scholarly journals EFFECTS OF VARYING WATER-CEMENT RATIOS ON DIFFERENT GRADES OF CONCRETE USING LOCALLY MATERIALS

2021 ◽  
Vol 19 (1) ◽  
pp. 92-100
Author(s):  
H. O. UGORJI ◽  
M. E. EPHRAIM ◽  
A. ADETILOYE
Keyword(s):  
Compressive Strength ◽  
Laboratory Tests ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Compressive Strength Of Concrete ◽  
Quarry Dust ◽  
Mixed Concrete

This research focused on laboratory tests that was conducted using locally available 10mm washed all-in gravel, quarry dust with varying water cement ratio. The research was carried-out using 108 (150 x 150 x 150) mm standard cubes that were all tested from three designed concrete mixes. In the present study, the role of water-cement ratio in compressive strength of concrete was investigated. The mixed concrete samples with water-cement ratios of 0.3, 0.35 and 0.40 were experimented for 3, 7, 21 and 28 days of curing. The results of compressive strength experiment showed that due to increase in water-cement ratio from 0.3 to 0.40, the compressive strength improved from 22 N/mm2 to 24.33 N/mm2 for 1:1.5:3 design mix, the compressive strength improved from 22.88 N/mm2 to 24 N/mm2 for 1:2:1 design mix, while compressive strength improved from 24 N/mm2 to 25.3 N/mm2 for 1:1:2 design mix   respectively. The results for compressive strength experiments showed that the 0.4 water-cement ratio resulted in the optimum compressive strength for all three design mixes.      

scholarly journals Effect of Water Cement Ratios on Compressive Strength of Palm Kernel Shell Concrete

2019 ◽  
Vol 2 (Issue 1) ◽  
Author(s):  
A.O Adeyemi ◽  
M.A Anifowose ◽  
I.O Amototo ◽  
S.A Adebara ◽  
M.Y Olawuyi
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
Fresh Concrete ◽  
Palm Kernel ◽  
Hardened Concrete ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Palm Kernel Shell ◽  
Compressive Strength Of Concrete ◽  
Palm Kernel Shells

This study examined the effect of varying water cement ratio on the compressive strength of concrete produced using palm kernel shell (PKS) as coarse aggregate at different replacement levels. The replacement levels of coarse aggregate with palm kernel shells (PKS) were 0%, 25%, 50%, and 100% respectively. PKS concrete cubes (144 specimens) of sizes 150mm x 150mm x 150mm were cast and cured in water for 7, 14, 21 and 28 days respectively. A mix ratio of 1:2:4 was adopted with water-cement ratio of 0.45, 0.5, and 0.6 respectively while the batching was done by weight. Slump test was conducted on fresh concrete while compressive strength test was carried out on the hardened concrete cubes using a compression testing machine of 2000kN capacity. The result of tests on fresh concrete shows that the slump height of 0.45 water cement ratio (w/c) increases with an increase in PKS%. This trend was similar to 0.50 and 0.60 w/c. However, the compressive strength of concrete cube decreases with an increase in w/c (from 0.45 to 0.60) but increases with respect to curing age and also decreases with increase in PKS%. Concrete with 0.45 water-cement ratio possess the highest compressive strength. It was observed that PKS is not a good substitute for coarse aggregate in mix ratio 1:2:4 for concrete productions. Hence, the study suggest the use of chemical admixture such as superplasticizer or calcium chloride in order to improve the strength of palm kernel shells-concrete.

Research of Performance of Low Amount of Cement Manufactured-Sand Concrete

2013 ◽  
Vol 357-360 ◽  
pp. 1200-1205
Author(s):  
Chun Hui Yu ◽  
Gu Hua Li ◽  
Jin Liang Gao ◽  
Qun Wei ◽  
Da Zhen Xu
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Grain Shape ◽  
Great Influence ◽  
Cementitious Materials ◽  
Natural Sand ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Manufactured Sand

Compared with natural sand, manufactured-sand is of small porosity, poor grain shape and graded, which impacts mixes workability and the properties after hardening. In Concrete, playing the role of retaining moisture water is mainly powder, including cement, powder in the sand and fly ash etc. The amount of powder has a great influence on the properties of concrete, especially on its workability. This paper mainly discusses the influence of amount of cement, cementitious materials, fly ash, water-cement ratio and other factors on the workability, compressive strength and shrinkage of concrete. The experiments show that, in the case of the low amount of cement, workability of the manufactured-sand concrete mixture, compressive strength and shrinkage deformation of test block all meet the actual requirements.

scholarly journals Effects of Disparate Zones of Sand on the Compressive Strength of Concrete

