Effect of Practical Curing Methods on the Properties of Roller Compacted Concrete

Ahmed, Hisham K.; Gata, Intesar Kadhim

doi:10.30684/etj.2015.101919

Cited by 5 publications

(4 citation statements)

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“…The results obtained from measurement of water absorption of RCC specimens using different compaction methods are shown in table (6). It can be seen that the percentage of the absorption for specimen compacted by pressure 10 MPa is greater than that of other compaction method this may be attributed to the presence of voids as a result of insufficiently compacted pressure to obtain fully compacted concrete [17] .while the lowest overall absorption is for the specimens compacted by (vibrator table with CBR hammer) and that by compacting pressure 20 MPa. Generally these results show that the compaction method has a little effect on the water absorption of RCC.…”

Section: Water Absorptionmentioning

confidence: 86%

“…The figures shows also that the compressive strength at 90 days age of specimen obtained using static compaction method by compacting pressure 10 MPa is lower than that compacted by 15 MPa and 20 MPa by 14.6 % and 31% respectively. This reduction may be due to the presence of voids as results of insufficiently compacted pressure to obtain fully compacted concrete, these voids are reflected in their reduction in compressive strength [17]. From the results in figures (1 and 2) it can be clearly seen that the compressive strength at early age and later age of specimen made by using vibrator table with modified Proctor test is approximately the same with compressive strength of specimen made by compacting pressure 20 MPa.…”

Section: Compressive Strengthmentioning

confidence: 87%

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Effect of Compaction Methods on the Properties of Roller Compacted Concrete

Ahmed¹,

Abdulrazzak²

2014

ETJ

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Roller compacted concrete (RCC) is a technology characterized mainly use of roller for compaction. This construction method permits considerable reduction in costs and construction time of dams and roads. The main aim of this work is to investigate the influence of compaction methods on the properties of RCC. the experimental program included preparing cylindrical specimens with (diameter of 150 mm by height of 300 mm) for measuring the compressive strength, splitting tensile strength and absorption. And it also includes prism specimens with (100*100*400) mm for measuring the modulus of rupture. These specimens were compacted by using different compaction methods, dynamicly (modified proctor hammer compaction (CBR test), vibrator table, and vibrator table with CBR test) and statically (compacting pressure (compacting pressure 10 MPa, 15 MPa and 20 MPa). Results show that the compaction methods have a noticeable effect on the properties of RCC. The results also indicated that using vibrator table with CBR show an increase in the compressive strength, splitting tensile strength and modulus of rupture by 23%, 14% and 13%, respectively as compared with compacted by vibrator table only. The results also show that using compacting pressure 20 MPa show an increase in the compressive strength, splitting tensile strength and modulus of rupture by 31%, 27%, and 39%, respectively as compared with that made by compacting pressure 10 MPa.

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Section: Water Absorptionmentioning

confidence: 86%

Section: Compressive Strengthmentioning

confidence: 87%

Effect of Compaction Methods on the Properties of Roller Compacted Concrete

Ahmed¹,

Abdulrazzak²

2014

ETJ

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“…The increase in compressive strength of HSC specimens containing MK may be due to the pozzolanic reaction between MK and Ca(OH) 2 that leads to the reduction in the concentration of the Ca(OH) 2 crystals in transition zone and results in improving the bond between the cement paste and the aggregate surface [18,19].…”

Section: Workabilitymentioning

confidence: 99%

Mechanical Properties of High Strength Concrete Containing Different Cementitious Materials

Ahmed¹,

Oday²

2016

ETJ

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High strength concrete has strength significantly beyond what is used in normal practice. According to American Concrete Institute (ACI), high strength concrete revised the definition to cover mixtures with specified design strength of 55 MPa or more. The main objective of this investigation is to study the effect of using different supplementary cementitious materials in binary blends on mechanical properties of high strength concrete.The experimental work includes three stages: firstly, preparation of cementitious materials (metakaolin and pumice) from local materials, second involves conducting several trial mixes to choose the best of superplasticizer that satisfies the required properties and to specify the optimum water content which is designed in laboratory by 0.3 W/Cm ratio, to achieve workability with (60-80mm) slump and the best compressive strength which was 64.6 at 28 days.Thirdly carrying out tests to find out the compressive strength, splitting tensile strength, modulus of rupture, on binary concretes including mixes containing silica fume as cement replacement at percentages of 8%, 10% and 15%, mixes containing metakaolin as cement replacement levels of 10%, 15%, and 20% and mixes containing pumice at cement replacement of 10%, 15%, and 20%.These properies were measured at ages ranging from7 days to 180 days.The results indicate that the silica fume performs better than other supplementary cementitious materials (metakaolin or pumice) in terms of the compressive strength, splitting tensile strength and modulus of rupture development at ages of 7,28,60,90and180 days where the average percentage of increase when using 8%,10% and 15% of silica fume was about (19%,23% and 18.7%) ,respectively, while when using 10%,15% and 20% metakaolin the average percentage of increase was (10%,12.6% and 4%) respectively, also when using 10%,15% and 20% of pumice the average percentage of increase was (2.6%, 6% and 1.5%), respectively.

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“…Despite that, the results showed that different cement contents barely affected bulk density. Due to low water content, permanent water curing was utilized to obtain better hydration of RCCP mixtures [15][16][17]. Numesh et al [18] concluded that using more than 10% of SF as a cement replacement will decrease the compressive strength of concrete.…”

Section: Introductionmentioning

confidence: 99%