Effect of Compressive Strength on Grouted Sand Column and Compacted Cylindrical Specimen

Grouting 2017 ◽  
2017 ◽  
Author(s):  
M. Muttharam ◽  
N. Kabilan ◽  
V. Samidurai
Keyword(s):  
Compressive Strength ◽  
Cylindrical Specimen ◽  
Sand Column

scholarly journals The Effect of Clay Pozzolana-Cement-Composite on the Strength Development of a Hydraulic Backfill

2018 ◽  
Vol 18 (1) ◽  
pp. 32-38
Author(s):  
S. N. Eshun ◽  
Solomon Senyo Robert Gidigasu ◽  
S. K. Y. Gawu
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Unconfined Compressive Strength ◽  
Ordinary Portland Cement ◽  
Cement Content ◽  
Cylindrical Specimen ◽  
Cement Composite ◽  
Strength Development ◽  
Increased Risk ◽  
Economic Considerations

The study sought to investigate the potential application of clay pozzolana as a supplement for cement in hydraulic backfill, using classified tailings from AngloGold Ashanti, Obuasi Mine. The percentage of the Portland cement that could be substituted with the clay pozzolana to produce backfill with best strength was determined. 10%, 25%, 30%, 35% and 40% of the ordinary Portland cement were replaced with clay pozzolana and then mixed with tailings and water. The slurry produced was cast into cylindrical specimen of 50mm diameter by 120mm high and tested for compressive strength after curing for 7, 14, 21, 28 and 56 days. The results indicate that, clay pozzolana-cement composite has potential for application in hydraulic back fill production without increased risk to safety and dilution. It was noted that hydraulic backfill with 10%, 25%, 30% and 35% of the ordinary portland cement replaced with clay pozzolana had strengths greater than those obtained for ordinary portland cement alone. Ten percent (10%) pozzolana content gave the maximum strength followed by 25% pozzolana. It is recommended that for safety and economic considerations, the cement content should be replaced by 25% pozzolana in the production of backfills. Keywords: Hydraulic Backfill, Portland Cement, Clay Pozzolana, Unconfined Compressive Strength

scholarly journals Mechanism of Sand Cementation with an Efficient Method of Microbial-Induced Calcite Precipitation

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5631
Author(s):  
Lu Wang ◽  
Shuhua Liu
Keyword(s):  
Compressive Strength ◽  
Calcium Carbonate ◽  
Efficient Method ◽  
Sand Particle ◽  
Carbonate Content ◽  
Calcite Precipitation ◽  
Sand Column ◽  
Cemented Sand ◽  
Initial Ph ◽  
Sand Particles

This paper presents an efficient method of microbial-induced calcite precipitation (MICP) for cementation of sand particles. First, the influence of initial pH value of the culture medium on the growth of bacteria was discussed. Then, the compressive strength and calcium carbonate content of cemented sand columns with different sand particle sizes were measured to indicate the cementation effectiveness. The microstructure of cemented sand columns as well as the mineral composition and distribution of calcium carbonate were characterised by means of scanning electron microscopy-energy dispersive spectrometer (SEM-EDS) and X-ray diffraction (XRD). The results showed that the urease-producing bacteria S. pasteurii can be cultured at the initial pH values of 7–10, while a higher pH (e.g., 11) would hinder its growth and decrease its urease activity. The injection method of MICP with high standing time can cement sand columns effectively. Small average sand particle size of sand columns and high injection cycles can facilitate the gain of compressive strength, while calcium carbonate content of sand column higher than 8% can promote the increase of compressive strength. XRD results indicate that the fine grains generated on the surface of sand particles are calcite. The distribution of calcite on sand particles’ surface is broad and uniform. First, calcite was precipitated on the surface of sand particles, and then a precipitation layer was formed, which would connect sand particles through its high enough thickness and contribute to the development of compressive strength of the whole sand column.

