Nigeria
2.5.4 Effect of Curing Age on Mortar Compressive Strength
2.5.5 Mortar Performance in the Context of Nigerian Building Failures
2.5.6 Supplementary Cementitious Materials and Mortar Performance
2.6 Compressive Strength Standards for Cement Mortar in Nigeria and Internationally
2.7 Gap in Literature
2.8 Summary of Chapter
3. Materials and Methods
3.1 Introduction
3.2 Research Design
3.3 Materials
3.3.1 Portland Limestone Cement (PLC) Grade 32.5
3.3.2 Fine Aggregate (River Sand)
3.3.3 Mixing Water
3.3.4 Summary of Materials and Preliminary Tests
3.4 Laboratory Equipment
3.5 Experimental Programme
3.5.1 Mix Proportions
3.5.2 Testing Schedule
3.6 Experimental Procedure
3.6.1 Preliminary Material Characterisation
3.6.2 Batching of Materials
3.6.3 Mixing of Mortar
3.6.4 Moulding and Compaction of Specimens
3.6.5 Demoulding and Curing
3.6.6 Compressive Strength Testing
3.7 Data Collection and Recording
3.8 Data Analysis
3.8.1 Descriptive Statistics
3.8.2 Compliance Assessment
3.8.3 Hypothesis Testing
3.9 Quality Assurance Measures
3.10 Summary of Chapter
4. Results and Discussion
4.1 Introduction
4.2 Preliminary Material Characterisation Results
4.2.1 Portland Limestone Cement Tests
4.2.2 Fine Aggregate (River Sand) Tests
4.3 Compressive Strength Test Results
4.3.1 Individual Specimen Results
4.3.2 Mean Compressive Strength Results
4.4 Comparative Analysis of Compressive Strength Results
4.4.1 Effect of Mix Ratio on Compressive Strength
4.4.2 Effect of Curing Age on Compressive Strength
4.5 Compliance Assessment Against Standards
4.6 Hypothesis Testing
4.6.1 Test of Hypothesis One: Effect of Mix Ratio on Compressive Strength
4.6.2 Test of Hypothesis Two: Effect of Curing Age on Compressive Strength
4.7 Discussion of Findings
4.8 Summary of Chapter
5. Conclusions, Recommendations, and Contributions to Knowledge
5.1 Introduction
5.2 Summary of the Investigation
5.3 Conclusions
5.3.1 Conclusion on the Aim of the Study
5.3.2 Conclusion on Objective One: Literature Review
5.3.3 Conclusion on Objective Two
5.3.4 Conclusion on Objective Three:
5.3.5 Conclusion on Research Hypotheses
5.3.6 Overall Conclusion
5.4 Recommendations
5.4.1 Recommendations for Building Practitioners and Site Technicians
5.4.2 Recommendations for Regulatory and Professional Bodies
5.4.3 Recommendations for Academic Institutions and Researchers
5.5 Contributions to Knowledge
5.6 Limitations of the Study Revisited
5.7 Suggestions for Further Research
5.8 Summary of Chapter
Research Objectives and Themes
This study aims to evaluate the compressive strength performance of cement mortar used in Nigerian construction to establish evidence-based mix proportions that meet international standards and improve building quality. The research addresses the persistent issue of building failures in Nigeria by providing laboratory-verified data for commonly used mortar mixes.
- Compressive strength evaluation of cement mortar under local Nigerian conditions.
- Impact of different cement-sand mix ratios (1:3, 1:4, 1:6) on structural performance.
- Influence of curing age (7, 14, and 28 days) on mortar strength development.
- Assessment of compliance with building standards such as ASTM C270 and NIS 444-1.
Excerpt from the Book
1.1 Background to the Study
Construction materials constitute the very foundation upon which safe, durable, and functional buildings are erected. Among these materials, mortar occupies a position of central importance in virtually every phase of building construction. Mortar is a workable paste, primarily composed of cement, sand (fine aggregate), and water, that binds together structural elements such as blocks, bricks, and stones, while also serving as a surfacing material in plastering, rendering, and floor screed operations. When hardened, mortar contributes directly to the load-bearing capacity, weather resistance, and long-term durability of the building envelope. A deficiency in mortar quality, therefore, is not a minor construction imperfection it is a structural vulnerability.
