Compressive Strength Of Normal Concrete Research Articles

The Effect of Plastiment-VZ on the Compressive Strength and Flexural Strength of Lightwieght Concrete Using Aluminium Powder

One of the approaches to producing lightweight concrete is by adding the aluminum powder to the cement mixture to create air bubbles in the concrete as such enabling pores to appear in the concrete. Aluminum powder can reduce the weight of lightweight concrete despite its tendency to reduce compressive strength. The compressive strength of concrete can be increased by certain methods, one of which is by the addition of Plastiment-VZ admixture. This study aims to investigate the effect of the use of Plastiment-VZ admixture on the compressive strength and flexural strength of lightweight concrete. The normal concrete compressive strength is designed to the range of 0.7 MPa – 5.0 MPa. The concrete testing specimens were in the form of a cube of 15 cm x 15 cm x 15 cm for the compressive test and beams with dimensions of 15 cm x 15 cm x 60 cm for the flexural test. The test results of the compressive strength obtained for normally aerated concrete (0% of Plastiment-VZ) is 6.31 MPa; and for the variation of 0.2% is 6.52 MPa, for 0.4% is 6.8 MPa, and for 0.6% is 8.04 MPa. The highest increase in strength occurred at 0.6% variation, which is 27.46% above normally aerated concrete. The degrees of flexural strength of the concrete produced from each variation of 0%; Based on the findings, it can be concluded that Plastiment-VZ has a significant effect on increasing the compressive strength and flexural strength of lightweight concrete. The more quantity of Plastiment-VZ is used, the higher the compressive strength and flexural strength are produced; even though, the optimum level for the use of Plastiment-VZ for aerated concrete has not been found.

Pemanfaatan Limbah Serbuk Kayu Sebagai Subtitusi Agregat Halus Pada Beton

Concrete is the most widely used material as the main material in construction. As time progresses, human needs also increase, so in this study, wood waste was used into concrete mix with a normal concrete compressive strength value of 20 MPa using aggregate from the Jeneberang River.
 In this study, using sawdust waste to be utilized in concrete with variations of 0%, 3%, 6% and 9% with the aim of research to find out how the effect of sawdust waste into concrete mix with predetermined variations. The implementation method uses the SNI method by making test objects in the form of cylinders and blocks at the Indonesian Christian University Paul Laboratory. 
 From the results of the research conducted, it was found that the effect of sawdust waste mixed into the concrete mixture showed the value of the compressive strength, tensile strength and flexural strength of the concrete increased by 3% then decreased in variations of 6% and 9% but at the addition of 3% the strength value The compressive strength, tensile strength and flexural strength of concrete decreased compared to normal concrete.

Numerical simulation of influence of coarse aggregate crushing on mechanical properties of concrete under uniaxial compression

Coarse aggregate crushing has a significant impact on concrete deformation and failure characteristics. The coarse aggregate geometries with actual shapes are imported and the mesoscopic model of concrete is established in the discrete element method. The effect of coarse aggregate crushing on the mechanical properties of normal concrete and high-strength concrete during the uniaxial compression test is investigated. The findings reveal that: (1) The coarse aggregate crushing affects the concrete stress–strain curve. Increasing the content of crushable coarse aggregates can reduce the concrete’s peak stress and peak strain. (2) The changing trend of compressive strength of normal concrete and high-strength concrete is different as the percentage of crushable coarse aggregates increases. (3) Normal concrete is more affected by coarse aggregate crushing than high-strength concrete. The compressive strength of normal concrete can be reduced significantly with less crushable coarse aggregates. (4) Coarse aggregate crushing changes the failure mode of concrete. The cracks inside the concrete can extend through the crushable coarse aggregates. In conclusion, it is beneficial to obtain a more realistic deformation failure mode of the concrete by considering the crushing of the coarse aggregate during the uniaxial compression test.

