EXPERIMENT AND MODELING ON RELATIONSHIP BETWEEN COMPRESSIVE STRENGTH AND VOID RATIO OF POROUS CONCRETE

Industrial alkali slag is the discharge waste in the process of alkali production. About one million tons of alkali slag is discharged in China in one year. It is a burden on the environment, whether it is directly stacked or discharged into the sea. If we can realize the use of resources, it is a multi-pronged move, so alkali slag is used to improve solidified marine soft soil in this paper. The test results show that the alkali residue can effectively improve the engineering properties of marine soft soil. Among them, the unconfined compressive strength and compressive modulus are increased by about 10 times, and the void ratio and plasticity index can all reach the level of general clay. It shows that alkali slag has the potential to improve marine soft soil and can be popularized in engineering.

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Formulation and characterization of structural lightweight concrete containing residues of porcelain tile polishing, tire rubber and limestone

Cerâmica ◽

10.1590/0366-69132017633682139 ◽

2017 ◽

Vol 63 (368) ◽

pp. 530-535

Author(s):

Z. L. M. Sampaio ◽

A. E. Martinelli ◽

T. S. Gomes

Keyword(s):

Compressive Strength ◽

Construction Industry ◽

Void Ratio ◽

Lightweight Concrete ◽

Fine Aggregate ◽

Conventional Concrete ◽

Tire Rubber ◽

Increased Strength ◽

Porcelain Tile

Abstract The recent increase in the construction industry has transformed concrete into an ideal choice to recycle a number of residues formerly discarded into the environment. Among various products, porcelain tile polishing, limestone and tire rubber residues are potential candidates to replace the fine aggregate of conventional mixtures. The aim of this study was to investigate the effect of the addition of varying contents of these residues in lightweight concrete where expanded clay replaced gravel. To that end, slump, compressive strength, density, void ratio, porosity and absorption tests were carried out. The densities of all concrete formulations studied were 10% lower to that of lightweight concrete (<1.850 kg/m³). Nevertheless, mixes containing 10 to 15% of combined residues reduced absorption, void ratio and porosity, at least 17% lower compared to conventional concrete. The strength of such formulations reached 27 MPa at 28 days with consistency of 9 to 12 cm, indicating adequate consistency and increased strength. In addition, the combination of low porosity, absorption and voids suggested improved durability.

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Experimental Study on Strength of Pervious Concrete by Using Fine Aggregate

International Journal for Research in Applied Science and Engineering Technology ◽

10.22214/ijraset.2021.39266 ◽

2021 ◽

Vol 9 (12) ◽

pp. 895-897

Author(s):

Atif Jawed

Keyword(s):

Compressive Strength ◽

Void Ratio ◽

Rice Husk Ash ◽

Pervious Concrete ◽

Void Content ◽

Fine Aggregate ◽

Coarse Aggregates ◽

Fine Aggregates ◽

Flow Through ◽

Concrete Matrix

Abstract: Pervious concrete is a special type of concrete, which consists of cement, coarse aggregates, water and if required and other cementations materials. As there are no fine aggregates used in the concrete matrix, the void content is more which allows the water to flow through its bodyThe main aim of this project was to improve the compressive strength characteristics of pervious concrete. But it can be noted that with increase in compressive strength the void ratio decreases. Hence, the improvement of strength should not affect the porosity property because it is the property which serves its purpose. In this investigation work the compressive strength of pervious concrete is increased by a maximum of 18.26% for 28 days when 8% fine aggregates were added to standard pervious concrete Keywords: W/C ratio, pervious Concrete, sugarcane bagasse’s ash, rice husk ash compressive strength, fine aggregates

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Compressive Strength Prediction of Porous Concrete Using Nondestructive Tests

Journal of Civil Engineering and Architecture ◽

10.17265/1934-7359/2011.12.001 ◽

2011 ◽

Vol 5 (12) ◽

Author(s):

Young Sang Cho ◽

Jeom Han Kim ◽

Sung Uk Hong

Keyword(s):

Compressive Strength ◽

Strength Prediction ◽

Porous Concrete ◽

Nondestructive Tests

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Mechanical Properties of Granite-Gravel Porous Concrete

International Journal of Engineering Research in Africa ◽

10.4028/www.scientific.net/jera.57.115 ◽

2021 ◽

Vol 57 ◽

pp. 115-123

Author(s):

