Flexural behavior of precast ultra-lightweight ECC-concrete composite slab with lattice girders

Deng, Bo-Yu; Tan, Di; Li, Ling-Zhi; Zhang, Zhi; Cai, Ziwei; Yu, Kequan

doi:10.1016/j.engstruct.2022.115553

Cited by 37 publications

(4 citation statements)

References 54 publications

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“…Experimental results supported that the design had a high bi-directional vertical bearing capacity. Additionally, a test on lightweight engineering cementitious composite-normal concrete precast slabs with lattice girders by Deng et al [22] confirmed that such a composite system reduced its self-weight and improved the flexural performance. Similarly, the flexural behavior of steel-concrete ultra-shallow floor beams with precast hollow-core slabs was established and studied to overcome the shortcomings of the need for heavier steel profiles, maximizing costs, and higher floor sections with the increase in span.…”

Section: Introductionmentioning

confidence: 93%

Flexural Performances of Novel Wet Joints with Sleeve Connections in Precast Composite Floor System

Zhang,

Feng,

Zeng

et al. 2024

Buildings

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A new type of assembled integral multi-ribbed composite floor system with novel wet joint and steel sleeve connections, which exhibits satisfactory strength and stiffness, was proposed in the previous study. To further study the flexural performances of the joints, six groups of specimens, including two cast in situ concrete slabs and four composite slabs sized 4700 mm × 1200 mm × 300 mm and 2450 mm × 1200 mm × 300 mm, were investigated under four-point flexural tests. Four main influence factors were experimentally studied, i.e., casting methods, joint amounts, shear span lengths, and steel sleeve layout directions, on the failure modes, crack distributions, and deflection–load carrying capacity relationship. Test results indicated that the proposed composite slab system could provide the ultimate bearing capacity lower by 7% than that of the cast in situ concrete slabs, largely exceeding the code-predicted strength. No strain difference between the steel sleeve connections and steel rebars indicated good wet joint connection behavior. More hollow-core sections and long shear spans increased the potential of interfacial splitting cracks, leading to a shorter elastic stage and lower elastic stiffness. A finite element model was further parametrically conducted to explore the structural performances. Finite element results also indicate that the precast concrete slab had a more significant influence on the failure loads than the influences of concrete compressive strength and lap-splice steel rebar strength. These findings indicate that the proposed composite slab systems possess a satisfactory performance in the ultimate bearing capacity and deformability. Thus, such an assembled integral multi-ribbed composite floor system can be widely applied in construction.

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Section: Introductionmentioning

confidence: 93%

Flexural Performances of Novel Wet Joints with Sleeve Connections in Precast Composite Floor System

Zhang,

Feng,

Zeng

et al. 2024

Buildings

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“…Therefore, the cost of formwork can be minimized. Deng et al [9] synthesized other investigations [8,[10][11][12][13] and showed that the precast RC composite slab with inclined steel truss bars acquires beneficial features of both precast and RC slabs cast in situ, containing high construction efficiency and cost savings, high integrity, high reliability, and comparable mechanical behavior to that of popular slabs cast in situ. These studies also pointed out that the inclined steel truss bars have an insignificant impact on the load-carrying capacity but can greatly improve the ductility of the RC composite slab.…”

Section: Introductionmentioning

confidence: 97%

Experimental Study on Flexural Behavior of RC–UHPC Slabs with EPS Lightweight Concrete Core

et al. 2023

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This paper presents an experimental investigation that focuses on the flexural behavior of an innovative reinforced concrete–ultra-high performance concrete slab with an expanded polystyrene lightweight concrete core. This type of slab is proposed to serve the semi-precast solution, in which the bottom layer is ultra-high performance concrete working as a formwork during the construction of semi-precast slab, the expanded polystyrene lightweight concrete layer is used for the reduction of structure self-weight, and the top layer is normal concrete designed to withstand compressive stress when the slab is loaded. Two similar large-scale specimens with dimensions of 6200 mm × 1000 mm × 210 mm were fabricated and tested under four-point bending conditions to investigate the flexural behavior of composite slab. Test results indicated that three different layers of materials can work effectively together without separation. The bottom ultra-high performance concrete layer leads to the high ductility of the slab and has a good effect in limiting the widening of the crack width by forming other cracks. According to design code ACI 544.4R, a modified distribution stress diagram on the composite section was proposed and proven to be suitable for the prediction of flexural strength of the composite section with an error of 3.4% compared to the experimental result. The effect of the ultra-high performance concrete layer on the flexural strength of the composite slab was clearly demonstrated, and for the case in this study, the ultra-high performance concrete layer improves the flexural strength of the slab by about 11.5%.

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“…A viable solution to mitigate this brittleness involves incorporating fiber-enhanced materials into geopolymer concrete, enhancing its structural integrity. This approach has led to the development of Engineering Geopolymer Composite (EGC) materials, characterized by their high ductility and capacity to develop multiple micro-cracks when subjected to loading [ 12 , 13 ]. Notably, EGC materials exhibit distinct strain-hardening behavior, significantly enhancing the deformability of geopolymers [ 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Stress–Strain Relationship of PVA-Fiber-Reinforced Engineered Geopolymer Composite

Zhou,

Li,

Liu

et al. 2024

Polymers

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In this study, seven Engineering Geopolymer Composite (EGC) groups with varying proportions were prepared. Rheological, compressive, flexural, and axial tensile tests of the EGC were conducted to study the effects of the water/binder ratio, the cement/sand ratio, and fiber type on its properties. Additionally, a uniaxial tension constitutive model was established. The results indicate that the EGC exhibits early strength characteristics, with the 7-day compressive strength reaching 80% to 92% of the 28-day compressive strength. The EGC demonstrates high compressive strength and tensile ductility, achieving up to 70 MPa and 4%, respectively. The mechanical properties of the EGC improved with an increase in the sand/binder ratio and decreased with an increase in the water/binder ratio. The stress–strain curve of the EGC resembles that of the ECC, displaying a strain-hardening state that can be divided into two stages: before cracking, the matrix primarily bears the stress; after cracking, the slope decreases, and the fiber predominantly bears the stress.

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Flexural behavior of precast ultra-lightweight ECC-concrete composite slab with lattice girders

Cited by 37 publications

References 54 publications

Flexural Performances of Novel Wet Joints with Sleeve Connections in Precast Composite Floor System

Flexural Performances of Novel Wet Joints with Sleeve Connections in Precast Composite Floor System

Experimental Study on Flexural Behavior of RC–UHPC Slabs with EPS Lightweight Concrete Core

Mechanical Properties and Stress–Strain Relationship of PVA-Fiber-Reinforced Engineered Geopolymer Composite

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