Effects of Substitution of Fine Aggregate with Recycled Asphalt Pavement on Compressive Strength of Normal Concrete

In this research, the compressive strength of concrete utilizing fine recycled asphalt pavement (fine RAP) as fine aggregate substitution for natural sand is investigated at weight percentages of 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100 percent. The compressive strengths of concrete were designed according to ACI 211.1 standard for 18 MPa, 25 MPa, 32 MPa and 40 MPa at 28 days of curing. The compressive strengths of the concrete using fine RAP aggregate in this study were compared to the ones that use the natural aggregate in the same proportions. From the results of the tests, it was found that the compressive strength of concrete using fine RAP is dependent on the amount of Fine RAP used in the mix proportions. Test results also indicated that there is a systematic reduction in the compressive strengths with the increase in the weight percentages of the fine RAP. The relationship between the normalized compressive strength and the weight percentages of the fine RAP were proposed. Finally, a suggested strength reduction factor for the concrete using fine RAP as aggregate was also proposed.

RANCANGAN BETON NORMAL FC’ 19,3 MPA MENGGUNAKAN AGREGAT HALUS DAERAH GRADASI NO.2 DENGAN CAMPURAN VARIASI AGREGAT KASAR

The quality of an aggregate in a concrete mixture is one of the factors that affect the quality of the concrete. Geographically, Payakumbuh City and District 50 cities are passed by several rivers where the river's products are used by the local community as building material. This research uses a quantitative approach, the research method uses experiment. The results of this study found that the average compressive strength of normal fc concrete was 19.3 Mpa at the age of 14 days using coarse aggregate from Halaban river, the compressive strength value was 21.68 Mpa. The average compressive strength of normal concrete using the coarse aggregate mixture of Halaban and Bukik Limbuku river is 20.98 MPa and the average compressive strength of normal concrete using a mixture of coarse aggregate Halaban and Batang Agam river is 20.35 Mpa. The conclusion of this study is that coarse aggregate from Bukik Limbuku and Batang Agam river, although the quality of the gradation not include in the SNI standart, but after mixing the coarse aggregate from Halaban - Limbuku and Halaban - Batang Agam, the compressive strength more than fc. '19.3 Mpa.Keywords: Material, Concrete Quality, Compressive Strength, Gradation.

Pemanfaatan Pelepah Pisang Geda Desa Jejawi Sebagai Bahan Tambah Alternatif Kuat Tekan Beton

In its development, concrete technology has innovated a lot in the use of its materials, such as the utilization of unused material waste. Jejawi is a village area located in OKI Regency and one of the livelihoods of its residents is gardening with the produce of Geda bananas, where after harvesting the banana stems are no longer used and become waste. This study aims to determine the effect of the utilization of Geda banana midrib ash in Jejawi Village as an added material on the quality of concrete. With experimental methods carried out in the laboratory, mixing the concrete material using the SNI quality standard K.225 and then adding variations of Geda Desa Jejawi banana ash which has been burned with an average temperature of 316oC by 2%, 2.5%, and 5%. From the test results, the compressive strength of normal concrete is 225.54 kg/cm2, the compressive strength of the banana ash variation of 2% concrete is 234.76 kg/cm2, the compressive strength of the banana ash variation of 2.5% concrete is 217.19 kg/cm2, and the compressive strength of the 5% banana ash variation of concrete is 203.64 kg/cm2. From the test results, there was an increase in compressive strength in the variation of the addition of 2% banana ash from normal concrete, but it decreased in the 2.5% banana ash variation and decreased again at 5%. So it was concluded that the addition of Geda banana stem ash in Jejawi Village could be used as an additional material for the K 225 concrete mixture at the addition of 2% banana ash

Crack and strength assessment of reinforced concrete cement plant blending silo structure