2021 ◽  
Vol 9 (11) ◽  
pp. 1368-1375
Author(s):  
Suhaib Bakshi
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
Testing Machine ◽  
Concrete Compressive Strength ◽  
Research Papers ◽  
Concrete Material ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Concrete Mix ◽  
Compressive Strength Of Concrete

Abstract: Compressive strength of concrete is the capacity of concrete to bear loads of materials or structure sans breaking or being deformed. Specimen under compression shrinks in size whilst under tension the size elongates. Compressive strength essentially gives concept about the properties of concrete. Compressive strength relies on many aspects such as water-cement ratio, strength of cement, calidad of concrete material. Specimens are tested by compression testing machine after the span of 7 or 28 days of curing. Compressive strength of the concrete is designated by the load on the area of specimen. In this research various proportions of such aggregate mixed in preparing M 30 grade and M 40 grade of Concrete mix and the effect is studied on its compressive strength . Several research papers have been assessed to analyze the compressive strength of concrete and the effect of different zones of sand on compressive strength are discussed in this paper. Keywords: Sand, Gradation, Coarse aggregate, Compressive strength

scholarly journals Comparative Analysis of Engineering Properties of Indus River Sand Concrete with Quarry Dust Concrete, District Jamshoro Sindh Pakistan

2021 ◽  
pp. 11-16
Author(s):  
Mushtaque Ahmed Pathan ◽  
Maryam Maira ◽  
Arif Ali Khaskheli ◽  
Agha Jamshed Ahmed
Keyword(s):  
Compressive Strength ◽  
Comparative Analysis ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Engineering Properties ◽  
River Sand ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Structural Applications ◽  
Quarry Dust

This study shows the comparative analysis engineering, the physical and mechanical properties of river sand concrete with quarry dust concrete. The selected materials were batched by weight and volume. The water-cement ratio opted as 0.50 1:2:4 for mix ratio was selected for the experimental investigation respectively. The specimens were cured for 7, 14, 21, and 28 days. For the purpose Slump, density, and compressive strength tests were carried out. The river sand concrete showed better results and greater density and compressive strength than quarry dust concrete for all curing ages. The 28 days of curing, river sand concrete rise the required compressive strength by 36%, whereas quarry dust concrete was less than the limit compressive strength by 12%. Both river sand concrete and quarry dust concrete for the selected water/cement ratio and mix ratio has been found suitable for non-structural applications and lightly-loaded members where high strength is not a prerequisite. Keywords: River Sand; Quarry Dust; Density; Compressive Strength; Concrete

scholarly journals Correlations between water absorption, electrical resistivity and compressive strength of concrete with different contents of pozzolan

2019 ◽  
Vol 9 (2) ◽  
pp. 152-166 ◽  
Author(s):  
Ronaldo Alves de Medeiros-Junior ◽  
Guilherme da Silva Munhoz ◽  
Marcelo Henrique Farias de Medeiros
Keyword(s):  
Compressive Strength ◽  
Electrical Resistivity ◽  
Water Absorption ◽  
Lower Content ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Strength Concrete ◽  
Concrete Mixtures ◽  
Concrete Properties ◽  
Compressive Strength Of Concrete

This research confronts the following concrete properties: water absorptions (by immersion and capillarity), electrical resistivity and compressive strength. Concrete mixtures with two types of cement were tested. Results showed that concretes with higher content of pozzolan had higher resistivity and greater absorption by capillarity, for water/cement ratios lower than 0,60. This behavior is attributed to reduced pore diameters and microstructure densification. However, for water/cement ratio of 0,60, concrete with lower content of pozzolan presented higher absorption by capillarity. It was observed that the compressive strength and the electrical resistivity behaved inversely proportional to the water/cement ratio, and the absorption by immersion and capillarity are directly proportional to the water/cement ratio. Correlations with high determination coefficients were found between tests.

Coefficient of Linear Expansion of Air-Entraining Concrete with Silica Fume

2010 ◽  
Vol 168-170 ◽  
pp. 2116-2120
Author(s):  
Jian Chao Dou ◽  
Jian Sen Yang
Keyword(s):  
Compressive Strength ◽  
Silica Fume ◽  
Linear Expansion ◽  
Content Increase ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Air Content ◽  
Effect Of Water ◽  
Compressive Strength Of Concrete ◽  
Coefficient Of Linear Expansion

The effect of water-cement ratio, air content, silica fume and sand ratio of concrete on the coefficient of linear expansion(CLE) was studied by orthogonal experiment. The results show that under a certain amount of cement material, CLE of concrete increase as the water-cement ratio increases and the effect of water-cement ratio on CLE of concrete is remarkable; with the increase of blending ratio of silica fume, the CLE of concrete increases; the CLE of concrete reduces with 3.5% air content in concrete, but rebound with 6% air content in concrete; with the sand rate increases, CLE of concrete increases; CLE per unit compressive strength of concrete with silica fume decreases with increase of silica fume content; CLE per unit compressive strength of concrete with air content increase when air content increase.

