Appropriate drying shrinkage prediction models for lightweight concrete containing coarse agro-waste aggregate

Maghfouri, Mehdi; Shafigh, Payam; Alimohammadi, Vahid; Doroudi, Yashar; Aslam, Muhammad Shahzad

doi:10.1016/j.jobe.2019.101148

Cited by 17 publications

(9 citation statements)

References 11 publications

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“…Some added admixture or additive such as water entraining agent [ 2 ], slag [ 3 ], fly ash [ 4 , 5 ], biomass ashes [ 6 ], waterproof material [ 7 ], and also the type of binder used, such as ordinary Portland cement (OPC), Portland composite cement (PCC) and Portland pozzolan cement (PPC), have effects on the shrinkage of the concrete as well. Additionally, fly ash usage in the conrete usually reduces the drying shrinkage both in normal concrete and in self-compacting concrete [ 8 , 9 , 10 ]. On the other hand, water-resistant materials are commonly used to cover concrete surface to reduce the number of capillaries present inside concrete in order to reduce the water-cement ratio [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Drying Shrinkage of Concrete Containing Calcium Stearate, (Ca(C18H35O2)2), with Ordinary Portland Cement (OPC) as a Binder: Experimental and Modelling Studies

et al. 2020

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This work investigates the effect of calcium stearate (Ca(C18H35O2)2) on concrete shrinkage behaviors by using experimental testing. The test specimens are cubes with each dimension given as 100 × 100 × 285 mm for shrinkage tests and cylinders with 150 mm diameter and 300 mm height for compressive strength tests. The calcium stearate with fractions of 0, 0.1, 0.2, and 0.3% from the weight of cement are used in the tests. The results showed that the shrinkage occurred in amounts of 0.079, 0.062, 0.065, and 0.060 mm for the specimens containing calcium stearate of 0, 0.1, 0.2, and 0.3%, respectively. Moreover, we also perform shrinkage modelling to explore a possibility to incorporate the calcium stearate fraction into the standard concrete shrinkage model. There are three well-known shrinkage models used here, i.e., the Sakata, the Japan Standard and the Bazant-Baweja models, where only the latter one is capable to capture our experimental results very well for different fractions of calcium stearate.

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Section: Introductionmentioning

confidence: 99%

Drying Shrinkage of Concrete Containing Calcium Stearate, (Ca(C18H35O2)2), with Ordinary Portland Cement (OPC) as a Binder: Experimental and Modelling Studies

et al. 2020

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“…The main reason for this phenomenon may be the continuous progress of cement hydration, which had a compaction effect on GHBs [ 39 ]; the volume deformation of GHBs occurred to a certain extent, which could increase the total shrinkage strain of RATIC at early stage. Maghfouri et al [ 22 ] reached similar conclusions by adding oil palm shells to concrete. As also shown in Figure 9 a, GHBs had little effect on the long-term development of total shrinkage strain of TIC, which may be due to the fact that the water adsorbed on the surface of GHBs and the water in the open pores dissipated quickly.…”

Section: Resultsmentioning

confidence: 67%

“…At present, it is not common to conduct long-term shrinkage test as a routine test for every single concrete mixture, the structural engineer can only assess the risk of concrete cracking using existing prediction models [ 22 ]. In order to better represent the shrinkage of concrete in precast components, a large number of autogenous shrinkage, drying shrinkage and total shrinkage models have been established [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

“…In order to better represent the shrinkage of concrete in precast components, a large number of autogenous shrinkage, drying shrinkage and total shrinkage models have been established [ 23 ]. Maghfouri et al [ 22 ] used five existing concrete shrinkage models to compare the shrinkage strain behavior of light weight concrete containing coarse aggregate and found that the EC2 model was the best prediction model to simulate the early shrinkage of light weight aggregate concrete. Bunderen et al [ 24 ] compared the error between the total shrinkage model and the drying shrinkage model of concrete, and found that EC2 model could also be used to predict the drying shrinkage of concrete.…”