Cracks have occurred at the slab of a cement plant blending silo structure after the 2004 megathrust earthquake and tsunami in Aceh Province, Indonesia. In order to repair and strengthen the structure, an assessment was conducted to evaluate the crack and remaining strength of the structure. Ultrasonic pulse velocity and hammer test were then performed. The site assessment results showed that the dynamic elastic modulus at the crack section was only 0.39 of that at the uncracked ones. Meanwhile, due to the cracks, the average compressive strength of concrete was reduced from 26 MPa to 11.74 MPa. Static and dynamic analysis of the structure with the current building code showed that the remaining flexural capacity of the structure cannot withstand the applied loads, therefore a strengthening of the structure is needed. The combination of epoxy resin injection and carbon fiber reinforced polymer (CFRP) wrapping was proposed for the retrofitting of the structure.

Cyclic performance of exterior R.C beam-column strengthened with different thicknesses of CFRP sheets

The recent ground motion results indicated that the RC buildings are required to be retrofitted by different strengthening techniques. Nowadays, the external strengthening gain interest since its easy, cost effective and not required redesign of buildings. The CFRP sheets are suitable solution and utilized by a number of researchers. However, the numerical cyclic performance of connection strengthened with different thicknesses of CFRP need to be well investigated. This study assessed the performance of RC exterior beam column connection strengthened with CFRP sheets First, two grades of concrete are utilized to be control specimens, normal concrete compressive strength (C20) and high concrete compressive strength (C50) then, the specimens are retrofitted with different thicknesses (1.2, 2.4, 3.6mm) of CFRP sheets. The stresses and damage states showed the importance of connection retrofitting. The CFRP shift the plastic hinge zone away from the panel zone. Furthermore, the results demonstrated that by increase of CFRP thickness the connection resistance will be improved. The comparison between the hysteresis curves demonstrated that the yield and ultimate loading were enhanced for strengthened connection for both concrete grades and the incremental in thicknesses also increase them. The outputs also exhibited that the stiffness and ductility has increased for retrofitted specimens indicating that the CFRP comprehensively overcome the applied cyclic loading and the beam column connection is able to resist such type of loading.

Pengaruh Limbah Beton sebagai Pengganti Agregat Kasar terhadap Kuat Tekan Beton

Concrete is the main material factor in a construction project field that is often used, because concrete has a high compressive strength value so it is very useful for structural buildings to withstand axial forces or compressive forces on the building itself where the structure can be used. for the long term. However, along with the increase in construction development in Indonesia, it has a negative impact on the environment around the construction site because with the rampant construction of this building it will trigger environmental pollution due to the remaining concrete waste from the construction project. On this basis, it encourages the author to conduct research by utilizing waste concrete as a substitute for coarse aggregate for the compressive strength of concrete, by reusing the concrete waste will increase the life of the material from the waste itself. In this study, the materials used were tested first, such as; cement density, silt content, water content, specific gravity absorption, wear testing and sieve analysis on aggregates. Then for the concrete mixture using concrete waste with variations of 0%, 25%, 50%, 75% and 100% of the total weight of coarse aggregate. In this study, the compressive strength at the age of 21 days with a mixture of 0%, 25%, 50%, 75%, and 100% concrete had a compressive strength of 200.92 kg/cm2, 188.83 kg/cm2, 206, respectively. 96 kg/cm2, 177.50 kg/cm2, and 179.01 kg/cm2. Then experienced an average shrinkage of 9.53 kg/cm2 at the age of 28 days. The optimum compressive strength is at 50% mixed variation, with a value of 206.96 kg/cm2 because it has an increase of 3% higher than normal concrete compressive strength with a mixing ratio of 1:2.5:3.5 and a slump value of ±13.25 cm and the dry weight of the concrete is 7.69 kg.

