scholarly journals A New Composite Slab Using Crushed Waste Tires as Fine Aggregate in Self-Compacting Lightweight Aggregate Concrete

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2551 ◽  
Author(s):  
Jing Lv ◽  
Tianhua Zhou ◽  
Hanheng Wu ◽  
Liurui Sang ◽  
Zuoqian He ◽  
...  
Keyword(s):  
Ultimate Load ◽  
Bending Moment ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Flexural Properties ◽  
Aggregate Concrete ◽  
Composite Slab ◽  
Yield Load ◽  
Composite Slabs ◽  
Rubber Particles

A composite slab comprised of self-compacting rubber lightweight aggregate concrete (SCRLC) and profiled steel sheeting is a new type of structural element with a series of superior properties. This paper presents an experimental research and finite element analysis (FEA) of the flexural behavior of composite slabs consisting of SCRLC to develop a new floor system. Four composite slabs specimens with different shear spans (450 mm and 800 mm) and SCRLC (0% and 30% in rubber particles substitution ratio) are prepared, and the flexural properties including failure modes, deflection at mid-span, profiled steel sheeting, and concrete surface stain at mid-span and end slippage are investigated by four-point bending tests. The experimental results indicate that applying SCRLC30 in composites slabs will improve the anti-cracking ability under the loading of composite slabs compared with composite slabs consisting of self-compacting lightweight aggregate concrete (SCLC). FEM on the flexural properties of SCRLC composites slabs show that the yield load, ultimate load, and deflection corresponding to the yield load and the ultimate load of composite slabs drop as the rubber particles content increases in SCRLC. The variation of SCRLC strength has less impact on the flexural bearing capacity of corresponding composite slabs. Based on the traditional calculated method of the ultimate bending moment of normal concrete (NC) composite slabs, a modified calculated method for the ultimate bending moment of SCRLC composite slabs is proposed.

scholarly journals Fresh and Mechanical Properties of Self-Compacting Rubber Lightweight Aggregate Concrete and Corresponding Mortar

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Jing Lv ◽  
Qiang Du ◽  
Tianhua Zhou ◽  
Zuoqian He ◽  
Kunlun Li
Keyword(s):  
Compressive Strength ◽  
Shear Stress ◽  
Lightweight Aggregate ◽  
Segregation Ratio ◽  
Plastic Viscosity ◽  
Lightweight Aggregate Concrete ◽  
Replacement Ratio ◽  
Aggregate Concrete ◽  
Waste Tires ◽  
Rubber Particles

Increasing amount of waste tires caused huge environment issues in recent years. Recycling concrete is an effective way. In this paper, waste tires are crushed into particles and incorporated in lightweight aggregate concrete to prepare a special concrete (self-compacting rubber lightweight aggregate concrete (SCRLC)). A detailed experimental research of effects of rubber particles on the properties of SCRLC and corresponding mortar is conducted. The results show that increasing the rubber particles replacement ratio leads to a raising of yield stress and plastic viscosity of mortar pastes. Flowability, filling capacity, and passing ability of SCRLC decline and the segregation resistance property of SCRLC improves as the rubber particles replacement ratio increases. Well, linear correlations between slump flow of SCRLC and shear stress of corresponding mortar pastes and segregation ratio of SCRLC and plastic viscosity of corresponding mortar pastes are obtained. In order to ensure that rubber lightweight aggregate concrete can compact by itself, the upper limit of shear stress of corresponding mortar pastes is 231.7 Pa and the lower limit of plastic viscosity of corresponding mortar pastes is 3.72 Pa·s. Compressive strength, splitting tensile strength, flexural strength, and elastic modulus of SCRLC and compressive strength of corresponding mortar decrease as the rubber particles replacement ratio increases. The 28-day compressive strength of SCRLC can meet the requirements of lightweight aggregate concrete structures until the rubber particles replacement ratio reaches 50%.

