Experimental Research on Interfacial Bonding Strength between Vertical Cast-In-Situ Joint and Precast Concrete Walls

Li, Changyong; Yang, Yabin; Su, Jiuzhou; Meng, Huidi; Pan, Liyun; Zhao, Shunbo

doi:10.3390/cryst11050494

Cited by 10 publications

(4 citation statements)

References 19 publications

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“…This relationship was maintained when limestone powder was added, but disturbed when fly ash was added. This reflects the different actions of fly ash and limestone powder in the mortar's internal structure [45]. However, with an increase in the replacement ratio of either fly ash or limestone powder, the mortar's tensile adhesive strength generally decreased.…”

Section: Tensile Adhesive Strengthmentioning

confidence: 99%

Reuse of Sintered Sludge from Municipal Sewage Treatment Plants for the Production of Lightweight Aggregate Building Mortar

Zhang

et al. 2021

Crystals

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In recent years, the sludge produced by municipal sewage treatment plants has become an important recyclable resource for producing green building materials. After the systematic processing of incineration and particle formation, the sintered sludge can be processed into fine lightweight aggregate to produce building mortar with the controlled leaching of heavy metals and radioactivity. In this paper, to increase its economic and environmental benefits, mortar with sintered sludge aggregate was made by cement admixing of fly ash or limestone powder. The water-to-binder ratio was set at three levels—0.82, 0.68, and 0.62—and either flay ash or limestone powder was used to replace equal masses of cement at 10%, 20%, or 30%. Eighteen groups of mortar were studied to evaluate their workability, air content, compressive strength, tensile adhesive strength, dry density, and thermal conductivity. The results indicate that with a proper water-to-binder ratio, and the replacement ratio of fly ash or limestone powder, the mortar can be produced with good workability, consistency, water-retention rate, layering degree, and setting time. The mortar made with sintered sludge lightweight aggregate, designated by the mix-proportion method for conventional lightweight aggregate mortar, did not meet the target strength, although the compressive strength of mortar was no less than 3.0 MPa, which meets the strength grade M2.5. The tensile adhesive strength reached 0.18 MPa. The mortar was super lightweight with a dry density less than 400 kg/m3, and a thermal conductivity within 0.30~0.32 W/(m⋅K). The effects of water-to-binder ratio and replacement ratio of fly ash or limestone powder on the above properties are discussed with test results. The study provides a basis for using sintered sludge lightweight aggregate for building mortar.

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Section: Tensile Adhesive Strengthmentioning

confidence: 99%

Reuse of Sintered Sludge from Municipal Sewage Treatment Plants for the Production of Lightweight Aggregate Building Mortar

Zhang

et al. 2021

Crystals

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“…With the advantage of high-degree industrialization, prefabricated shear walls will be common in high-rise buildings. However, contrary to cast-in-place shear walls, the prefabricated shear wall is always weakened by the post-cast joints, which cannot effectively transfer the deformation of structures [5,6]. This highlights that the reliability of post-cast joints is very important to ensure the integrity and bearing performance of structures.…”

Section: Introductionmentioning

confidence: 99%

“…The seismic behavior of the prefabricated shear walls was comprehensively evaluated in terms of concrete and reinforcement stress, failure mode, hysteresis curves, ductility, energy dissipation, stiffness degeneration, and bearing capacity. Because the bond of the straight interface between cast-in-place concrete and precast concrete is reliable without slip [6], shear walls with a straight cast-in-place vertical joint were used as a reference in the analysis. This allows us to deeply understand the seismic mechanisms of the prefabricated shear walls with cast-in-place vertical joints.…”

Section: Introductionmentioning

confidence: 99%

Seismic Behaviors of Prefabricated Reinforced Concrete Shear Walls Assembled with a Cast-in-Place Vertical Joint

Yang,

Deng

et al. 2023

Buildings

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The seismic performance of prefabricated reinforced concrete shear walls is a key point in the safety of the whole assembly structure under earthquake actions. In this study, six specimens of reinforced concrete shear walls were assembled with a cast-in-place vertical joint with a straight, L, or convex shape. The specimens were tested using a low cyclic loading test under an axial compression ratio of 0.2 or 0.3. The stress process, failure pattern, and hysteretic curve of each specimen were measured. Combined with a numerical analysis using the finite element method, the variations in the bearing capacity, stiffness degradation, ductility, and energy dissipation capacity of the tested specimens were analyzed. Results showed that all specimens failed in a shear pattern without an obvious failure phenomenon along the vertical joint. The hysteresis curves exhibited an obvious pinch phenomenon and good deformation ability. The seismic behavior decreased in sequence for the shear walls assembled with a cast-in-place vertical joint with a straight, L, or convex shape, while a higher axial compression ratio improved the bearing capacity of the shear walls. The shear wall with an L-shaped vertical joint had similar seismic behavior to that with a straight vertical joint, but the shear wall with a convex vertical joint exhibited a decrease of 8.5% and 10.9% in bearing capacity, 18.2% and 1.2% in ductility, and 13.1% and 20.6% in energy dissipation, respectively, under an axial compression ratio of 0.2 and 0.3. The bearing mechanisms of shear walls with different vertical joints are explained with the numerical analysis of the stress vector maps of concrete and the stress cloud maps of reinforcements at different stress levels.

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“…The paper by Li et al [17] investigates the structural behaviour of concrete joints, where an on-site cast concrete element is jointed with a precast wall. An extensive experimental activity accounts for the role played by (i) the strength grade of the concrete mixtures, (ii) the interface between precast and on-site cast concrete elements, and (iii) the storage time for the precast element.…”

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confidence: 99%

New Frontiers in Cementitious and Lime-Based Materials and Composites

et al. 2022

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Cement and lime currently are the most common binders in building materials. However, alternative materials and methods are needed to overcome the functional limitations and environmental footprint of conventional products. This Special Issue is entirely dedicated to “New frontiers in cementitious and lime-based materials and composites” and gathers selected reviews and experimental articles that showcase the most recent trends in this multidisciplinary field. Authoritative contributions from all around the world provide important insights into all areas of research related to cementitious and lime-based materials and composites, spanning from structural engineering to geotechnics, including materials science and processing technology. This topical cross-disciplinary collection is intended to foster innovation and help researchers and developers to identify new solutions for a more sustainable and functional built environment.

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Experimental Research on Interfacial Bonding Strength between Vertical Cast-In-Situ Joint and Precast Concrete Walls

Cited by 10 publications

References 19 publications

Reuse of Sintered Sludge from Municipal Sewage Treatment Plants for the Production of Lightweight Aggregate Building Mortar

Reuse of Sintered Sludge from Municipal Sewage Treatment Plants for the Production of Lightweight Aggregate Building Mortar

Seismic Behaviors of Prefabricated Reinforced Concrete Shear Walls Assembled with a Cast-in-Place Vertical Joint

New Frontiers in Cementitious and Lime-Based Materials and Composites

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