Testing of Nutmeg Shell as a Normal Concrete Material in Terms of Volume Weight and Compressive Strength Value

Normal concrete uses fine aggregate and coarse aggregate with concrete density 2200 kg/m3-2400 kg/m3 with a compressive strength of about 15-40 MPa [1]. The purpose of this study is to determine characteristics of the concrete aggregate and the compressive strength of the concrete design based on the DOE (Department of Environment) method and the SNI Standard. In this research, the use of nugmet shell was varied as follows: 0%, 0,25%, 0,50%, 0,75% and 1% of the cement weight. The results showed that the use of nutmeg shells as a normal concrete affected the specific gravity and the value compressive strength of concrete. The higher the percentage of nutmeg shells, the lower the specific gravity and compressive strength of the concrete. The average value of density to nutmeg shell concrete (NSC) 2254.72 (kg/m3) and normal concrete 2304.32 (kg/m3). The compressive strength of normal concrete is 224.2 kg/cm2 and the nutmeg shell concrete (NSC) the composition of 0.25% and 0.5% obtained by 129.6 kg/cm2 and 140.0 kg/cm2 increases the use of nutmeg shell 0.75% and 1% obtained value ​​of 117.6 kg/cm2 and 118.1 kg/cm2 decreased at the age of 28 days. The compressive strength of normal concrete 22 MPa while the maximum nutmeg shell concrete (NSC) 14 MPa, so it does not meet the quality of normal concrete in general.

Performance of Recycled Concrete Made from Railway Sleeper: Experimental Study

Concrete railway sleeper has been used in Indonesia since about 1990�s. It has more advantage that is less maintenance, stabile, good quality, shapeable, onsite raw material, and higher loading ability [9-10, 20 - 22]. But It is prone to damage such as cracking and breaking during construction, so it is often thrown away as a solid waste that can contaminate the land and reduce soil fertility. Therefore, it should be utilized in order to be more useful that is used as recycle aggregate. The concrete waste that is taken from broken concrete railway sleeper will be crush as an aggregate as raw material in the concrete to substitute part or all of the normal concrete. It is called recycled aggregate and concrete that is made from recycled aggregate is called recycled concrete. Base on the testing of raw material, the recycled aggregate can be met to the specification as ASTM [1], so it can be used for concrete raw material. Recycled concrete compressive strength result lower the normal concrete compressive strength in the same initial strength design. The strength value of recycled concrete is decrease about 1 � 17% for 25 MPa and 10 � 18% for 30 MPa. It is also happened to tensile strength of recycled concrete that decrease about 2 � 13 % for 25 MPa and 7 � 22 % for 30 MPa.

STUDY OF THE EFFECT OF THE USE OF ADDITIONAL ADDITIVES DAMDEX AND BESTMITTEL ON THE COMPRESSIVE STRENGTH OF CONCRETE f'c 20 MPa.

Under normal circumstances, the maximum strength of the concrete will be reached at the age of 28 days, but to achieve the initial maximum strength of the concrete can be done in 2 ways, namely the use of Portland cement or the use of mineral additives or chemical admixtures. Another purpose of the use of admixture is the fulfillment of a short concrete execution time but the performance of the concrete is maintained.This study aims to determine the comparison of the compressive strength (N/mm2 unit) of normal concrete with concrete that uses Damdex and Bestmittel added materials, the test object used is cylindrical with the percentage addition of Damdex 2% and Bestmittel 0.2% of the weight of cement with composition the mixture used using the Job Mix Formula f'c 20 MPa for the Block B/F Heavy Rehab work project, Kotabaru District Prosperity Market Complex, namely for 1 m3 using 442.00 kg of cement, 681.79 kg of fine aggregate, 1065.72 kg of coarse aggregate , 215 liters of water. With the age of the tested concrete the compressive strength is 14 and 28 days.The results of the normal concrete compressive strength test at 14 and 28 days on average were 20.33 MPa and 22.19 MPa from the design compressive strength (f'c) of 20 MPa. Meanwhile, for the mixture with 2% Damdex and Bestmittel 0.2% added materials at 14 and 28 days the average was 22.93 MPa and 20.76 MPa from the design compressive strength (f'c) 20 MPa..Keywords: Concrete Quality, Damdex, Bestmittel, Compressive Strength

