The Application of Light Weight Aggregate Using Reservoir Sediments for Concrete Filled Columns

2013 ◽  
Vol 284-287 ◽  
pp. 1379-1384
Author(s):  
Jui Ling Liu ◽  
Dung Myau Lue ◽  
Ping T. Chung
Keyword(s):  
Concrete Strength ◽  
Research Work ◽  
Special Kind ◽  
Light Weight ◽  
Test Results ◽  
Work Related ◽  
Sediment Deposits ◽  
Testing Data ◽  
Light Weight Concrete ◽  
Light Weight Aggregate

In the current 2005 AISC specification, the in-filled light-weight concrete strength (fc´) of concrete-filled tube (CFT) columns is set in the range of 21~ 42 MPa, but with no real substantial testing data to confirm and verify the provisions. Research work related to rectangular column sections with light-weight concrete is rather limited and deserves further investigation. Eighteen rectangular tubes filled with light-weight concrete with fc´ varying from21.4 to43.5 MPa were tested. A special kind of light weight aggregate using find sediment deposits dredged from a local reservoir in Taiwan were used in this experimental study. Formulas for CFT columns as specified in the design code AISC Specification were examined and compared. The test results actually show that the further lower fc´ values are possible and that the 1999 AISC-LRFD provisions yields conservative design results. For the fc´ range specified in the 2005 AISC specification is found to be in good agreement with the test results

scholarly journals Strength Behavior of Pumice Stone Lightweight Concrete Beam in Contrast with Reinforced Concrete Beam

2019 ◽  
Vol 8 (3) ◽  
pp. 297-300
Keyword(s):  
Concrete Beam ◽  
Coarse Aggregate ◽  
Lightweight Concrete ◽  
Reinforced Concrete Beam ◽  
Unit Weight ◽  
Light Weight ◽  
Pumice Stone ◽  
Light Weight Concrete ◽  
Foamed Concrete ◽  
Light Weight Aggregate

The density of concrete less than that of nominal concrete achieved by any means is referred as Light weight concrete. Circulated air through Concrete, Light Weight Aggregate Concrete, Foamed Concrete are different types of Light weight concrete. In this research study, the density of the concrete has been reduced by replacing the coarse aggregate by the pumice stone as light weight coarse aggregate. The major advantage of this study is to reduce the risk of seismic damages of the structure by reducing the self weight of the structure. The decrease in dead load of structure because of the utilization of LWC additionally brings about reduction in the cross segment of other auxiliary individuals such as beam, column and foundation. The pumice stones have huge number of voids and have moderately higher warm protection than the ostensible aggregates. The objective of this research is to obtain light weight concrete having low unit weight and an optimum compressive strength. The Nominal concrete and the light weight concrete is prepared and the tests were led to decide the mechanical properties and compressive quality, its flexural capacity in beams

scholarly journals Study on Behaviour of Cellular Concrete Slab

2018 ◽  
Vol 7 (2.12) ◽  
pp. 420
Author(s):  
Sindhu Nachiar S ◽  
Anandh S ◽  
Jeyem Veerarajan
Keyword(s):  
Concrete Slab ◽  
Single Point ◽  
Void Volume ◽  
Light Weight ◽  
Test Results ◽  
Structural Elements ◽  
Conventional Concrete ◽  
Air Voids ◽  
Construction Techniques ◽  
Light Weight Concrete

Generally for any construction, normal conventional concrete is used to obtain required strength as per design. In the construction industry, now a day’s many construction techniques are in practice to minimise the self weight of concrete, thereby reducing the size of structural elements. One of the most widely adopting techniques is use of light weight concrete. But use of these light weight concrete do not fulfil the strength requirement as per the design of the structure. Hence it is used only as non-load bearing structural elements in the field. In view of this, in this study the attempt has been made to introduce the air voids in conventional concrete without compromising the strength. In this work the air voids are introduced in the concrete slabs and it is tested in the laboratory to know the performance. For this purpose, the slab of the size of 600mm x 600mm x 100mm is prepared with the voids of diameters 30mm, 35mm and 40mm. The voids are introduced in the concrete slab in four different configurations (line, X, I and matrix) to prepare the cellular elements. The normal and cellular slabs are tested under single point loading and the effect of various configurations is studied at the age of 28 days. From the test results, it was found that the slab with void volume of 1.59% shows the lowest stiffness and the slab with void volume of 2.28% shows the highest stiffness.