The Effect of Eggshells Ash on the Compressive Strength of Concrete

2017 ◽  
Vol 728 ◽  
pp. 402-407 ◽  
Author(s):  
Fazeera Ujin ◽  
Kamran Shavarebi Ali ◽  
Zarina Yasmin Hanur Harith
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Compression Test ◽  
Conventional Concrete ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Cement Replacement ◽  
Concrete Mix ◽  
Compressive Strength Of Concrete ◽  
Landfill Disposal

This paper presents the main results of the research carried out to analyse the mechanical properties of concrete incorporating with eggshells waste. The use of eggshells ash in concrete formulations was investigated as an alternative to landfill disposal. The objective of this study is to find the suitability of eggshells ash as cement replacement in concrete. The cement has been replaced by waste eggshells ash accordingly in the range of1% and 2.5%. The eggshell ash passing the 90μm sieve was used in the investigation. By using 1% and 2.5% amount of the waste eggshells ash, water cement ratio were designed which is 0.47, 0.55 and 0.70 and compared in terms of slump and strength with the conventional concrete. The concrete specimens were tested in the series of compression test to determine the strength of concrete for 3, 7 and 28 days. As a result, the additional of eggshells ash to the concrete mix increase the strength of the concrete. In short, the higher percentage of eggshells ash in the mix means a higher compressive strength for the concrete. Hence, it is suggested that eggshells ash can be used as partially cement replacement in concrete.

scholarly journals COMPORTAMENTO DO CONCRETO MEDIANTE A ADIÇÃO DE POZOLANA ARTIFICIAL

e-xacta ◽  
2013 ◽  
Vol 6 (1) ◽  
pp. 55
Author(s):  
Nathália Maria Assi Rabelo ◽  
Christianne Rodrigues Garcia
Keyword(s):  
Air Pollution ◽  
Compressive Strength ◽  
High Performance ◽  
Laboratory Tests ◽  
High Performance Concrete ◽  
Cement Ratio ◽  
Compressive Strength Of Concrete ◽  
Reduce Energy Consumption ◽  
Para Determinar ◽  
Mineral Waste

<p align="justify">A utilização de resíduos minerais vem sendo empregada na indústria do concreto, trazendo vantagens em âmbitos técnicos, econômicos e ambientais. Ao substituir o cimento por esses resíduos, há a redução do consumo de energia e poluição do ar, gerados por sua produção e, ainda, contribui na busca por concretos de alto desempenho. Nesse contexto, o presente trabalho teve como objetivo adicionar pozolana artificial ao concreto e determinar a resistência à compressão, assim como a sua trabalhabilidade, além de estabelecer um comparativo entre o concreto adicionado de pozolana artificial e o concreto sem adição, contendo somente o cimento Portland. Através de ensaios laboratoriais, observou-se que a pozolana, devido a características específicas, não apresentou resultados favoráveis. Em sua adição ao concreto, observou-se que a quantidade de água necessária para a realização dos ensaios foi maior, alterando assim a relação água/cimento, sendo consequentemente necessário um aumento da quantidade de cimento. Observou-se, também, que houve uma queda na resistência à compressão do concreto, devido à presença da pozolana. Verificou-se que o material estudado necessita de modificações em suas propriedades para a sua utilização como insumo do concreto, portanto novas pesquisas, com um maior número de ensaios, foram sugeridas para determinar a sua viabilidade.</p><p align="justify">Abstract</p><p align="justify">Mineral waste has been used in the concrete industry, bringing advantages in technical fields, economic and environmental. By replacing the cement by these residues eventually reduce energy consumption and air pollution generated by their production and also help in the search for high performance concrete. In this context, the present study aimed to add artificial pozzolan to concrete and to determine the compressive strength, as well as its workability, and establish a comparison between the concrete and artificial pozzolan added without adding concrete containing only Portland cement. Through laboratory tests, it was observed that the pozzolan, due to specific features, showed no favorable results. In its addition in concrete, it was observed that the amount of water required for the tests was greater, thus altering the water / cement ratio, and is therefore required an increased amount of cement. It was also observed that there was a decrease in the compressive strength of concrete due to the presence of pozzolan. It was found that the studied material requires changes in its properties for use as an input of the concrete, thus further research, with a greater number of tests have been suggested to determine their viability.</p>

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