Porous Concrete Paving Blocks Using Coarse Aggregate

2014 ◽  
Vol 554 ◽  
pp. 111-115 ◽  
Author(s):  
A.H. Nur Hidayah ◽  
Md. Nor Hasanan ◽  
P.J. Ramadhansyah
Keyword(s):  
Laboratory Tests ◽  
Coarse Aggregate ◽  
Skid Resistance ◽  
Fine Aggregate ◽  
Particle Sizes ◽  
Test Results ◽  
Cement Ratio ◽  
Porous Concrete ◽  
Water To Cement Ratio ◽  
Resistance Tests

The objective of the study is to investigate the potential of using Porous Concrete Paving Blocks (PCPB) as a part of paving surface. Laboratory tests were conducted to compare and examine the effect of particle sizes of coarse aggregate. Two coarse aggregate sizes were selected; passing 8 mm retains 5 mm and passing 10 mm retains 8 mm. The fine aggregate was eliminated from mixes. The water to cement ratio used was 0.35. Compressive strength and skid resistance tests were performed to evaluate the properties of PCPB. The test results indicated that there was a reduction in the strength when coarse aggregate at different size was used. Scanning electron microscopy showed that voids, poor bonding and lack of adhesion at the boundaries of the aggregate with cement paste contributing to the low PCPB strength. However, both PCPB specimens provide 30 % to 40 % increase in skid resistance compared to Concrete Paving Blocks (CPB).

scholarly journals Use of Recycled Tyre Rubber in Non-structural Concrete

2018 ◽  
Vol 203 ◽  
pp. 06001
Author(s):  
Muhammad Bilal Waris ◽  
Hussain Najwani ◽  
Khalifa Al-Jabri ◽  
Abdullah Al-Saidy
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Coarse Aggregate ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Structural Concrete ◽  
Cement Ratio ◽  
Mix Proportion ◽  
Water To Cement Ratio ◽  
Concrete Blocks

To manage tyre waste and conserve natural aggregate resource, this research investigates the use of waste tyre rubber as partial replacement of fine aggregates in non-structural concrete. The research used Taguchi method to study the influence of mix proportion, water-to-cement ratio and tyre rubber replacement percentage on concrete. Nine mixes were prepared with mix proportion of 1:2:4, 1:5:4 and 1:2.5:3; water-to-cement ratio of 0.25, 0.35 and 0.40 and rubber to fine aggregate replacement of 20%, 30% and 40%. Compressive strength and water absorption tests were carried out on 100 mm cubes. Compressive strength was directly proportional to the amount of coarse aggregate in the mix. Water-to-cement ratio increased the strength within the range used in the study. Strength was found to be more sensitive to the overall rubber content than the replacement ratio. Seven out of the nine mixes satisfied the minimum strength requirement for concrete blocks set by ASTM. Water absorption and density for all mixes satisfied the limits applicable for concrete blocks. The study indicates that mix proportions with fine to coarse aggregate ratio of less than 1.0 and w/c ratio around 0.40 can be used with tyre rubber replacements of up to 30 % to satisfy requirements for non-structural concrete.

Effect of Coarse Aggregate Sizes on Properties of Porous Concrete Paving Blocks

2014 ◽  
Vol 911 ◽  
pp. 433-437 ◽  
Author(s):  
A.H. Nur Hidayah ◽  
Md Nor Hasanan ◽  
P.J. Ramadhansyah
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Coarse Aggregate ◽  
Aggregate Size ◽  
Skid Resistance ◽  
Fine Aggregate ◽  
Index Test ◽  
Porous Concrete ◽  
Elongation Index ◽  
Flakiness Index

Properties of Porous Concrete Paving Blocks (PCPB) were investigated in this study. Two groups of coarse aggregate sizes were performed; passing 8 mm retains 5 mm and passing 10 mm retains 8 mm. For mixture design, 100 % of coarse aggregate were used. However, fine aggregate was eliminated in this investigation. The density, water absorption, flakiness index and elongation index test were performed to determine the properties of the coarse aggregate used in this study. Compression test and skid resistance test were used to evaluate the performance of PCPB. The results show that PCPB containing coarse aggregate size 5 8 mm give high compressive strength compared to others PCPB specimen. In addition, both PCPB specimens give an in increasing in skid resistance approximately 30 % compared to Concrete Paving Blocks (CPB).