Experimental Study on Bond Behavior of Profiled Steel Sheet-Lightweight Aggregate Concrete Composite Slab

2012 ◽  
Vol 594-597 ◽  
pp. 721-724
Author(s):  
Yan Kun Zhang ◽  
Yan Xiao Han ◽  
Ze Zao Song
Keyword(s):  
Experimental Study ◽  
Steel Sheet ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Aggregate Concrete ◽  
Composite Slab ◽  
Bond Behavior ◽  
Ordinary Concrete ◽  
Relationship Of ◽  
The Relationship

At present, there are much more researches on the ordinary concrete composite slab, and that on the lightweight aggregate concrete composite slab are relatively less. In this paper, the shear-bond behavior of lightweight aggregate concrete composite slab, with the profiled steel sheet YX-76-344-688, which is commonly used in China is studied. Base on experiments, the cracks developing process and its regularities of distribution, the bonding and slipping between profiled sheeting and concrete, the relationship of load and mid-span deflection, ultimate bearing capacity etc. are studied.

Shrinkage Performance and Cracking Resistance Mechanism of Rubberized Lightweight Aggregate Concrete with Polymer

2008 ◽  
Vol 385-387 ◽  
pp. 817-820 ◽  
Author(s):  
Ji Wang ◽  
Yue Li ◽  
Ming Zhong Zhang
Keyword(s):  
Resistance Mechanism ◽  
Lightweight Aggregate ◽  
Shrinkage Rate ◽  
Cement Matrix ◽  
Lightweight Aggregate Concrete ◽  
Cracking Resistance ◽  
Aggregate Concrete ◽  
Rubber Particles ◽  
Interface Transition Zone ◽  
Energy Absorbing

To improve the cracking resistance of lightweight aggregate concrete, rubber particles and polymer were added. Experimental results showed that the shrinkage rate increased when rubber particles were added into lightweight aggregate concrete, but when polymer was mixed, the shrinkage rate decreased dramatically. Microstructure analysis indicated that the interface transition zone (ITZ) influenced the shrinkage performance of rubberized lightweight aggregate concrete with polymer directly; the ITZ bondage between rubber particles and cement matrix was very poor and the restriction to shrinkage was weak, which were the main reasons for the increase of shrinkage rate of rubberized lightweight aggregate concrete; when polymer was mixed into the concrete, the hole and ITZ structure of concrete were improved, which made the strain energy absorbing function of rubber particles can be exerted entirely and the flexibility of ITZ was boosted, thereby the shrinkage performance and cracking resistance of lightweight aggregate concrete were improved.

Experiment of the Mechanical Performance of Reinforced Ceramsite Lightweight Aggregate Concrete Beams after Fire

2012 ◽  
Vol 594-597 ◽  
pp. 2219-2222
Author(s):  
Jian Min Wang ◽  
Neng Jun Wang ◽  
Li Li Yuan ◽  
Wen Ting Jiang
Keyword(s):  
Ultimate Load ◽  
Mechanical Performance ◽  
Lightweight Aggregate ◽  
Bending Test ◽  
Lightweight Aggregate Concrete ◽  
Reinforcing Bars ◽  
Shear Tests ◽  
Loading Test ◽  
Aggregate Concrete ◽  
Transverse Loads

The effect of fire exposure on the mechanical performance of reinforced ceramsite lightweight aggregate concrete was investigated. Two groups of beams were cast at the same time, exposed to fire at about 800 °C and then naturally cooled. The beams were tested by applying two point transverse loads incrementally. The load-deflection relationships both of bending and shear tests were recorded. For bending test, the disappearance of crack turning points in the loading curves, reduction of yielding and ultimate loads, and increase in deflection were observed. The reduction of ultimate load and increase in deflection of beams after fire in shear test were also observed. After loading test, the load-deflection relationships of main reinforcing bars and stirrups were tested to discuss the effect of fire on the reinforcing bars in beams.

scholarly journals The Structural Characteristics of Lightweight Aggregate Concrete Beams

