Mechanical Performance Research on Modified Cement Concrete with Recycled Plastic Particles

2012 ◽  
Vol 450-451 ◽  
pp. 650-654
Author(s):  
Jian Hong Di ◽  
Zhan Liang Liu ◽  
Jun Jun Li
Keyword(s):  
Mechanical Performance ◽  
Cement Concrete ◽  
Performance Research

Mechanical Performance Research on Modified Cement Concrete with Recycled Plastic Particles

2012 ◽  
Vol 450-451 ◽  
pp. 650-654
Author(s):  
Jian Hong Di ◽  
Zhan Liang Liu ◽  
Jun Jun Li
Keyword(s):  
Bending Strength ◽  
Mechanical Performance ◽  
Research Result ◽  
Basic Material ◽  
Fine Aggregate ◽  
Cement Concrete ◽  
Performance Indexes ◽  
Mechanical Strengths ◽  
Performance Research ◽  
Addition Amount

In order to improve the concrete performance and research the greenmaterial, the recycled ABS/PC plastic particles will be added into the cement concrete as a modifier. In this research, the C30 cement concrete was taken as the basic material, the fine aggregate in cement concrete was substituted by different amounts of recycled plastic particles. The change law of mechanical performance indexes（including cubic compressive strength. Splitting tensile strength，bending strength）were researched. The research result showed the recycled plastic particles, as a modifier, can improve mechanical performance of the cement concrete greatly. In the five addition amounts，including 0%, 2%, 5%, 8%, 11%，the three mechanical strengths will all increases at first then decreases with the addition amount increasing. When the addition amount is 5%, the three mechanical strength indexes will all reach the maximum.

The Analysis of Hysteretic Behavior of Concrete Filled Double Skin Steel Tubular after Exposure to Fire

2014 ◽  
Vol 580-583 ◽  
pp. 2675-2678 ◽  
Author(s):  
Xiao Liu ◽  
Jun Tao Bao ◽  
Bing Wang
Keyword(s):  
Mechanical Properties ◽  
Seismic Performance ◽  
Mechanical Performance ◽  
Economic Loss ◽  
Hysteretic Behavior ◽  
Fire Performance ◽  
Seismic Capacity ◽  
Double Skin ◽  
Performance Research

In recent years,frequent fires and earthquake make the buildings damage badly,and it causes huge economic loss. Concrete filled double skin steel tubular (Hereinafter referred to as CFDST) as a new member of structure,its mechanical properties are similar to concrete filled steel tubular,at the same time has better fire performance and seismic capacity. Based on this background,the paper expounds study the mechanical performance of CFDST is very important,the hysteretic behavior is the main mechanical indexes of the seismic performance of CFDST after exposure to fire. The study of it will fill the new component in the blank of seismic performance research.

scholarly journals Mechanical Performance of Single-Graded Copolymer-Modified Pervious Concrete in a Corrosive Environment

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7304
Author(s):  
Chaohua Zhao ◽  
Xiaoyao Jia ◽  
Zhijian Yi ◽  
Hualin Li ◽  
Yi Peng
Keyword(s):  
Tensile Strength ◽  
Mechanical Performance ◽  
Mass Loss Rate ◽  
Mechanical Tests ◽  
Pervious Concrete ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Cement Concrete ◽  
Flexible Polymer ◽  
Special Cases

Polymer-modified cement has found numerous applications due to its excellent tensile strength. When cement was modified with a single polymer, its tensile strength and performance marginally increased. However, when a small amount of the flexible polymer latex was added to cement, the mechanical performance of cement considerably improved. In this study, single-graded copolymer-modified pervious concrete was prepared by mixing styrene-butadiene rubber (SBR) with different acrylate polymers, and its mechanical performance and durability were systematically studied through mechanical tests and theoretical analyses. The main findings are as follows: (1) When a waterborne emulsion was added, the freeze resistance of cement concrete increased, and its mass loss rate decreased. Cement concrete with two latexes had higher sulphate corrosion resistance and substantially lower dry shrinkage strain than ordinary cement concrete. (2) Through scanning electron microscopy, the microstructural changes in the cement binder, ordinary polymer-modified concrete, and the copolymer-modified cement concrete used in this study were observed, and the findings were compared with those reported in the literature. (3) Single-graded copolymer-modified pervious concrete exhibited excellent shrinkage performance. This study showed that single-graded copolymer-modified pervious concrete satisfied the performance requirements for use as a paving material for special cases.