Alternative Using of Fine Aggregate in Concrete with Acid Curing

One of the most widely used construction materials is concrete. Concrete technology is currently developing, one of which is looking for alternative materials concrete forming. This research focuses on the use of slag as a fine aggregate in concrete, especially in environments containing sulfuric and chloride acid. Observations were made by testing compressive strength, indirect tensile strength, and flexural strength, with 171 cylindrical specimens and 27 sample beam specimens. The test results show that the relative percentage of compressive strength of normal concrete on H2SO4 curing against normal curing decreased 1.85% and 2.58% on HCl curing. The biggest reduction in the percentage of concrete compressive strength was found in 30% slag substitution with a value 8.42%, while the percentage reduction in the relative strength of the indirect tensile strength concrete is found in concrete with a slag substitution of 35% with a value 9.26%. As well as the decrease in relative percentage of flexural strength was found in 35% slag substitution with a value 12.84%. Although there is a decrease in each characteristic of concrete, slag material can be used as a constituent for concrete under environmental conditions of sulfuric acid and chloride acid.

The Effect of Curing Methods on Compressive Strength of Concrete

Concrete curing is an effort made to optimize the results of concrete casting. This action needs to be done because it has a major effect on the quality and strength of the concrete, one of which is so that the concrete does not lose moisture too quickly, because later this condition will lead to excessive shrinkage in the concrete. As a result, the concrete can experience cracks. This will cause the construction work to be less qualified and endanger construction users. The purpose of this study is to determine the effect of concrete treatment methods on the value of normal concrete compressive strength. Concrete curing can be carried out by several methods according to the type and condition of the structural elements to be treated. From the results of the study, it was found that the curing method of concrete had an effect on the value of normal concrete compressive strength, namely that the average compressive strength value in the fresh water immersion treatment method was 23.730 MPa, the treatment method for wrapping concrete with gunny sacks was 22.349 MPa, the treatment method of wrapping concrete with plastic is 22.306 MPa, and in the treatment method of pouring concrete with fresh water is 21.199 MPa. The average value of the maximum compressive strength occurred in the treatment method with fresh water immersion, namely 23.73 MPa, and the minimum compressive strength value that occurred was found in the treatment method with fresh water sprinkling, namely 21.199 MPa. Thus, that concrete curing is good, namely, by soaking the concrete with fresh water.

PENGARUH SUBSTITUSI CANGKANG KEMIRI PADA SEBAGIAN AGREGAT HALUS UNTUK BETON K-250 TERHADAP KUAT TEKAN

Concrete is one of the most widely used materials in the construction industry. Concrete building blocks are materials that are widely found in nature, including sand and gravel and cement constituents. Candlenut shell is one of the additives or substitutes for aggregate which has recently been used. began to investigate the impact of its use on the mixture in concrete. The use of candlenut shells can be treated as a substitute for coarse or fine aggregate depending on the size of the pecan shell grains used. and to determine the optimum compressive strength of concrete by mixing candlenut shells as a partial substitute for fine aggregate with a percentage of 0%, 10%, 20%o and 30% of the weight of the fine aggregate. The research method is testing the compressive strength of concrete samples by carrying out laboratory test result. From the results of the concrete experiments that have been carried out and the data that has been obtained with the normal quality of fc 20.75 Mpa concrete and concrete with candlenut shell substitution for coarse aggregate in a mixture of 10%, 20%, and 30%, there are several conclusions, namely the age of concrete is 7, 14.28 days of mixed concrete of 10%, 20%, and 30% of the compressive strength experienced a decrease in the normal concrete compressive strength in every variation of the percentage. The results of the research of normal concrete and candlenut shell mixture on normal concrete 7,14,28 days are 10,74 MPa,13,86 MPa. 14.42 MPa, in 10% candlenut shell mixture 7.14.28 days which is 7.35 MPa. 10.75 MPa. 11.03 MPa, in the mixture of 20%% candlenut shells 7.14.28 days, namely 6.19 MPa, S.48 MPa 9.33 MPa, and in the mixture of 30%% candlenut shells, which is 6.79 MPa. 7,36 MPa, 8,77 Mpa/ Use candlenut shell for partial substitution of fine aggregate in concrete cannot be used as a material as a constituent of concrete.

