scholarly journals An Experimental Study for the Strength Variations of High-strength Lightweight Concrete According to Grain-size of Artificial Lightweight Aggregate

2011 ◽  
Vol 15 (5) ◽  
pp. 209-217
Author(s):  
Sung Chil Kim ◽  
Ki Chan Park ◽  
Hyoung Wook Choi
Keyword(s):  
Experimental Study ◽  
Grain Size ◽  
Lightweight Concrete ◽  
Lightweight Aggregate ◽  
High Strength

Effect of confinement on the behaviour of high-strength lightweight concrete columns

1986 ◽  
Vol 13 (6) ◽  
pp. 741-751 ◽  
Author(s):  
R. Basset ◽  
S. M. Uzumeri
Keyword(s):  
Experimental Investigation ◽  
Lightweight Concrete ◽  
Concrete Strength ◽  
Lightweight Aggregate ◽  
High Strength ◽  
Concrete Columns ◽  
Lightweight Aggregate Concrete ◽  
Test Results ◽  
Aggregate Concrete ◽  
Concrete Confinement

This paper summarizes an experimental investigation into the behaviour of high strength sand – lightweight concrete columns confined with rectangular ties. Fifteen reinforced and three unreinforced specimens were tested under monotonically increasing axial compression. Variables considered in this study were the longitudinal steel distribution and tie configuration, the tie steel spacing, the amount of tie steel, and the amount of longitudinal steel.The results indicated that unconfined high-strength lightweight aggregate concrete is a brittle material. The addition of lateral confining steel significantly improved the behaviour of this material, with a large amount of lateral steel resulting in very ductile behaviour. The tie configuration and resulting distribution of longitudinal steel contributed significantly to the confinement of concrete, with well-distributed steel resulting in improved behaviour. The ratio of specimen to cylinder concrete strength was observed to be 0.98, which is much higher than the commonly assumed value of 0.85.The test results were compared with results from selected theoretical confinement models. Based on the results of this investigation, existing models for concrete confinement give unconservative results for high-strength lightweight aggregate concrete and overestimate the ductility that can be achieved with this material. Key words: columns, confinement, ductility, high-strength concretes, lightweight aggregate concretes, reinforcement, stress–strain relationships, tests, ties, toughness.

scholarly journals Optimum Oil Palm Shell Content as Coarse Aggregate in Concrete Based on Mechanical and Durability Properties

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Mehdi Maghfouri ◽  
Payam Shafigh ◽  
Muhammad Aslam
Keyword(s):  
Oil Palm ◽  
Coarse Aggregate ◽  
Lightweight Concrete ◽  
Drying Shrinkage ◽  
Lightweight Aggregate ◽  
High Strength ◽  
Normal Weight ◽  
Concrete Mixture ◽  
Palm Shell ◽  
Oil Palm Shell

Oil palm shell (OPS) is a biosolid waste in palm oil industry in the tropical countries which could be used as aggregate in concrete mixture. Since 1984, OPS has been experimented as natural lightweight aggregate in research studies to produce lightweight concrete (LWC). Medium and high-strength LWCs using OPS as coarse aggregate were successfully produced. However, higher drying shrinkage and lower mechanical properties for concretes containing higher volume of OPS are reported in previous studies. Therefore, OPS is not fit to be used as full coarse aggregate in concrete mixture and therefore, there should be an optimum OPS content in concrete. In this study, in a normal-weight concrete, normal coarse aggregate was replaced with OPS from zero to 100% with an interval of 20%. Tests such as slump, density, compressive strength in different curing conditions, splitting tensile strength, initial and final water absorptions, and drying shrinkage of cured and uncured specimens were conducted to find out optimum OPS content in concrete. From the test results, it could be summarized that OPS content should not exceed 60% of total volume of coarse aggregate.

Qualities of High-Strength Lightweight Concrete Used for Construction of Arctic Offshore Platform

1990 ◽  
Vol 112 (1) ◽  
pp. 27-34 ◽  
Author(s):  
D. Tachibana ◽  
M. Imai ◽  
T. Okada
Keyword(s):  
Arctic Ocean ◽  
Lightweight Concrete ◽  
Lightweight Aggregate ◽  
High Strength ◽  
The Arctic ◽  
Oil Exploration ◽  
Freezing And Thawing ◽  
Freeze Thaw ◽  
The Arctic Ocean ◽  
Exploration And Production

Concrete employed in oil exploration and production platforms for use in shallow offshore zones of the Arctic Ocean is required to be lightweight, yet high strength, and moreover possess adequate resistance to freezing and thawing. Generally speaking, lightweight concrete, using artificial lightweight aggregate, has lower freeze-thaw resistance and this presents a serious problem. The study reported here was carried out on the freeze-thaw durability, constructibility and other properties of high-strength lightweight concrete. This paper especially points out the governing factors influenzing freeze-thaw durability of this type of concrete and describes a method of manufacturing concrete possessing superior durability.

