Flexural and shear strengths of fiber modify lightweight aggregate concrete and its application in water-retaining structures

2017 ◽  
Vol 14 (2) ◽  
pp. 101-107 ◽  
Author(s):  
Adnan Qadir ◽  
Uneb Gazder
Keyword(s):  
Construction Industry ◽  
Control Sample ◽  
Lightweight Aggregate ◽  
Target Strength ◽  
Lightweight Aggregate Concrete ◽  
Water Tank ◽  
Loading Test ◽  
Retaining Structures ◽  
Aggregate Concrete ◽  
Content Type

Purpose The purpose of this study is to investigate the incorporation of lightweight aggregate concrete modify with fiber (LWACF) in water retaining structure. In developed countries LWACF is being successfully used as structural concrete; however, third-world countries such as Pakistan are still struggling to come up with the practical applications of lightweight concrete in the building and construction industry. One reason is because of the lack of reliable data regarding its performance as a structural member in the building and construction industry. Design/methodology/approach The present study inspected the flexural and shear tolerance of fiber-reinforced LWACF by testing six beam specimens’ cast, cured and tested after 28 days for the purpose. An overhead tank of 1,000-gallon capacity was also constructed to verify the application of LWACF by observing its water retention behavior. The experimental design included a mix design of concrete at a target strength of 21 MPa for control sample natural aggregate and for synthetic aggregate modified with polypropylene fibers. Compressive strengths of both categories of concrete were also determined by crushing the cylindrical samples at the age of 7, 14, 21 and 28 days. The cast beams were later subjected to the application of two-point loading test until failure. Findings It was found that the beams fabricated with LWACF possessed better resistance to cracks compared with those fabricated with normal weight concrete, both in terms of number and crack width. The study also concluded that the constructed water tank with LWACF was thermally efficient and structurally sound, as it showed no sign of seepage for the observed period. Originality/value On the basis of the results, it can be concluded that the LWACF used has revolutionized the concept of using lightweight aggregates in regular structures and that consequently it will help in a constructing a sustainable environment. One of the useful applications of such material is for water-retaining structures.

Evaluation of fire performance of lightweight concrete wall panels using finite element analysis

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Irindu Upasiri ◽  
Chaminda Konthesingha ◽  
Anura Nanayakkara ◽  
Keerthan Poologanathan ◽  
Brabha Nagaratnam ◽  
...  
Keyword(s):  
Finite Element ◽  
Lightweight Concrete ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Fire Performance ◽  
Concrete Wall ◽  
Aggregate Concrete ◽  
Content Type ◽  
Wall Panels ◽  
Foamed Concrete

Purpose In this study, the insulation fire ratings of lightweight foamed concrete, autoclaved aerated concrete and lightweight aggregate concrete were investigated using finite element modelling. Design/methodology/approach Lightweight aggregate concrete containing various aggregate types, i.e. expanded slag, pumice, expanded clay and expanded shale were studied under standard fire and hydro–carbon fire situations using validated finite element models. Results were used to derive empirical equations for determining the insulation fire ratings of lightweight concrete wall panels. Findings It was observed that autoclaved aerated concrete and foamed lightweight concrete have better insulation fire ratings compared with lightweight aggregate concrete. Depending on the insulation fire rating requirement of 15%–30% of material saving could be achieved when lightweight aggregate concrete wall panels are replaced with the autoclaved aerated or foamed concrete wall panels. Lightweight aggregate concrete fire performance depends on the type of lightweight aggregate. Lightweight concrete with pumice aggregate showed better fire performance among the normal lightweight aggregate concretes. Material saving of 9%–14% could be obtained when pumice aggregate is used as the lightweight aggregate material. Hydrocarbon fire has shown aggressive effect during the first two hours of fire exposure; hence, wall panels with lesser thickness were adversely affected. Originality/value Finding of this study could be used to determine the optimum lightweight concrete wall type and the optimum thickness requirement of the wall panels for a required application.

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.

