Shrinkage, cementitious paste volume, and wet packing density of concrete

Lai, M.H.; Binhowimal, S.A.M.; Griffith, A. M.; Hanžič, L.; Chen, Zhouyi; Wang, Qing; Ho, J.C.M.

doi:10.1002/suco.202000407

Cited by 69 publications

(15 citation statements)

References 78 publications

(119 reference statements)

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“…erefore, when shrinkage is a concern, the utilization of RHA and WSA can be a part of the strategy to mitigate its effect. According to Lai et al [78], shrinkage decreases as the amount of cement replacement material (such as ash) increases. e reduction in shrinkage is due to the concrete's wet packing density.…”

Section: Drying Shrinkagementioning

confidence: 99%

Mechanical Properties of Concrete Incorporating Rice Husk Ash and Wheat Straw Ash as Ternary Cementitious Material

Bheel

Awoyera

Shar

et al. 2021

Advances in Civil Engineering

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Over the last decade, there has been a surge in research into possible cement substitute materials in concrete that are environmentally friendly, cost-effective, and socially beneficial. The alternatives include industrial and agricultural wastes, and their potential advantages can be achieved through recycling, repurposing, and renewing processes. With the use of these wastes as additional and replacement materials, significant energy savings and a reduction in cement use can be achieved, which helps to reduce carbon dioxide (CO2) emissions in the environment. Therefore, the use of rice husk ash (RHA) and wheat straw ash (WSA) as ternary cementitious material (TCM) in concrete can help reduce the impact on the environment and minimize the use of Portland cement (PC) in the concrete mixture. This research work is performed on the concrete blended with 0%, 5%, 10%, 15%, and 20% of RHA and WSA as TCM in the mixture. However, the purpose of this experimental work is to investigate the influence of RHA and WSA as TCM on the fresh (slump), physical (water absorption and density), and hardened properties (compressive strength, splitting tensile strength, and flexural strength) and drying shrinkage of concrete. In this regard, a total of 240 concrete samples (cylinders, cubes, and beams) were prepared with 1 : 2 : 4 mix proportions at 0.50 water-cement ratio and cured at 7 and 28 days, respectively. Moreover, the workability of green concrete is getting reduced as the quantity of TCM increases in the mixture. Besides, the compressive strength, splitting tensile strength, and flexural strength are enhanced by 12.65%, 9.40%, and 9.46% at 10% of TCM (5% RHA and 5% WSA) on 28 days consistently. Furthermore, the density and water absorption of concrete are reduced with the increase in the dosages of TCM on 28 days, respectively. In addition, the drying shrinkage is reduced with the increase in the quantity of TCM in concrete.

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Section: Drying Shrinkagementioning

confidence: 99%

Mechanical Properties of Concrete Incorporating Rice Husk Ash and Wheat Straw Ash as Ternary Cementitious Material

Bheel

Awoyera

Shar

et al. 2021

Advances in Civil Engineering

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“…It is important to note that including slag and FA in the DMDA concretes facilitates cement hydration and the reaction with Ca(OH) 2 in the system, which increases calcium‐silicate‐hydrate (C‐S‐H) gel volume and cement paste density. These hydration products contribute significantly to strength and shrinkage resistance in concrete 47,48 . Furthermore, Figure 10 also shows that DS in H6000 was higher than in S6000.…”

Section: Resultsmentioning

confidence: 92%

“…These hydration products contribute significantly to strength and shrinkage resistance in concrete. 47,48 Furthermore, Figure 10 also shows that DS in H6000 was higher than in S6000. This may be explained by the higher relative paste content in the H6000 mixture (see Table 3) and echoes the findings of Rozière et al 49 and Yang et al 50 The aggregate and water content in concrete mixtures are likely the two most important factors of influence on DS performance.…”

Section: Drying Shrinkagementioning

confidence: 89%

Densified mixture design algorithm: A novel mix design concept and its application for green concretes incorporating industrial by‐products

Nguyen

Limongan

Nguyen

et al. 2023

Env Prog and Sustain Energy

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Despite the fact that densified mixture design algorithm (DMDA) has been identified as a promising tool for green concrete mix design, its use in real practice has still been minimal worldwide. Due to the lack of precise information on DMDA computation in earlier studies, this work proposes DMDA including fly ash and ground granulated blast-furnace slag as a viable way to improve the long-term performance of green concrete. To encourage the use of DMDA, this study offers a detailed description of the DMDA mix design, as well as a step-by-step standard operating procedure and an empirical example of the computation. Assessments of the long-term performance of green mixtures (self-consolidating concrete and high-performance concrete) and ordinary Portland cement concrete (designed using the conventional method of American Concrete Institute, ACI) were made. Performances of the ACI (O6000 mixture) and DMDA concretes (S6000 and H6000 mixtures) were then compared in terms of compressive strength, elastic modulus, shrinkage, and creep strain. As a result, all of the concrete samples attained the target strength of above 41 MPa (6000 psi) after only 28 days. Moreover, compressive strength, elastic modulus, shrinkage, and creep strain increased significantly in all of the concretes over curing time. Importantly, the experimental results confirmed that both types of DMDA concrete exhibited higher compressive strength and better long-term performance than the ACI concrete under elastic modulus, creep, and shrinkage aspects.

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“…6 Shrinkage is the phenomenon of reduction of volume or deformation of the concrete due to water loss of concrete. [7][8][9] Autogenous shrinkage is caused by water exiting the capillary pores to form cement hydration products 10 : this phenomenon generates a volume contraction of the cement paste even without loss of water to the external environment. This is a very important property in high-performance concretes due to the low waterto-cement ratio (w/c) and the high cement content.…”

Section: Introductionmentioning

confidence: 99%

Autogenous and drying shrinkage of structural concretes incorporating recycled concrete aggregates from different sources

Amario

Pepe

Rangel

et al. 2022

Structural Concrete

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The main relevant difference between recycled concrete aggregates (RCAs) in comparison with the companion natural ones, is the presence of the Attached Mortar content which confers to the RCAs higher porosity and, consequently, higher water absorption capacity. In the last decades, several studies have been performed worldwide for unveiling the role of the employed RCAs on the resulting concrete mixture performances at both fresh and hardened states. On the other hand, the effects of RCA on the early‐age and/or long‐term concrete deformations (e.g., shrinkage) are still very limited. In this context, this article summarizes the results of a wide experimental campaign aimed at evaluating the influence of RCAs on the autogenous and drying shrinkage of normal (35 MPa) and high (60 MPa) strength recycled aggregate concrete (RAC) mixtures. A total of 10 mixtures were realized by considering the variation of both the original source and size of employed RCAs. The results showed a clear correlation between the intrinsic properties (i.e., Attached Mortar content) of the employed RCAs and the resulting concrete deformation. Moreover, although the drying shrinkage is higher for RAC mixtures, the presence of a more porous aggregates mitigates the observed autogenous shrinkage. Consequently, the overall total shrinkage result to be almost unaffected by the presence of the recycled particles.

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Shrinkage, cementitious paste volume, and wet packing density of concrete

Cited by 69 publications

References 78 publications

Mechanical Properties of Concrete Incorporating Rice Husk Ash and Wheat Straw Ash as Ternary Cementitious Material

Mechanical Properties of Concrete Incorporating Rice Husk Ash and Wheat Straw Ash as Ternary Cementitious Material

Densified mixture design algorithm: A novel mix design concept and its application for green concretes incorporating industrial by‐products

Autogenous and drying shrinkage of structural concretes incorporating recycled concrete aggregates from different sources

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