Research on Mechanical Performance of Sisal Fiber Reinforced Concrete and its Mechanism

2010 ◽  
Vol 168-170 ◽  
pp. 925-930 ◽  
Author(s):  
Hui Ming Bao ◽  
Shang Li
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Failure Mechanism ◽  
Fracture Process ◽  
Mechanical Performance ◽  
Fiber Reinforced Concrete ◽  
Sisal Fiber ◽  
Fiber Reinforced ◽  
Cement Concrete ◽  
Bonding Property

According to experiments by comparing with normal cement concrete and other fiber reinforced concrete, they analyze the mechanical properties and features of sisal fiber reinforced concrete. Besides, they observe the fracture process of different ages and contents of sisal fiber reinforced concrete and analyze the bonding property, toughening effect and failure mechanism. The results show that sisal fiber reinforced concrete is superior to normal cement concrete on mechanical properties, and has a feature of multi-cracking, while compared with other fiber reinforced concrete, it is more economical.

scholarly journals Life Cycle Assessment of alkali activated materials: preliminary investigation for pavement applications

2021 ◽  
Vol 6 ◽  
pp. 124-130
Author(s):  
Francesca Lolli ◽  
Kimberly E. Kurtis
Keyword(s):  
Global Warming ◽  
Global Warming Potential ◽  
Capital Investment ◽  
Mechanical Performance ◽  
Preliminary Investigation ◽  
Raw Material ◽  
Cement Concrete ◽  
Usual Practice ◽  
The Impact ◽  
Alkali Activated

The capital investment in the US for construction and maintenance of the infrastructure road network is $150 billion/year. Investments in OECD countries will likely stabilize, while other countries will face an exponential growth of investments for infrastructures driven by the development of metropolitan cities. Continued “business-as-usual” practice for portland and asphalt cement concrete pavement construction ignores the increasing warning calls for the identification of more sustainable and less energy intensive paving materials. Alkali activated materials concrete (AAM) have been studied with growing interest during the last three decades. AAM show promising results in terms of mechanical performance, while also having a global warming potential impact 30-80% less than that of portland cement concrete. The global warming potential of AAM is closely dependent on the: 1) activating solution used to activate the raw material and 2) origin of the raw material. Specifically, the impact of the transport for both of these components is ~ 10% of its global warming potential. Hence, to increase the adoption of AAM for pavements, it is fundamental to analyze the existing literature to clarify the link between environmental impact and mechanical performance, identifying opportunities for applications that are tailored to the local availability of raw material.

scholarly journals Effects of the Foil Centering on the Irradiation Performance of U10Mo Alloy Based Monolithic Mini-Plates

2015 ◽  
Author(s):  
Jill Wright ◽  
Hakan Ozaltun
Keyword(s):  
High Performance ◽  
Mechanical Performance ◽  
Foil Thickness ◽  
Operational Variables ◽  
Total Magnitude ◽  
Irradiation Performance ◽  
Fuel Elements ◽  
Performance Research ◽  
Cladding Material ◽  
Plate Type