Experimental Study on Sand and Cement Replacement by Termite Mound Soil

2019 ◽  
pp. 279-287
Author(s):  
Harish R ◽  
Ramesh S ◽  
Tharani A ◽  
Mageshkumar P
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Compressive Strength ◽  
Natural Environment ◽  
Fine Aggregate ◽  
Test Results ◽  
Termite Mound ◽  
Cement Concrete ◽  
Cement Ratio ◽  
Compressive Strength Of Concrete

This paper presents the results of an experimental investigation of the compressive strength of concrete cubes containing termite mound soil. The specimens were cast using M20 grade of concrete. Two mix ratios for replacement of sand and cement are of 1:1.7:2.7 and 1:1.5:2.5 (cement: sand: aggregate) with water- cement ratio of 0.45 and varying combination of termite mound soil in equal amount ranging from 30% and 40% replacing fine aggregate (sand) and cement from 10%,15%,20% were used. A total of 27 cubes, 18 cylinders and 6 beams were cast by replacing fine aggregate, specimens were cured in water for 7,14 and 28 days. The test results showed that the compressive strength of the concrete cubes increases with age and decreases with increasing percentage replacement of cement and increases with increasing the replacement of sand with termite mound soil cured in water. The study concluded that termite mound cement concrete is adequate to use for construction purposes in natural environment.

Mechanical Properties of Granite-Gravel Porous Concrete

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.

Effects of water to cement ratio, recycled fine aggregate and air entraining/plasticizer admixture on masonry mortar properties

2020 ◽  
Vol 230 ◽  
pp. 116929 ◽  
Author(s):  
Gloria M. Cuenca-Moyano ◽  
Jaime Martín-Pascual ◽  
María Martín-Morales ◽  
Ignacio Valverde-Palacios ◽  
Montserrat Zamorano
Keyword(s):  
Fine Aggregate ◽  
Cement Ratio ◽  
Recycled Fine Aggregate ◽  
Water To Cement Ratio ◽  
Masonry Mortar

Study on the Influence of Mix Design Parameters on the Properties of Self-Compacting Concrete

2013 ◽  
Vol 857 ◽  
pp. 10-19
Author(s):  
Ji Liang Wang ◽  
Xiang Qian Wen ◽  
Jun Hong Shan ◽  
Ying Liu
Keyword(s):  
Fly Ash ◽  
Volume Content ◽  
Coarse Aggregate ◽  
Mineral Admixture ◽  
Design Parameters ◽  
Fine Aggregate ◽  
Test Results ◽  
Self Compacting Concrete ◽  
Volume Stability ◽  
Dry Shrinkage

the influence of mixing amount of mineral admixture, volume content of fine and coarse aggregate have been systematical studied on the workability, mechanical properties and volume stability of self-compacting concrete. Test results showed that with the fly ash content increased, the workability of self-compacting concrete improved significantly, early compressive strength decreased, but increase rate of later strength improved remarkably, and the mixing amount of fly ash inhibited significantly the dry shrinkage of self-compacting concrete; with the volume content of coarse aggregate increased, the workability of self-compacting concrete decreased significantly, but the volume stability of self-compacting concrete improved obviously, thus the optimum volume content of coarse aggregate of self-compacting concrete was range from 0.30 to 0.34; when the volume content of fine aggregate varied at the range of 0.40~0.50, there may be little effects on the workability of self-compacting concrete, but the increase self-compacting concretes volume content could reduce obviously the dry shrinkage of self-compacting concrete. Moreover, the variation in the volume content of coarse and fine aggregate should have slight influence on the early strength of self-compacting concrete, and the influence of the volume content variety on the later strength of self-compacting concrete could be neglected eventually.

scholarly journals Resistencia de concreto con agregado de alta absorción y baja relación a/c

2012 ◽  
Vol 2 (1) ◽  
pp. 21-28
Author(s):  
R. G. Solís ◽  
E. Moreno ◽  
E. Arjona
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
Construction Site ◽  
Cement Ratio ◽  
Limestone Aggregate ◽  
Concrete Mixtures ◽  
Water To Cement Ratio ◽  
Maximum Compressive Strength ◽  
Crushed Limestone ◽  
High Absorption