2019 ◽  
Vol 27 (2) ◽  
pp. 64-73
Author(s):  
Sajjad abdulameer Badar ◽  
Laith Shakir Rasheed ◽  
Shakir Ahmed Salih
Keyword(s):  
Compressive Strength ◽  
Ultimate Load ◽  
Lightweight Concrete ◽  
Concrete Beams ◽  
Lightweight Aggregate ◽  
Normal Weight ◽  
Lightweight Aggregate Concrete ◽  
Dry Density ◽  
Aggregate Concrete ◽  
Clay Bricks

This paper aims to investigate the structural behavior of reinforced lightweight concrete beams. Attapulgite aggregate and crushed clay brick aggregate were used as coarse lightweight aggregate to produce structural lightweight aggregate concrete with 25 Mpa and 43.6 Mpa cube compressive strength and 1805 Kg/m3 and 1977 Kg/m3 oven dry density respectively. The result of reinforced lightweight concrete beams compared with reinforced normal weight concrete beams, which have 50.5 Mpa cylinder compressive strength and 2317 Kg/m3 oven dry density. For each type of concrete two reinforced concrete beams with (1200 mm length × 180 mm height × 140 mm width), one of them tested under symmetrical two-points load STPL (a/d = 2.2) and another one tested under one-point load OPL (a/d=3.3) at 28 days. The experimental program shows that a structural lightweight aggregate concrete can be produced by using Attapulgite aggregate with 25 MPa cube compressive strength and 1805 Kg/m3 oven dry density and by using crushed clay brick aggregate with 43.6 MPa cube compressive strength and 1977 Kg/m3 oven dry density. The weight of Attapulgite aggregate concrete and crushed clay bricks aggregate concrete beam specimens were lower than normal weight aggregate concrete beams by about 20.56% and 13.65% respectively at 28 days.  As for the ultimate load capacities of beam specimens, the ultimate load of Attapulgite aggregate concrete beams tested under STPL were lower than that of crushed clay bricks aggregate concrete beams and normal weight aggregate concrete beams by about 4.85% and 5% respectively. While the ultimate load capacities of reinforced Attapulgite concrete beams tested under OPL were lower than that of reinforced crushed clay bricks aggregate concrete beams and reinforced normal weight aggregate concrete beams by about 10.3% and 10.5% respectively. Finally, Attapulgite aggregate concrete and crushed clay bricks aggregate concrete showed ductility and toughness less than that of Normal weight aggregate concrete.

scholarly journals Evaluation of Stress–Strain Behavior of Self-Compacting Rubber Lightweight Aggregate Concrete under Uniaxial Compression Loading

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4064 ◽  
Author(s):  
Jing Lv ◽  
Tianhua Zhou ◽  
Qiang Du ◽  
Kunlun Li ◽  
Kai Sun
Keyword(s):  
Compressive Strength ◽  
Failure Modes ◽  
Experimental Studies ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Peak Strain ◽  
Stress Strain ◽  
Aggregate Concrete ◽  
Rubber Particles ◽  
Strain Relationship

The recycling of waste tires in lightweight aggregate concrete (LC) would achieve huge environmental and societal benefits, but the effects of rubber particles on the partial properties of LC are not clear (e.g., the stress–strain relationship). In this paper, uniaxial compressive experiments were conducted to evaluate the stress–strain relationship of self-compacting rubber lightweight aggregate concrete (SCRLC). Rubber particles were used to replace sand by volume, and substitution percentages of 0%, 10%, 20%, 30%, 40%, and 50% were set as influence factors. Experimental results indicate that with increased rubber particles substitution percentage, the cubic compressive strength and axial compressive strength of SCRLC decreased, while the failure modes of SCRLC prism specimens gradually changed from brittle to ductile failure. As the rubber particles substitution percentage increased from 0% to 50%, the peak strain of SCRLC increased whereas peak stress, elastic modulus, and peak secant modulus of SCRLC deceased, the descending stage of stress–strain curves became softer. The rubber particles substitution percentage of 30% was the critical point at which an obvious change in the properties of SCRLC occurred. Based on the data collected from experimental studies, a predictive model for SCRLC was established and a further prediction of the SCRLC stress–strain relationship was given.