Samson Olalekan Odeyemi

Keyword(s):

Compressive Strength ◽

Coarse Aggregate ◽

Optimal Combination ◽

Control Surface ◽

Control Specimen ◽

Cement Ratio ◽

Porous Concrete ◽

Design Expert ◽

Optimal Mix ◽

Percentage Porosity

The need for porous concrete has become increased due its ability to control surface water, increase the rate of recharging groundwater, and reduce pollution of the ecosystem. Granite is a coarse aggregate that is quite expensive when compared with gravel in Nigeria. Therefore, this research is aimed at optimizing blended granite and gravel in the production of porous concrete. Samples of blended granite-gravel porous concrete of varying mix proportions were produced using cement to aggregate mix ratio of 1:4. The samples were tested for their porosity, workability and compressive strengths. The data collected were analyzed with the aid of Design Expert 10.0. It was observed that the optimal combination for the granite-gravel blended porous concrete is 12% granite, 88% gravel, and a water-cement ratio of 0.66%. This combination gave a porous concrete with a compressive strength of 48.4 N/mm2, percentage porosity of 6% and a compacting factor of 0.91. These values when compared to that of the control specimen revealed that the optimal mix gave a porous concrete with higher porosity, higher workability and a better compressive strength.

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Characterization of a cemented sand with the pulse-velocity method

Canadian Geotechnical Journal ◽

10.1139/t06-008 ◽

2006 ◽

Vol 43 (3) ◽

pp. 294-309 ◽

Cited By ~ 25

Author(s):

Zahid Khan ◽

Anwar Majid ◽

Giovanni Cascante ◽

D Jean Hutchinson ◽

Parsa Pezeshkpour

Keyword(s):

Compressive Strength ◽

Water Content ◽

Wave Velocity ◽

Unconfined Compressive Strength ◽

Void Ratio ◽

Cement Content ◽

Pulse Velocity ◽

Initial Water Content ◽

Strain Property ◽

Cemented Sand

The effect of variation in cement content, initial water content, void ratio, and curing time on wave velocity (low-strain property) and unconfined compressive strength (large-strain property) of a cemented sand is examined in this paper. The measured pulse velocity is compared with predictions made using empirical and analytical models, which are mostly based on the published results of resonant column tests. All specimens are made by mixing silica sand and gypsum cement (2.520% by weight) and tested under atmospheric pressure. The wave velocity reaches a maximum at optimum water content, and it is mostly affected by the number of cemented contacts; whereas compressive strength is governed not only by the number of contacts but also by the strength of contacts. Experimental relationships are developed for wave velocity and unconfined compressive strength as functions of cement content and void ratio. Available empirical models underpredict the wave velocity (60% on average), likely because of the effect of microfractures induced by confinement during the testing. Wave velocity is found to be a good indicator of cement content and unconfined compressive strength for the conditions of this study.Key words: wave velocity, low-strain stiffness, cemented sands, elastic moduli, unconfined compressive strength.

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Effects of Aluminum Concentrations on Microstructure and Compressive Strength of Porous Concrete

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.751.563 ◽

2017 ◽

Vol 751 ◽

pp. 563-569

Author(s):

Oratai Jongprateep ◽

Napamas Jaroonvechatam ◽

Supicha Stienkijumpai ◽

Sicha Kaewsuwan ◽

Thanawat Meesak

Keyword(s):

Compressive Strength ◽

Microstructural Analysis ◽

High Water ◽

Chemical Compositions ◽

High Porosity ◽

Sem Images ◽

Porous Concrete ◽

Practical Applications ◽

Aluminium Powder ◽

Aluminium Addition

High porosity in porous concretes contributes to benefits in terms of lightweight, high water permeability, and superior insulation properties in the concretes. Nevertheless, excessive porosity can lead to diminished compressive strength. This study, therefore, aimed at fabricating porous concretes with porosity and compressive strength in the range suitable for practical applications. Since addition of aluminium powder is a well-known technique for porosity production, this study also assessed effects of aluminium addition on properties of porous concretes. Relationships among concentrations of aluminium, porosity, and compressive strength of the specimens were examined. Microstructural analysis from scanning electron microscope (SEM) images and compressive strength testing according to ASTM C109 revealed that the specimens with 0.15 wt% Al demonstrated porosity and compressive strength were in an acceptable range. Additionally, porosity production and specimen strengthening were discussed with respect to chemical compositions.

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