Optimizing mix proportion and properties of lightweight concrete incorporated phase change material paraffin/recycled concrete block composite

Suttaphakdee, Pattaraporn; Dulsang, Nattakan; Lorwanishpaisarn, Narubeth; Kasemsiri, Pornnapa; Posi, Patcharapol; Chindaprasirt, Prinya

doi:10.1016/j.conbuildmat.2016.10.037

Cited by 54 publications

(18 citation statements)

References 45 publications

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“…According to the technical specification for lightweight aggregate concrete (JGJ51-2002), the loose volume method is used for the design and calculation of the mix ratio for all-lightweight aggregate concrete. According to previous research [31][32][33], the mix proportion of alllightweight aggregate concrete was based on the proportion of the loose volume of coarse or fine aggregate. e quality coordination of stone-LAC and sand-LAC under each replacement rate are shown in Table 3.…”

Section: Test Methodmentioning

confidence: 99%

Mechanical Properties and Conversion Relations of Strength Indexes for Stone/Sand‐Lightweight Aggregate Concrete

Zhang

Deng

Yang

2018

Advances in Materials Science and Engineering

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This is a study of the basic mechanical properties of specified density shale aggregate concrete, which is based on different replacement rates in stone-lightweight aggregate concrete (stone-LAC) and sand-lightweight aggregate concrete (sand-LAC). They were prepared by replacing the ceramsite and pottery sand with stone and river sand, respectively. Many tests were performed regarding the basic mechanical property indexes, including tests of cube compressive strength, axial compressive strength, splitting tensile strength, flexural strength, elastic modulus and Poisson’s ratio. The failure modes of specified density shale aggregate concrete were obtained. The effects of replacement rates on the mechanical property indexes of specified density shale aggregate concrete were analyzed. Calculation models were implemented for elastic modulus, for the conversion relations between the axial compressive strength and the cube compressive strength, and for the relations between the tension-compression ratio and Poisson’s ratio. It was shown that when the replacement rate of stone or river sand increased from 0% to 100%, the cube compressive strength of stone-LAC and sand-LAC increased, respectively, by 55% and 25%, the axial compressive strength increased, respectively, by 91% and 72%, splitting tensile strength increased, respectively, by 99% and 44%, and the flexural strength increased, respectively, by 46% and 26%. Similarly, the elastic modulus of stone-LAC and sand-LAC increased, respectively, by 16% and 30%. However, Poisson’s ratio for stone-LAC decreased first and then increased, eventually increased by 11%; Poisson’s ratio for sand-LAC only reduced gradually, eventually reduced by 67%. After introducing the influence parameter for the replacement rate, the established calculation models become simple and practical, and the calculation accuracies are favorable.

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Section: Test Methodmentioning

confidence: 99%

Mechanical Properties and Conversion Relations of Strength Indexes for Stone/Sand‐Lightweight Aggregate Concrete

Zhang

Deng

Yang

2018

Advances in Materials Science and Engineering

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“…Following the orthogonal approach (Suttaphakdee et al, 2016), a total of 16 mix proportions of CPB were designed according to the L16(4 5 ) orthogonal array (Table 1). Slurry mass concentration, tailing-waste (waste means tailings and rocks) ratio and waste-cement ratio were designed as the independent variables, whereas slurry slump, uniaxial compressive strength (UCS) on day 3 (R3), 7 (R7) and 28 (R28) were taken as dependent variables.…”

Section: Experimental Schemementioning

confidence: 99%

Strength and fluidity of cemented paste backfill at Qijiaojing Iron Mine, Northwest China

Huang¹,

Gao²

2017

Proceedings of the 20th International Seminar on Paste and Thickened Tailings

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Open stope mining with sequent backfilling was the major method adopted at Qijiaojing Iron Mine, and mix proportions of backfill materials were performed to produce the industrially required cemented paste backfill (CPB). The materials mainly comprise unclassified extra-fine tailings, waste rocks and Portland cements, and the experiments of the mix proportions followed the L16 (4 5) orthogonal design. The results showed that contents of-20 and-37 μm extra-fine grains within tailings accounted for 54 and 69wt%, respectively. The range analysis of orthogonal experiments shows that mass concentration, tailing-waste ratio and wastecement ratio are the most to least sensitive factors to the slurry slump, 3-day and 7-day strengths. For 28-day strength, the sensitive variables are sequentially mass concentration, waste-cement ratio and tailing-waste ratio. Additionally, the optimal mix proportion for cement paste backfill is obtained with a mass concentration of 78wt%, a tailing-waste ratio of 0.7 and a waste-cement ratio of 25. The slump and 28-day strength of the optimal CPB are 25.2 cm and 1.29 MPa, respectively.

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“…Geopolymer concrete (GPC) is an emerging construction material that can effectively handle industrial waste and reduce cementitious material, but its performance is least studied in terms of thermal enhancement. The addition of PCM into GPC has dropped the air temperature by 1.9 °C as compared to the reference [36]. PCM capsules were integrated into GPC and characterized for thermal and structural properties.…”

Section: Introductionmentioning

confidence: 99%

Thermal and Structural Characterization of Geopolymer-Coated Polyurethane Foam—Phase Change Material Capsules/Geopolymer Concrete Composites

et al. 2019

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The thermal and structural performance of geopolymer-coated polyurethane foam–phase change material capsules/geopolymer concrete composites was investigated. Three groups of concrete composites were prepared. The first was pure geopolymer (GP, control sample), the second was a GP/polyurethane foam (F) concrete composite, and the third was GP-coated polyurethane foam-phase change material capsules (GP-F-PCM)/GP concrete composites. Three different percentages of foam and GP-F-PCM capsules (25%, 50%, and 75%) were used in the composites. Thermal and U-value tests were conducted for all composites to characterize their peak temperature damping and insulation performances. The addition of 75% foam has been noticed to increase the back-surface temperature by 5.9 °C compared to the control sample. This may be attributed to the degradation of foam into low molecular constituents in the presence of a strong alkali. However, a temperature drop of 12.5 °C was achieved by incorporating 75% of GP-F-PCM capsules. The addition of 50% foam as a sandwich layer between two halves of a geopolymer concrete cube is also investigated. It was found that inserting a foam layer reduced the back-surface temperature by 3.3 °C, which is still less than the reduction in the case of GP-F-PCM capsules. The compressive strength was tested to check the integrity of the prepared concrete. At 28 days of aging, the compressive strength dropped from 65.2 MPa to 9.9 MPa with the addition of 75% GP-F-PCM capsules, which is still acceptable for certain building elements (e.g., nonloadbearing exterior walls). Generally, the best results were for the GP-F-PCM composite capsules as a heat insulator.

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Optimizing mix proportion and properties of lightweight concrete incorporated phase change material paraffin/recycled concrete block composite

Cited by 54 publications

References 45 publications

Mechanical Properties and Conversion Relations of Strength Indexes for Stone/Sand‐Lightweight Aggregate Concrete

Mechanical Properties and Conversion Relations of Strength Indexes for Stone/Sand‐Lightweight Aggregate Concrete

Strength and fluidity of cemented paste backfill at Qijiaojing Iron Mine, Northwest China

Thermal and Structural Characterization of Geopolymer-Coated Polyurethane Foam—Phase Change Material Capsules/Geopolymer Concrete Composites

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