Experiments and Modeling of Failure and Fragmentation of Alumina Cylinders under Uniaxial Compression

2012 ◽  
Vol 13 (1) ◽  
Author(s):  
Yong-Gang Wang ◽  
Jian-Dong Hu ◽  
Feng-Hua Zhou
Keyword(s):  
Experimental Data ◽  
Compressive Strength ◽  
Uniaxial Compression ◽  
High Speed ◽  
Cylindrical Specimen ◽  
Specimen Size ◽  
Fragmentation Model ◽  
High Speed Video ◽  
Axial Splitting

AbstractQuasistatic compressive strength of alumina cylinders was measured using specimen of two sizes. The strength of the material was dependent on the specimen size. High speed video photography showed that the failure of the cylindrical specimen started from axial splitting, and after failure the specimen fragmentized into small pieces. A fragmentation model was proposed for estimating the average sizes of the fragments. The calculated fragment sizes agreed reasonably well with the experimental data. By using Ls-Dyna software, the failure of cylindrical specimen containing pre-existing crack-like flaws had been simulated.

scholarly journals Compressive Strength and Bulk Density of Concrete Hollow Blocks (CHB) with Polypropylene (PP) Pellets as Partial Replacement for Sand

2017 ◽  
Vol 3 (10) ◽  
pp. 821 ◽  
Author(s):  
Jonathan David Lasco ◽  
Marish Madlangbayan ◽  
Marloe Baclayon Sundo
Keyword(s):  
Compressive Strength ◽  
Bulk Density ◽  
Cylindrical Specimen ◽  
Waste Materials ◽  
Partial Replacement ◽  
Density Decrease ◽  
Plastic Wastes ◽  
Hollow Block

Plastics are non-biodegradable and the increasing generation of plastics creates a problem of disposal. One promising approach to address this problem is to find other uses for plastics after they are used. While studies on the incorporation of waste materials in concrete abound, little attention has been given to the incorporation of plastic wastes in concrete. Also, these few studies have focused on cylindrical concrete specimens – none in online published articles, to the authors’ knowledge, has focused on concrete hollow blocks. The present study narrowed that gap by shifting the focus of research from the conventional cylindrical specimen to concrete hollow block. Thus, the main objective of the study was to assess the potential of concrete hollow blocks with PP pellets as partial replacement for sand. Polypropylene (PP), which is a subset of these plastics, were pelletized and incorporated in concrete hollow blocks as partial replacement for sand. Five batches of specimens, each with 0%, 10%, 20%, 30%, 40% PP replacement (by volume) were molded and cured for 28 days. The compressive strength and bulk density of the specimens from these batches were determined and compared. Results showed that, generally, compressive strength and bulk density decrease as percent replacement increases; however, it was observed that the compressive strength of the specimens from batch with 10% PP replacement were higher compared to batches with 0% PP replacement.

scholarly journals Penelitian Beton dengan Penambahan Abu Sekam Padi dan Limbah Keramik sebagai Substitusi Semen

2020 ◽  
Vol 3 (2) ◽  
pp. 275
Author(s):  
Olyndia Febrianita ◽  
Ahmad Ridwan ◽  
Yosef Cahyo Setianto Poernomo
Keyword(s):  
Compressive Strength ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Cylindrical Specimen ◽  
National Standard ◽  
Construction Sector ◽  
Ceramic Waste ◽  
Concrete Mixtures ◽  
Compressive Strength Of Concrete ◽  
Average Compressive Strength

Concrete is a technology that continues to develop in the construction sector. Continues to increase in terms of cost. The need for materials to form concrete requires innovation in the use of concrete mixtures. One of them is using the innovation of rice husk ash and ceramic waste. These ingredients is held in the cement content, namely rice husk ash containing silica and ceramic waste containing alumina. The method used refers to the Indonesian National Standard with a cylindrical specimen measuring 15x30 cm tested at 28 days, and the planned quality is fc '14.5 Mpa. The research objective was to determine the compressive strength and slump value by adding a mixture of rice husk ash 3%, 6%, 9%, 12%, and ceramic waste 3% by weight of cement. The results showed that the slump value decreased with the lowest value of 13.5 cm. the results of the compressive strength of concrete with the addition of rice husk ash and ceramic waste have not achieved the planned quality. The average compressive strength that has the highest value is the addition of 9% rice husk ash with 9% ceramic waste, namely 6.53 Mpa.Beton merupakan salah satu teknologi yang terus berkembang di bidang konstruksi. Terus meningkat dari segi biaya, Kebutuhan bahan untuk membentuk beton membutuhkan inovasi dalam penggunaan campuran beton. Salah satunya dengan inovasi pemanfaatan abu sekam padi dan limbah keramik. Bahan tersebut tertahan di dalam kandungan semen yaitu abu sekam padi yang mengandung silika dan limbah keramik yang mengandung alumina. Metode yang digunakan mengacu pada Standar Nasional Indonesia dengan spesimen silinder berukuran 15x30 cm yang diuji pada 28 hari, dan kualitas yang direncanakan adalah fc '14 .5 Mpa. Tujuan penelitian untuk mengetahui kuat tekan dan nilai slump dengan menambahkan campuran abu sekam padi 3%, 6%, 9%, 12%,   dan   limbah   keramik   3%   dari   berat  semen.   Hasil Penelitian menunjukkan nilai slump mengalami penurunan dengan nilai terendah 13,5cm. Hasil kuat tekan beton dengan penambahan abu sekam padi dan limbah keramik belum mencapai kualitas yang direncanakan. Kuat tekan rata-rata yang memiliki nilai tertinggi adalah penambahan abu sekam 9% dengan limbah keramik 9% yaitu 6,53 Mpa