Section: Introductionmentioning

confidence: 99%

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Time-Dependent Shrinkage Model for Recycled Fine Aggregate Thermal Insulation Concrete

et al. 2021

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In this study, the shrinkage performance of recycled aggregate thermal insulation concrete (RATIC) with added glazed hollow beads (GHB) was investigated and a time-dependent shrinkage model was proposed. Two types of recycled fine aggregate (RFA) were used to replace natural fine aggregate in RATIC: RFA from waste concrete (RFA1) and waste clay brick (RFA2). Besides, the mechanical properties and thermal insulation performance of RATIC were also studied. Results showed that the pozzolanic reaction caused by RFA2 effectively improved the mechanical properties of RATIC; 75% was the optimal replacement ratio of RATIC prepared by RFA2. Added RFA decreased the thermal conductivity of thermal insulation concrete (TIC). The total shrinkage strain of RATIC increased with the increase of the replacement ratio of RFA. The 150d total shrinkage of RATIC prepared by RFA1 was 1.46 times that of TIC and the 150d total shrinkage of RATIC prepared by RFA2 was 1.23 times. The addition of GHBs led to the increase of early total shrinkage strain of concrete. Under the combined action of the higher elastic modulus of RFA2 and the pozzolanic components contained in RFA2, the total shrinkage strain of RATIC prepared by RFA2 with the same replacement ratio was smaller than that of RATIC prepared by RFA1. For example, the final total shrinkage strain of RATIC prepared by RFA2 at 100% replacement ratio was about 18.6% less than that of RATIC prepared by RFA1. A time-dependent shrinkage model considering the influence of the elastic modulus of RFA and the addition of GHB on the total shrinkage of RATIC was proposed and validated by the experimental results.

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“…4,5 Various methods of curing includes immersion in water, 6 sprinkling, 7 wet coverings, 8 plastic sheet covering, 9 open air curing, 10 and curing with use of chemical admixtures 11 or internal curing with use of natural fibers. 12,13 Many researchers have studied the effect of curing conditions on the strength development and shrinkage of ordinary concrete, 14 high-performance concrete, [15][16][17] lightweight concrete, 18 self-compacting concrete, 19,20 concrete containing supplementary cementitious materials as silica fume, 21,22 fly ash, 23 geopolymers, 24,25 clay, fly ash-clay, or shale ceramsite. 26 The actual concrete curing starts in the moment of compaction -maintaining ambient relative humidity over 90% limits shrinkage deformations to a large extent.…”

Section: Introductionmentioning

confidence: 99%

Influence of compressive strength and maturity conditions on shrinkage of ordinary concrete

Szlachetka

Witkowska-Dobrev

Dohojda

et al. 2021

Advances in Mechanical Engineering

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The paper presents results of investigations of compressive strength and shrinkage of concrete samples made on the basis of the Portland cement CEM I 32.5R, after 2, 7, 14, 28, 90, and 365 days of maturation in four different maturation conditions. It was shown that after 28 days the samples cured according to the standard in the cuvettes with water achieved the highest compressive strength, although the early-age compressive strengths after 7 and 14 days were lower than those for the samples cured in building film and in dry conditions. A determined correlation between the compressive strength and shrinkage of the concrete proves that wet curing also allows a total elimination of the shrinkage in the first 28 days. Along with the growth of the compressive strength, the drying shrinkage reduces. Obtained results confirmed that the best way of concrete curing, among the analyzed methods, from the point of view of both compressive strength and volume changes is the wet curing.

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Appropriate drying shrinkage prediction models for lightweight concrete containing coarse agro-waste aggregate

Cited by 17 publications

References 11 publications

Drying Shrinkage of Concrete Containing Calcium Stearate, (Ca(C18H35O2)2), with Ordinary Portland Cement (OPC) as a Binder: Experimental and Modelling Studies

Drying Shrinkage of Concrete Containing Calcium Stearate, (Ca(C18H35O2)2), with Ordinary Portland Cement (OPC) as a Binder: Experimental and Modelling Studies

Time-Dependent Shrinkage Model for Recycled Fine Aggregate Thermal Insulation Concrete

Influence of compressive strength and maturity conditions on shrinkage of ordinary concrete

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