The Experimental Research of New Lightweight Steel Composite Slab

2012 ◽  
Vol 188 ◽  
pp. 157-161
Author(s):  
Dian Zhong Liu ◽  
Shi Hao Tian
Keyword(s):  
Bearing Capacity ◽  
Strain Curve ◽  
Steel Structure ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Aggregate Concrete ◽  
Composite Slab ◽  
Composite Sandwich ◽  
Steel Cast ◽  
Thin Walled

The new composite sandwich slab of the cold formed thin-walled steel and lightweight aggregate concrete is studied. The composite sandwich slab is a skeleton of cold formed thin-walled steel, cast-in-situ lightweight aggregate concrete, built-in benzene board as a sandwich layer. The composite sandwich slab has a light weight, seismic performance is good, and construction period is short of advantage, can effectively solve poor shortcomings of the steel structure fireproofing performance and corrosion resistance, and can effectively improve the whole and local stability of the steel structure. The composite sandwich slab bearing capacity of the cold formed thin-walled steel and lightweight aggregate concrete is analyzed using simple plastic theory. The deflection to consider interface slip of the composite slab is computed. The composite sandwich slab is tested statically; the failure mechanism of the slab is analyzed. The load-deflection curve, load-strain curve are obtained. The sandwich rate of the slab on the influence of the bearing capacity is analyzed using the finite element method, and theoretical with experimental results comparatively analyzed.

Simulation Analysis of Longitudinal Shear Bond Performance of Lightweight Aggregate Concrete Composite Slab

2013 ◽  
Vol 351-352 ◽  
pp. 446-449
Author(s):  
Yan Kun Zhang ◽  
Ze Zhao Song
Keyword(s):  
Mathematical Model ◽  
Simulation Analysis ◽  
Lightweight Aggregate ◽  
Longitudinal Shear ◽  
Lightweight Aggregate Concrete ◽  
Element Analysis ◽  
Aggregate Concrete ◽  
Composite Slab ◽  
Bond Performance ◽  
Combined Action

Because of the experiment can only reflect the overall performance of composite slabs under the various parameters combined action, and to ensure the materiality level of one single parameter, ANSYS, one of the finite element analysis software, was used in analogue simulation. According to selected reasonable elements and generated contact elements where between profiled steel sheet and lightweight aggregate concrete, appropriate mathematical model was been built. With full Newton-Raphson method to calculate nonlinear equation, the relevant data and curves were been obtained. Through the comparison between simulation analysis results and experiment results, the mathematical model was verified that it could reflect experiment correctly. These studies could provide assistance in the lightweight aggregate concrete composite slab project finally.

scholarly journals Shrinkage Properties of Self-Compacting Rubber Lightweight Aggregate Concrete: Experimental and Analytical Studies

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4059
Author(s):  
Jing Lv ◽  
Tianhua Zhou ◽  
Kunlun Li ◽  
Kai Sun
Keyword(s):  
Analytical Study ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Research Model ◽  
Aggregate Concrete ◽  
Upper Limit ◽  
Analytical Studies ◽  
China Academy ◽  
Rubber Particles ◽  
Limiting Value

The shrinkage properties of self-compacting rubber lightweight aggregate concrete (SCRLC) were investigated by experimental and analytical studies in this paper. Rubber particles were used to substitute the sand in SCRLC by volume and rubber particles substitution percentages were 10%, 20%, 30%, 40% and 50%. The experimental results showed that the shrinkage strains of SCRLC increased with an increase of rubber particles substitution percentage. On the basis of China Academy of Building Research model and experimental data, a predictive model for describing the shrinkage strains of SCRLC was established. After analytical study, it was revealed that rubber particles substitution percentage of 80% in SCRLC might be the upper limit of substitution percentage; if the rubber particles substitution percentage was larger than 80%, the shrinkage strains of SCRLC would exceed the limiting value stipulated in JGJ51-2002 and the durability of SCRLC would drop to a worse status.

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