scholarly journals PENGARUH UKURAN DIAMETER LUBANG DALAM ARAH MEMANJANG TERHADAP KEKUATAN TEKAN BENDA UJI SILINDER BETON

2019 ◽  
Vol 3 (2) ◽  
pp. 31-38
Author(s):  
Helwiyah Zain
Keyword(s):  
Compressive Strength ◽  
Cylindrical Specimen ◽  
Hole Diameter ◽  
Cylindrical Shape ◽  
Hole Size ◽  
Not Given ◽  
Test Results ◽  
Compression Load ◽  
Water Pipeline ◽  
The Aesthetic

Design of buildings should pay attention to aspects; Strength, comfort, economics, and aesthetics. One aspect of the aesthetic that is often seen is the rain water pipeline from the roof to the channel on the ground. In order for this pipe is not be seen from the outside, it can be done by aasembling into thecore of the column so that it looks beautiful. To know the effect of hole in the column, need to do research. The aim of this research is to find out the influence of the variation of the size of the longitudinal aperture in the cylindrical specimen against the compressive strength of the concrete. The number of specimen  were 20 pieces, consisting of 15 pieces of specimens given pipe holes and 5 pieces are not given a hole (intact). Variations of hole size, namely: 2.5 cm, 5 cm and 7.5 cm. Each variation of hole size of specimen 5 pieces. Concrete mixture design is done based on ACI method. The specimens used in this research are cylindrical shape specimens with diameter 15 cm and height 30 cm. Testing of concrete compression done at age 28 days. The test of the specimen is carried out by giving the compression load slowly until the specimen failured. The test results obtained the compressive strength of the specimen without hole = 266.48 kg / cm2;  specimen with hole diameter 2.5 cm = 243,08 kg / cm2; specimen with hole diameter 5 cm = 226,22 kg / cm2; and specimen with hole diameter 7.5 cm = 190,13 kg / cm2. The results of this experiments show that the specimen with diameter of  hole 2.5 cm is 91% of the specimen without hole, the specimen with hole diameter 5 cm is 85% of the specimen without hole; and the specimen with hole diameter 7.5 cm is 71% of the specimen without hole. The results of this experimen show that the larger size of the hole in the column the smaller the compressive strength of the concrete compared to the specimen without holes.

scholarly journals Sifat Mekanis Beton Normal dengan Campuran Tepung Marmer

2018 ◽  
Vol 24 (1) ◽  
pp. 71
Author(s):  
Widodo Kushartomo ◽  
Dewi Permata Sari
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Cylindrical Specimen ◽  
Concrete Mixture ◽  
Beam Specimen ◽  
Test Results ◽  
Normal Concrete ◽  
Split Tensile Strength ◽  
Made In

This study is describe about the mechanical properties of normal concrete by adding of marble flour based on the mixed plan made. The compressive strength of the planned test object fc '20.0 and fc' 30.0 MPa was prepared by using the ACI method. The addition of marble flour in a concrete mixture varies from 0%, 5%, 10%, 15%, 20% and 25% to the weight of the cement used. Concrete test specimens were made in the form of cylinders 15.0 cm in diameter, 30.0 cm in height and made in the form of concrete beams measuring 15.0 cm x 15.0 cm x 75.0 cm, the type of mechanical testing performed in the form of compressive strength tests on cylindrical specimen, split tensile strength test on cylindrical specimen and flexure test on beam specimen. Curing is done by immersion technique at 25ºC and the test is done when the concrete is 28 days old. The test results show that the addition of marble flour to the normal concrete mixture can increase its mechanical properties by 26% for compressive strength, 24% for split tensile strength, and 17% for flexural strength. 

