The effects of different cement dosages, slumps, and pumice aggregate ratios on the thermal conductivity and density of concrete

Uysal, Habib; Demirboğa, Ramazan; Şahin, Remzi; Gül, Rüstem

doi:10.1016/j.cemconres.2003.09.018

Cited by 198 publications

(73 citation statements)

References 9 publications

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“…They found that the thermal conductivity was up to 46% lower than that of similar plain cement paste samples. This can be attributed to the fact that the pumice (a highly porous volcanic rock) has a lower thermal conductivity than cement paste [35]. It has also been reported that the effective thermal conductivity of cement mortar increased with increasing free moisture content φ w [28,29,34,36].…”

Section: Thermal Conductivity Of Cementitious Compositesmentioning

confidence: 91%

“…This can also be attributed to the difference in thermal conductivity between air and water filling up the pores [34]. Moreover, the type and volume fraction of aggregates present in cement mortar composites can alter their effective thermal conductivity [26,34,35]. Table 2.2 summarizes the experimental studies reporting the thermal conductivity of cement mortar with different types and amount of aggregate inclusions as well as w/c ratio, age, and free moisture content φ w [26,29,34].…”

Section: Thermal Conductivity Of Cementitious Compositesmentioning

confidence: 99%

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Thermal conductivity of cementitious composites containing microencapsulated phase change materials

Ricklefs

Thiele

Falzone³

et al. 2017

International Journal of Heat and Mass Transfer

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This thesis investigates the effects of adding microencapsulated phase change materials (PCM) on the thermal conductivity of cement paste and cement mortar composites. Embedding cementitious composites with microencapsulated PCM has been considered a promising method for increasing the thermal mass of buildings to achieve greater energy efficiency. Cement paste and cement mortar samples were synthesized with a constant water to cement ratio of 0.45. Both contained microencapsulated PCM with diameter ranging from 17-20 µm, volume fraction up to 30%, and a melting temperature around 24˚C. The cement mortar also contained quartz grains 150-600 µm in diameter such that the sum of the volume fractions of quartz and microencapsulated PCM was fixed at 55%.All samples were aged for more than 28 days. Their effective density and free moisture content were systematically measured. A guarded hot plate apparatus was designed, assembled, and validated according to the ASTM C177 to measure the effective thermal conductivity of the aged specimens of cement paste and cement mortar without and with microencapsulated PCM. Measurements were 2 performed between 10 and 40˚C, encompassing the entire PCM phase change temperature window. The effective thermal conductivity of both the cement paste and the cement mortar composites was found to be nearly independent of temperature in the range considered. It also decreased as the volume fraction of microencapsulated PCM increased. Finally, excellent agreement was obtained between experimental data and the effective medium approximation derived by Felske (2004) for core-shell-matrix composites. 3The thesis of Alex Ricklefs is approved.

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Section: Thermal Conductivity Of Cementitious Compositesmentioning

confidence: 91%

Section: Thermal Conductivity Of Cementitious Compositesmentioning

confidence: 99%

Thermal conductivity of cementitious composites containing microencapsulated phase change materials

Ricklefs

Thiele

Falzone³

et al. 2017

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

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“…Therefore, this factor reflects the test results of thermal conductivity coefficient of clay brick wall systems. In an investigation by Uysal et al [24], it was found that the density of concrete decreased with an increase in pumice aggregate ratios (at a constant slump and cement content) and the reduction in the density because of pumice aggregate replacement was 12 %, 22 %, 34 %, and 42 % for 25 %, 50 %, 75 %, and 100 %, respectively. As a result of the reduction in density, the effect of pumice aggregate that replaced normal aggregates at 25 %, 50 %, 75 %, and 100 % by volume on thermal conductivity was about 8 %, 20 %, 28 %, and 47 %, respectively.…”

Section: Fig 11mentioning

confidence: 99%

Experimental Study on Engineering and Thermal Properties of Mortar and Plaster Produced With Pumice Aggregate

Eren

Marar

İlter

et al. 2015

Journal of Testing and Evaluation

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Now, it is widely accepted by civil engineers and architects that walls and masonry building units, which are made of pumice, can insulate buildings against both heat and sound, and also reduce the dead load of the building compared to traditional buildings. In this study, pumice was used as a fine aggregate in mortar and plaster instead of traditional crushed limestone sand. This study shows that the properties of pumice mortars indicate lower values compared to limestone mortars for workability durations, time of settings, and fresh and hardened unit weights. Other properties of pumice mortars indicate higher values compared to limestone mortars, such as water absorption, coefficient of capillary water absorption, drying shrinkage, flexural strength, and compressive strength. Also, wall systems made with pumice mortar and plaster show significant benefits in terms of thermal conductivity.

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“…LWAC has been known offers various advantages due to its lower density [1], higher ratio of strength/weight [2], less conductivity thermal [3,4], better durability properties [5,6], fire resistance [7] and etc. The use of lightweight concrete reduce the size of columns, beams, wall and foundation which as well reducing the dead load and minimizing the damages of structures due to earthquake [8].…”

Section: Introductionmentioning

confidence: 99%

The effect of polymer coated pumice to the stiffness and flexural strength of reinforce concrete beam

2017

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Abstract. Pumice has been proven as substitution material aggregate in lightweight aggregate concrete (LWAC). However due to its characteristic, pumice has the disadvantages of its excessive water absorption during preparation of concrete mixture which may reduce concrete strength. Therefore in order to eliminate this additional water absorption, this study investigate the effect of coated pumice in concrete mixture to the beam flexural strength and stiffness. This study performed flexural strength test on three types of sample: 1) normal reinforce concrete beam, 2) reinforce concrete beam with uncoated pumice and 3) reinforce concrete beam with coated pumice. The result showed that the lightest weight concrete occurred on the coated pumice specimen, with the reduction of water absorption was 4% compared to the uncoated pumice specimen. The stiffness of the reinforce beam with coated pumice was lower compared to the uncoated ones, this was due to the reduction of adhesion action between cement and aggregates. However, the use of coated pumice increased the flexural strength compare to the uncoated ones with 2.58%.

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The effects of different cement dosages, slumps, and pumice aggregate ratios on the thermal conductivity and density of concrete

Cited by 198 publications

References 9 publications

Thermal conductivity of cementitious composites containing microencapsulated phase change materials

Thermal conductivity of cementitious composites containing microencapsulated phase change materials

Experimental Study on Engineering and Thermal Properties of Mortar and Plaster Produced With Pumice Aggregate

The effect of polymer coated pumice to the stiffness and flexural strength of reinforce concrete beam

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