RESUMENLa resistencia del concreto depende de la calidad de la pasta de cemento y de las características de los agregados pétreos. La primera es controlada por la relación agua - cemento, mientras que las propiedades de los agregados generalmente no pueden ser manipuladas ya que se suele utilizar aquellos que están disponibles cerca de la construcción. En muchas regiones rocas con propiedades no deseables son utilizadas como agregado. Por lo tanto, el objetivo de este trabajo fue responder a la pregunta sobre cuál sería la máxima resistencia de diseño que se podría utilizar para concretos fabricados con un tipo específico de agregados obtenidos a partir de la trituración de roca caliza de alta absorción. Se probaron concretos con seis relaciones agua - cemento y dos tamaños de agregado grueso. Se concluyó que con los agregados estudiados es posible fabricar concretos de hasta 500 k/cm2 de f’c.Palabras clave: Absorción; agregados calizos; concreto; relación agua/cemento; resistencia.ABSTRACTConcrete strength depends on the cement paste quality and on the characteristics of the aggregates. The former is controlled by the water to cement ratio, while the properties of the aggregate, in general, cannot be manipulated as it is customary to employ the ones available near the construction site. In many regions rocks with no desirable properties are employed as aggregates. Therefore, the aim of this study was to answer the question about what would that be the maximum compressive strength attainable in concrete made with a specific type of aggregate obtained from crushed limestone of high absorption. Concrete mixtures involved six water to cement ratios and two sizes of coarse aggregate. It was concluded that with this type of aggregate it is possible to made concrete with compressive strength up to 500 k/cm2 of f’c.Key words: Absorption; compressive strength; concrete; limestone aggregate; water/cement ratio.

Effect of Using Waste Tyre Rubber on the Properties of Double Layer Rubberized Concrete Paving Blocks

2014 ◽  
Vol 71 (3) ◽  
Author(s):  
Euniza Jusli ◽  
Hasanan Md Nor ◽  
Ramadhansyah Putra Jaya ◽  
Zaiton Haron ◽  
Azman, M
Keyword(s):  
Double Layer ◽  
Coarse Aggregate ◽  
Concrete Block ◽  
Double Layers ◽  
Skid Resistance ◽  
Fine Aggregate ◽  
Rubberized Concrete ◽  
Replacement Level ◽  
Rubber Content ◽  
Waste Tyre

This paper presents a study on the investigation of waste tyre rubber (rubber granule) as aggregate in the production of concrete paving block (CPB) with double layers. A series of tests were carried out to determine the properties of double layer rubberized concrete paving blocks (DL-RCPB). In this study, there are four series of concrete mix with 10 %, 20 %, 30 % and 40 % of waste tyre rubber replacement level. The dimension of CPB was 200 mm x 100 mm x 80 mm with 20 mm thickness of facing layer. The results showed that the percentage of waste tyre rubber content for DL-RCPB affects the density, porosity and compressive strength. The control concrete paving block (CCPB) and DL-RCPB (10 %) achieve the minimum strength requirement of 45 MPa. The density of DL-RCPB (40 %) recorded reduce 24 % as compared to CCPB. At 28 days, the percentage of porosity increased up to 55 % when 40 % of aggregate were replaced with rubber granule. The skid resistance of concrete block increased by 7 % with the incorporation of rubber granule particle size of 1 – 4 mm and 5 – 8 mm up to 40 % as the replacement of fine aggregate and coarse aggregate, respectively.

Orthogonal Design Choices Recycled Concrete Load-Bearing Hollow Block

2013 ◽  
Vol 368-370 ◽  
pp. 1090-1094
Author(s):  
Yuan Xu ◽  
Xiao Ping Wang ◽  
Juan Cheng ◽  
Dong Wang
Keyword(s):  
Compressive Strength ◽  
Water Consumption ◽  
Coarse Aggregate ◽  
Recycled Concrete ◽  
Fine Aggregate ◽  
Replacement Ratio ◽  
Load Bearing ◽  
Cement Ratio ◽  
Recycled Fine Aggregate ◽  
Hollow Block

Study four factors - water consumption , water-cement ratio , recycled fine aggregate replacement ratio of recycled coarse aggregate replacement rate - affect the regularity of the load-bearing hollow block compressive strength of recycled concrete by orthogonal test method , the test showed that , water consumption factors affect the compressive strength of recycled concrete block design with than the emphasis on the control of water consumption . Under the test conditions , the optimum mixture ratio of recycled concrete load-bearing block : water consumption of 160 kg / m 3 , the water cement ratio 0.45 , recycled fine aggregate replacement ratio of 30% recycled coarse aggregate replacement ratio of 30% .

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