Experimental Study on the Flexural Tensile Properties of Fiber Reinforced Light-Weight Aggregate Concrete

2013 ◽  
Vol 341-342 ◽  
pp. 1458-1462
Author(s):  
Jian Gang Niu ◽  
Jian Bao ◽  
Yao Zhong Guo
Keyword(s):  
Experimental Study ◽  
Steel Fiber ◽  
Breaking Strength ◽  
Light Weight ◽  
Test Results ◽  
Fiber Reinforced ◽  
Aggregate Concrete ◽  
Tension Properties ◽  
Bonding Properties ◽  
Light Weight Aggregate

In order to investigate the effect of fiber reinforced light-weight aggregate concrete on flexural tension properties, five groups of steel fiber reinforced light-weight aggregate concrete (SFLWAC) specimens with different steel fiber volumes including 0.5%,1.0%,1.5%,2.0%,2.5% and another five groups of plastics-steel fiber reinforced light-weight aggregate concrete (PSFLWAC) specimens with different plastics-steel fiber volumes including 0.5%,0.7%,0.9%,1.1%,1.3% were tested. The test results show that fiber can greatly improve ductility, and there are good interfacial bonding properties between fiber and light-weight aggregate concrete. The test results also show that it is not obvious to the upgrade of the flexural strength of light-weight aggregate concrete of LC30 with plastics-steel fiber. But the addition of steel fiber can gradually improve the breaking strength owing to the increase of steel fiber volumes.

Energy absorption potential of light weight concrete floors

2012 ◽  
Vol 39 (11) ◽  
pp. 1193-1201 ◽  
Author(s):  
Robert M. Korol ◽  
K.S. Sivakumaran
Keyword(s):  
Energy Absorption ◽  
Light Weight ◽  
Test Results ◽  
Floor Slabs ◽  
Absorption Potential ◽  
Light Weight Concrete ◽  
Floor Systems ◽  
Research Findings ◽  
Patch Loading ◽  
Penetration Tests

This paper investigates the energy absorption potential offered by light weight concrete (LWC) floors, perhaps when a building is poised to collapse from some extreme loading event. It is assumed here that the failure of LWC structural floor slabs would likely result in both break-up and pulverization of the concrete. To estimate the extent to which crushing of large portions of floor slab material would absorb energy, a series of concrete penetration tests employing patch loading was undertaken on scaled down model slabs. Six specimens had free (unconfined) edges, while the other four were confined along the edges. The test results, together with research findings obtained from the mining and milling industry, indicate that such floor systems would likely play an important role in absorbing energy during global collapse catastrophes.

scholarly journals Application of Light Expanded Clay Aggregate as Replacement of Coarse Aggregate in Concrete Pavement

2018 ◽  
Vol 7 (4.2) ◽  
pp. 1
Author(s):  
Pavithra A ◽  
Jerosia De Rose D
Keyword(s):  
Coarse Aggregate ◽  
Mineral Admixture ◽  
Maintenance Cost ◽  
Light Weight ◽  
Conventional Concrete ◽  
Coarse Aggregates ◽  
Light Weight Concrete ◽  
Clay Aggregates ◽  
Light Weight Aggregate ◽  
Effect Of Light

The main aim of this project is to develop a light weight concrete (LWC) by replacing the coarse aggregate with light weight expanded clay aggregate. The damage caused in LWC is less significant than conventional concrete and therefore the maintenance cost is also reduced. In order to understand the effect of light weight aggregate in concrete, conventional concrete of strength 30MPa was designed with the density of 2400 kg/m3. Then the natural coarse aggregates were replaced by clay aggregates and light weight concrete mix of density 1800 kg/m3 was designed to meet the desired strength requirement. As the density of the concrete tends to be lowered, the strength of the concrete may also tend to decrease. Hence suitable chemical and mineral admixture is to be incorporated in addition to significant water reduction to meet the strength requirement. Cement content kept constant in both the cases. The details of mechanical properties and durability properties of conventional and light weight concrete are reported in this paper. 