scholarly journals Tinjauan Ulang Mengenai Kadar Maksimum Pipih dan Memanjang Agregat Kasar dalam Campuran Beton Cara SNI. (Hal. 107-115)

2019 ◽  
Vol 5 (2) ◽  
pp. 107
Author(s):  
Decka Chaniago Sukanli ◽  
Priyanto Saelan
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
Cylindrical Specimen ◽  
Maximum Level ◽  
Strength Test ◽  
Concrete Mixture ◽  
Concrete Compressive Strength ◽  
Slump Test ◽  
Coarse Aggregates ◽  
Compressive Strength Test

ABSTRAKDalam campuran beton, agregat kasar memiliki 70% sampai 80% pengaruh terhadap kuat tekan beton. Agregat kasar memiliki bentuk yang berbeda seperti membulat, pipih, dan memanjang tergantung pada sumbernya. Dalam penelitian ini, dilakukan penyelidikan pada kadar maksimum bentuk pipih dan memanjang agregat kasar dalam campuran beton. Pada penelitian kadar bentuk pipih dan memanjang agregat kasar ini menggunakan benda uji silinder dengan ukuran diameter 10 cm dan tinggi 20 cm. Pengujian dilakukan dengan uji slump dan uji kuat tekan beton yang mengacu pada SNI. Slump rencana yang digunakan yaitu (30-60) mm dan (60-180) mm dengan kuat tekan beton rencana yaitu 30 MPa usia 28 hari. Hasil pengujian ini dapat diketahui bahwa kadar pipih dan memanjang agregat kasar melebihi 20% tidak berpengaruh terhadap kuat tekan beton selama kadar pipih dan memanjang agregat kasar tidak melebihi 45% dari total agregat batu pecah.Kata kunci: bentuk pipih dan memanjang, agregat kasar, kuat tekan beton, uji slump ABSTRACTIn concrete mixture, coarse aggregate has 70% to 80% influence on concrete compressive strength. The coarse aggregate have different shape like rounded, angular, flaky and elongated depending on the source. In this study, we investigated the maximum level of flat and elongated coarse aggregate in concrete mixture. In the study of the level of flat and elongated forms coarse aggregates using cylindrical specimen with a diameter of 10 cm and a height of 20 cm. Testing was conducted with slump and concrete compressive strength test which refers to SNI. The slump plan used is (30-60) mm and (60-180) mm with a 30 MPa concrete compressive strength of 28 days. The results of this test can be seen that the flat and elongated of coarse aggregates exceeding 20% does not effect compressive strength of the concrete as long as the flat and elongated of coarse aggregates not exceed at 45% of the total aggregates.Keywords: flat and elongated shape, coarse aggregates, compressive strength, slump test

scholarly journals Investigations on Improving the Compressive Strength of Sand Column with Cement Grout and Chemical Admixture

2021 ◽  
Vol 12 (2) ◽  
pp. 1841-1847
Author(s):  
M. Samuel Thanaraj, Et. al.
Keyword(s):  
Compressive Strength ◽  
Internal Friction ◽  
Water Content ◽  
Soil Improvement ◽  
Cement Grout ◽  
Sand Column ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Angle Of Internal Friction ◽  
Chemical Admixture

Grouting is one of the most commonly adopted technique for soil improvement and strengthening. Adding super plasticizers, accelerators, antifreezes, air entraining agent improves the performance of the cement grout. The performance of the grout while injecting in the sand column mainly depends on its fluidity property.  Keeping it in mind about the water cement ratio, the strength of the sand column is studied in two sets of experiments one by sand column with cement grout only and another set by sand column with cement grout added with super plasticizers by varying the water cement ratios. Strength parameters like angle of internal friction and cohesion were obtained be direct shear test and unconfined compressive strength test on the specimens by varying the water content. An increase of 15.2kPa to 60.33 kPa was observed in the cohesion value for specimens with 10% water content and 13.8 kpa to 47.2kPa cohesion value observed in the specimens with 20% water content. The angle of internal friction was decreased from 360 to 160 for 10% water content whereas 300 to 100 for 20% water content.  A series of experiments were conducted on the sand column grouted with cement and for different water cement ratios as 1.5, 2.0 and 2.5. Another set of experiments were repeated by adding 2%super plasticizer Sulphonated Melamine Formaldehyde (SMF). The experiment results revealed that at lower water cement ratio higher value of compressive strength was observed. It was also observed that the strength increases with curing period. 

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