Monolithic plate-type fuel is a fuel form being developed for high performance research and test reactors to minimize the use of enriched material. These plate-type fuels consist of a high uranium density LEU foil contained within diffusion barriers and encapsulated within a cladding material. To benchmark this new design, effects of various geometrical and operational variables on irradiation performance have been evaluated. For this work, the effects of fuel foil centering on the thermo-mechanical performance of the mini-plates were studied. To evaluate these effects, a selected plate from RERTR-12 experiments, the Plate L1P756, was considered. The fuel foil was moved within the fuel plate to study the effects of the fuel centering on stress, strain and overall shape of the fuel elements. The thickness of the fuel foil, thickness of the Zr-liners and total thickness of the plate were held constant, except the centerline alignment of the fuel foil. For this, the position of the fuel foil was varied from the center position to a maximum offset corresponding to the minimum allowable aluminum cladding thickness of 0.1524 mm. Results for various offset cases were then compared to each other and to the ideal case of a centered fuel foil. Fabrication simulations indicated that the thermal expansion mismatch results in warping of the fuel plate during fabrication as the fuel plate is cooled from the HIP temperature when the fuel is not centered. Even if the model is constrained during cooling to simulate the rigid HIP can surrounding the fuel plate during cooling, warping is observed when the constraint is removed. Similarly, irradiation simulations revealed that the fuel offset causes virtually all irradiation-induced swelling to occur on the thin-cladding side of the plate. This is observed even for the smallest offset that was considered. The total magnitude of the swelling is approximately same for all offsets values.

scholarly journals Mechanical Performance Test of Rubber-Powder Modified Concrete

2018 ◽  
Vol 38 ◽  
pp. 03006
Author(s):  
Yan Cong Zhang ◽  
Ling Ling Gao
Keyword(s):  
Compressive Strength ◽  
Performance Test ◽  
Linear Growth ◽  
Mechanical Performance ◽  
Cement Concrete ◽  
Growth Trend ◽  
Cement Ratio ◽  
Rubber Powder ◽  
Fine Aggregates ◽  
Rubber Cement

A number of rubber cement concrete specimens that rubber powder dosage different were obtained using same cement, water and fine aggregates, by adjusting the dosage of rubber powder. Then it was used to research the influence of rubber powder dosage on performance of cement concrete by measuring its liquidity, strength and toughness. The results show that: when water-cement ratio was equal and rubber powder replacing the same volume sand, the fluidity of cement concrete almost linear increased with rubber powder dosage increasing. With dosage of rubber powder increasing, compressive strength and flexural strength reduced, but toughness linear growth trend when dosage of rubber powder less 30%.

Recycled Concrete Mixes for Slip-Form Paving of Roads and Airports

2016 ◽  
Vol 711 ◽  
pp. 730-736
Author(s):  
Maurizio Crispino ◽  
Emanuele Toraldo ◽  
Filippo Giustozzi ◽  
Edoardo Mariani
Keyword(s):  
Mechanical Performance ◽  
Recycled Concrete ◽  
Concrete Slabs ◽  
Cement Concrete ◽  
Concrete Aggregates ◽  
Recycled Concrete Aggregates ◽  
Plastic Concrete ◽  
Fresh State ◽  
Concrete Mix ◽  
High Production

Slip-form paving is gaining consensus in road and airport construction due to high production rates and automation of the process. Concrete slabs are extruded by pulling the forms continuously through and surrounding the plastic concrete mass. The technology uses low-slump cement concrete mixes so that the fresh mass is able to hold its shape once the slip-form paver has passed; besides low-slump, several other parameters should be considered for a proper slip-form concrete mix, especially at the fresh state. To date, recycling is being commonly adopted in concrete mixes to address sustainability in construction of transport infrastructures. Recycled Concrete Aggregates (RCA) are used to reduce the consumption of virgin materials although their increased porosity leads to higher absorption and generally lower mechanical performance. The present study aimed at evaluating the compatibility of 100% recycled concrete mixes with slip-form paving; recycled concrete was tested to evaluate the fresh-state properties as well as the hardened strength. Results showed that slip-form effective and high-resistance mixes could be prepared by using high content of RCA.

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