Cement mortar specifically refers to the mixture of Ordinary Portland Cement (OPC) or Portland Limestone Cement (PLC) with fine aggregate and water. In Nigeria, PLC designated as CEM II under NIS 444-1 (2017) is the most commonly available cement in the open market (Joeland & Mbapuun, 2016). There are three standard grades of cement in Nigeria grades 32.5, 42.5, and 52.5 corresponding to the minimum 28-day compressive strength of cement mortar after curing, as specified by NIS 444-1 (2017) and COREN (2021). Cement mortar is applied in masonry construction to bond block units and fill joints, in plastering and rendering to produce smooth and protective wall surfaces, in floor screeding for level base formation, and in general repair work. The quality of all these applications is governed primarily by one critical mechanical property: compressive strength.
Compressive strength is defined as the maximum compressive stress that a material can withstand before failure occurs under an axially applied load (BS EN 12390-3, 2019). For cement mortar, compressive strength is influenced by the water-cement ratio, the cement-sand proportioning, the grading and cleanliness of the fine aggregate, the degree of compaction during application, and the curing conditions and duration.
Summary of Chapters
1. Introduction: This chapter introduces the context of mortar quality in Nigeria, stating the problem of building failures and outlining the research aim, objectives, and hypotheses.
2. Literature Review: This section reviews conceptual, theoretical, and empirical literature regarding cement mortar performance, hydration processes, and standardisation frameworks in Nigeria.
3. Materials and Methods: This chapter describes the experimental design, including material selection, specimen preparation, laboratory testing procedures for compressive strength, and data analysis methods.
4. Results and Discussion: This chapter presents the laboratory findings, analyses the effects of mix ratio and curing age on strength, and assesses compliance with international standards.
5. Conclusions, Recommendations, and Contributions to Knowledge: This concluding chapter synthesises the research findings, provides practical recommendations for stakeholders, and highlights the study’s contributions to the field of construction technology.
Keywords
Cement mortar, Compressive strength, Nigerian construction, Mix proportions, Portland Limestone Cement, Curing age, Masonry, Building quality, Structural integrity, Laboratory testing, Construction standards, Material characterisation, Aggregate quality, Building failure, Quality assurance.
Frequently Asked Questions
What is the core focus of this research?
This research focuses on evaluating the compressive strength performance of cement mortar commonly used in Nigerian building applications to bridge the gap between site practices and international engineering standards.
What are the primary themes examined in the study?
The study investigates the impact of cement-sand mix ratios, the influence of curing periods, the quality of locally sourced materials, and their collective effect on the structural integrity of masonry walls.
What is the main objective of the study?
The primary objective is to determine suitable mortar mix proportions for the Nigerian construction environment that meet established strength requirements, thereby providing evidence-based benchmarks for improved building quality.
Which scientific methodology was employed?
The study used a quantitative experimental laboratory design, preparing and testing mortar prism specimens at various mix ratios and curing ages, strictly adhering to British Standards (BS EN) and Nigerian Industrial Standards (NIS).
What does the main body of the work cover?
The main body details the material properties, hydration theory, historical development of mortar standards, the experimental programme, and a comprehensive analysis of test results compared against ASTM and other global performance benchmarks.
Which keywords define this work?
The work is characterised by keywords such as cement mortar, compressive strength, mix proportions, building failure, quality assurance, and Nigerian construction standards.
Why is the 1:3 mix ratio highlighted?
The study identifies the 1:3 mix ratio as the minimum appropriate standard for structural masonry, as it is the only tested mix that consistently satisfies the ASTM Type S strength requirements.
How does the study relate to Nigerian building failures?
The research provides quantitative evidence that the common, substandard site practice of using lean mixes like 1:6 for load-bearing applications is a significant risk factor, directly contributing to the structural deficiencies observed in many building collapses.
- Quote paper
- Peter Ellah (Author), 2026, Performance Evaluation of Compressive Strength of Cement Mortar for Building Application in Nigeria, Munich, GRIN Verlag, https://www.grin.com/document/1730793