Preparation Test Study on High Strength Lightweight Concrete in Engineering Materials

2013 ◽  
Vol 648 ◽  
pp. 55-58
Author(s):  
Xiao Qing Yu ◽  
Mao Lin ◽  
Guang Long Geng ◽  
Yue Han Li ◽  
Li Jia
Keyword(s):  
Rate Ratio ◽  
Coarse Aggregate ◽  
Lightweight Concrete ◽  
Lightweight Aggregate ◽  
High Strength ◽  
Lightweight Aggregate Concrete ◽  
Aggregate Concrete ◽  
Cement Ratio ◽  
Test Study ◽  
Aggregate Rate

Low and easy brittle characteristics of lightweight aggregate concrete tensile strength, shear strength, combined with high strength lightweight concrete requirements in the selection select strength Lytag, silica fume, superplasticizer material, preparationhigh strength lightweight aggregate concrete. Experimental study on the water-cement ratio, coarse aggregate rate ratio factors on the strength of lightweight aggregate concrete.

scholarly journals Pumpability of High Strength Lightweight Concrete Using Artificial Lightweight Aggregate

2003 ◽  
Vol 41 (12) ◽  
pp. 36-43
Author(s):  
H. Otsuka ◽  
K. Tsukahara ◽  
Y. Nakao ◽  
Y. Sato
Keyword(s):  
Lightweight Concrete ◽  
Lightweight Aggregate ◽  
High Strength

scholarly journals Effect of Aggregate Size on Strength Characteristics of High Strength Lightweight Concrete

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1314
Author(s):  
Hui Wei ◽  
Yang Liu ◽  
Tao Wu ◽  
Xi Liu
Keyword(s):  
Compressive Strength ◽  
Lightweight Concrete ◽  
Aggregate Size ◽  
Lightweight Aggregate ◽  
High Strength ◽  
Medium Size ◽  
Test Results ◽  
Estimation Model ◽  
Strength Tests ◽  
Single Size

Effects of aggregate size on the mechanical properties of lightweight concrete (LC) were investigated. Four gradings of lightweight aggregate (LWA) were designed and used to prepare the specimens for compressive strength, splitting tensile strength, and flexural strength tests. An estimating method for compressive strength of LC was then established. The compressive strength of tested LC was up to 95 MPa at 90-day curing time. The test results suggested that the absence of medium-size particles decreased the compaction of LC, therefore the density and compressive strength were negatively affected. Specimens having single size of aggregate showed lower splitting tensile and flexural strengths than that having three sizes of LWA. The parameters of the estimating model were determined according to the test results, and the compressive strength predictions of estimation model were compared with the results from other literature.

Experimental Study of Post-Fire Bearing Capacity of a Profiled Sheet-Lightweight Aggregate Concrete Composite Floor

2011 ◽  
Vol 368-373 ◽  
pp. 906-910
Author(s):  
Ping Xin Sun ◽  
Xin Tang Wang ◽  
Hong Liang Sun
Keyword(s):  
Experimental Study ◽  
Bearing Capacity ◽  
Lightweight Concrete ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Dead Load ◽  
Fire Load ◽  
Aggregate Concrete ◽  
Distributed Load ◽  
And Performance

In order to study the post-fire bearing capacity and performance of the profiled sheet-light aggregate concrete composite floor after exposure to fire load, experimental study of post-fire bearing capacity of a profiled sheet-ceramsite concrete composite floor subjected to dead load, which has no shearing nails, is carried out here. Based on the experimental results, the post-fire bearing capacity of the composite floor after exposure to fire is analyzed. It is shown that the failure form of the profiled sheet-lightweight concrete composite floor after exposure to fire has obvious change compared with the floor not subjected to fire load, and the ultimate value of the equivalent distributed load applied to the top surface of the floor is up to 35 kN/m2, which may be used as basis of strengthening and repairing of the profiled sheet-lightweight aggregate concrete composite floor after exposure to fire.

DOWMETAL ZK60A

Alloy Digest ◽  
1952 ◽  
Vol 1 (1) ◽  
Keyword(s):  
Fracture Toughness ◽  
Grain Size ◽  
Corrosion Resistance ◽  
High Resistance ◽  
High Strength ◽  
Heat Treating ◽  
Bend Strength ◽  
Chemical Company ◽  
Resistance To Stress ◽  
Extrusion Alloy

Abstract Dowmetal ZK60A is an ageable extrusion alloy for use where high strength magnesium extrusions with good toughness are required. It has small grain size, low notch sensitivity and a relatively high resistance to stress corrosion. This datasheet provides information on composition, physical properties, tensile properties, and compressive, shear, bearing, and bend strength as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Mg-1. Producer or source: The Dow Chemical Company.

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