The Analysis of Nano SiO2 Impacting on the Frost Resistance of EPS Lightweight Concrete

2014 ◽  
Vol 1015 ◽  
pp. 60-63
Author(s):  
Jian Cui
Keyword(s):  
Construction Industry ◽  
Frost Resistance ◽  
Economic Benefit ◽  
Lightweight Concrete ◽  
Social Economic ◽  
Lightweight Aggregate ◽  
Economic Benefits ◽  
Lightweight Aggregate Concrete ◽  
Aggregate Concrete ◽  
New Type

Styrofoam (EPS) lightweight concrete, a new type of lightweight aggregate concrete, whose superior thermal performance and remarkable economic benefit earns more and more attention from the engineering. Adding nanoSiO2into it can improve the frost resistance of EPS lightweight concrete, so that it can improve the microstructure and mechanical properties of concrete. The research on the nanomaterials has the vital significance to the frost resistance of EPS lightweight concrete. The wide application of this technology will greatly promote the development of construction industry, and has very important engineering practical value and social economic benefits.

Mechanical performance test and analysis of prestressed lightweight aggregate concrete hollow slab

2019 ◽  
Vol 22 (8) ◽  
pp. 1830-1844 ◽  
Author(s):  
Shiping Li ◽  
Chao Song
Keyword(s):  
Bearing Capacity ◽  
Crack Width ◽  
Performance Test ◽  
Mechanical Performance ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Influence Coefficient ◽  
Test Results ◽  
Loading Test ◽  
Aggregate Concrete

To investigate the mechanical performance of prestressed lightweight aggregate concrete hollow slabs, a symmetric loading test was performed on eight prestressed concrete hollow slabs categorised into four groups based on their variety of coarse aggregate concrete and span, and their respective failure mode, bearing capacity, deformation performance and crack propagation were analysed. Based on the test data, a simulation model was subsequently established to simulate and analyse the test components. The test results showed that the bending process of the prestressed lightweight aggregate concrete hollow slab goes through three stages: elasticity, elasto-plasticity and plasticity. Furthermore, its bearing capacity and failure characteristics are similar to those of a prestressed ordinary concrete hollow slab. Subsequently, we derived a formula for checking the calculation of crack width by introducing a comprehensive influence coefficient of concrete Cm and combining it effectively with the formula in the current code and verified its efficacy. The calculated value of the formula agrees well with the test results, providing a reference for the application of engineering and a supplementary calculation formula for the crack width of lightweight aggregate concrete hollow slabs.

Application of Structural Lightweight Aggregate Concrete in the Pearl River Delta

2011 ◽  
Vol 368-373 ◽  
pp. 3145-3149
Author(s):  
Guo Fei Zhu ◽  
Hong Zhi Cui
Keyword(s):  
Construction Industry ◽  
Pearl River Delta ◽  
Lightweight Aggregate ◽  
River Delta ◽  
Pearl River ◽  
Lightweight Aggregate Concrete ◽  
Engineering Practice ◽  
Aggregate Concrete ◽  
The Pearl River ◽  
Structural Lightweight Aggregate Concrete

In this paper, the research on properties of existing main structural lightweight aggregate (LWA) in the China Pearl River Delta as well as the application of corresponding structural lightweight aggregate concrete (LWAC) were introduced. In the application of structural LWAC, this paper emphasizes the design, manufacturing, construction and economic analysis for application of precast LWAC facade of Hong Kong. As the research deepens, structural LWAC has been gradually accepted by construction industry in Pearl River Delta. Experiment research and engineering practice has proved that the mechanical properties and durability of structural LWAC can completely meet the engineering requirements.

Study on Self-Igniting Gangue Concrete

2010 ◽  
Vol 168-170 ◽  
pp. 2219-2224
Author(s):  
Mei Zhou ◽  
Xiao Fan Zhang ◽  
Feng Jiao Guan ◽  
Zhen Shuang Wang
Keyword(s):  
Sustainable Development ◽  
Portland Cement ◽  
Coarse Aggregate ◽  
Design Method ◽  
Lightweight Aggregate ◽  
Coal Gangue ◽  
Mix Design ◽  
Target Strength ◽  
Lightweight Aggregate Concrete ◽  
Aggregate Concrete

Self-igniting gangue concrete from C15 to C40 was successfully produced with fine and coarse aggregate of coal gangue through mix design method of lightweight aggregate concrete. It concluded that Self-igniting gangue concrete with reasonable grading can reach to the target strength. The basic properties of Self-igniting gangue concrete between Coal Gangue Portland cement and Portland cement were investigated, and mechanism was analysis. The coal gangue content was from 705 to 80% in the concrete. The technology can not only relief the scarcity of natural aggregate, but also employed the solid waste, and it was suitable for sustainable development in 21 century.

Sign in / Sign up

Export Citation Format

Share Document