Properties of Light Weight Concrete Containing Crumb Rubber Subjected to High Temperature

2016 ◽  
Vol 718 ◽  
pp. 177-183 ◽  
Author(s):  
Tanapan Kantasiri ◽  
Pornnapa Kasemsiri ◽  
Uraiwan Pongsa ◽  
Salim Hiziroglu
Keyword(s):  
Compressive Strength ◽  
High Temperature ◽  
Strength Loss ◽  
Crumb Rubber ◽  
Unit Weight ◽  
Light Weight ◽  
Cement Ratio ◽  
Light Weight Concrete ◽  
Temperature Exposure ◽  
Light Weight Aggregate

In this study, the compressive strength, unit weight and chemical structure of light weight concrete (LWC) containing crumb rubber after exposure to high temperature are investigated. The crumb rubber was used as light weight aggregate in place of normal aggregate at the content of 3-15 wt% of LWC. For all mixtures, the water/cement ratio and sand/cement ratio were fixed at 0.5 and 0.2, respectively. The experimental results showed that the unit weight of LWC containing crumb rubber decreased with increasing crumb rubber content. The unit weight and compressive strength values are in range of 1566-1761 kg/m3, 12-29 MPa, respectively. The LWCs containing 3-7 wt% and 15 wt% crumb rubber can meet the requirement of ASTM standards for structural light weight concrete and masonry, respectively. After high temperature exposure, the unit weight loss and compressive strength loss were 25% and 75%, respectively. All specimens still complied with the requirement of ASTM standard for masonry.

Shear Behaviour of RC Beams Strengthened with FRP Materials

2012 ◽  
Vol 463-464 ◽  
pp. 249-253
Author(s):  
Jiang Feng Dong ◽  
Dong He ◽  
Shu Cheng Yuan ◽  
Qing Yuan Wang
Keyword(s):  
Concrete Strength ◽  
Research Work ◽  
Shear Behaviour ◽  
Rc Beams ◽  
Test Results ◽  
Shear Strengthening ◽  
Four Point Bending ◽  
Reinforced Polymer ◽  
Externally Bonded ◽  
Glass Frp

This paper reports the results of a research work aimed at examining the use of externally bonded of fiber reinforced polymer (FRP) sheets, consisting of carbon FRP (CFRP) and glass FRP (GFRP), as a strengthening solution to upgrade the shear capacities of reinforced concrete (RC) beams. A total of 7 RC beams were constructed and tested under four-point bending, i.e. two reference beams with different concrete strength and without any FRP sheets, one beam reinforced by GFRP sheets and four beams reinforced by CFRP sheets. Externally bonded FRP shear strengthening was found very effective in upgrading the shear strength of the beams strengthened. The shear strengths of RC beams strengthened were improved greatly by FRP sheets, and the strength gain caused by the FRP sheets was in the range of 31-74%. Test results also show that the more ductile behaviour and higher ultimate strength are obtained for the beams with FRP shear strengthening by using high concrete strength.

scholarly journals Experimental Study on Light Weight Concrete Block with Double Core and Double Mesh Using Granulated Corn COB

2021 ◽  
Vol 9 (12) ◽  
pp. 264-272
Author(s):  
Ananda Selvan
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Agricultural Waste ◽  
Research Work ◽  
Concrete Block ◽  
Expanded Polystyrene ◽  
Unit Weight ◽  
Light Weight ◽  
Corn Cob ◽  
Light Weight Concrete

Abstract: A light weight concrete block using granulated corncob as an aggregate is investigated in this research work. Considering corn cob after removing the corn is said to be agricultural waste. Finding practical uses of this waste for manufacturing concrete block may preserve the environment and also allow green technologies. These concrete blocks are studied in terms of compressive strength, water absorption; density and unit weight were experimentally studied. The results obtained are submitted which shows that corn cob blocks have sufficient material properties for non-structural application in building for construction of partition walls. This is the alternative for blocks in expanded clay, expanded polystyrene, particles of cork, coconut coir etc. In this research a clay brick is compared as a reference block or control block. Nine specimen blocks were prepared in a size of 400mm x 200mm x 100mm and cured for 7 days, 14 days and 28 days and subjected to compressive strength test, water absorption test and density. The results are compared with conventional clay bricks. Corn cob blocks offered a good strength, low density and less water absorption. Keywords: Agricultural waste, compressive strength, durability, granulated corn

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