The Effect of Newspaper Powder on Structural Concrete Pressure Fc ‘21, 7 Mpa

The development of the construction industry in the world will increase the need for concrete as a building material. It will continue to grow as well as the need for further concrete in the future. The Concrete is widely used in construction because it is easily formed according to the needs, especially the concrete-forming materials, namely sand, crushed stone, cement, and water. that materials are not difficult to obtain, maintenance does not require a lot of money, and has high compressive strength. The method used in this research is the experimental method at the Laboratory of the Faculty of Engineering, Universitas Islam Lamongan. In this study, the test object used was a cylindrical specimen with a diameter of 15 cm and a height of 30 cm. The concrete compressive strength test is carried out after the concrete has been immersed for a 7 days treatment period, then a convention is carried out with a correction factor of 28 days. From the results of the normal concrete compressive strength test with 7 days of age converted to 28 days, the average value of 3 samples with a 3% percentage is 18.4 MPa, 5% percentage is 8.6 Mpa, and 10% percentage is 5.8 MPa. From the results of the compressive strength test of paper waste concrete with an age of 7 days converted to 28 days, the composition of 3% is suitable for use. So the 3% percentage of paper waste meets the requirements to be made into fine aggregate in concrete.

The Influence of Rattan Fibre Addition to The Compressive Strength of Normal Concrete

Concrete is high in compressive strength but low in tensile strength and very brittle material. In this study, rattan fibre used as an added material to help eliminate the brittle properties of normal concrete. Variations of fibre used consisted of 0%, 0.5%, 1%, 1.5%, and 2% by weight of cement with mixed planning using the American Concrete Institute method. The compressive strength and stress-strain tests were carried out when the concrete was 28 days old, with a design compressive strength of 25 MPa as many as 15 pieces. The value resulting from testing on normal concrete without the addition of fibres is 24.94 MPa, 0.5% variation of rattan fibres is 23.23 MPa, 1% variation of rattan fibre is 25.3 MPa, 1.5% variation of rattan fibre is 25.85 MPa, 2% variation of rattan fibre is 23.59 MPa. Normal concrete compressive strength test showed an increase in strength at 1.5% rattan fibre and decreased at an additional 2%. The result of stress-strain test in normal concrete without rattan fibre is 0.00125, 0.5% of 0.00254, 1% of 0.00067, 1.5% of 0.00053, 2% of 0.00333. The stress-strain test shows that the addition of rattan fibre can help eliminate the brittle properties that are lacking in normal concrete in general.

ANALISIS PENGARUH PENAMBAHAN AGREGAT LIMBAH PLASTIK (POLYETHYLENE TEREPHATHALATE) TERHADAP KUAT TEKAN BETON

Plastic Material Plastic waste is a problem that is very often encountered in urban and rural areas. The use of plastic in each year will continue to increase because food and beverage products all use materials made of plastic. However, the plastic in question is plastic that is difficult to contaminate with soil or commonly referred to as inorganic waste, which is difficult to self-destruct. This is what causes the amount of plastic waste to increase.Therefore, to reduce this waste, the volume of this waste is used in the development. Besides, the grain gradation of the aggregate has been determined with the aim of obtaining an increase in the compressive strength of the concrete with the addition of plastic waste. The quality of the concrete to be examined by the authors in this study is fc = 14.5 MPa. In other words, in this study the author tries to compare the compressive strength of concrete between normal concrete and concrete mixed with plastic waste. In this study also used a variation of plastic waste substitution with a ratio of 0%, 5%, 10% to the volume of fine aggregate. For each variation, 2 samples were used which included normal concrete so that the total test object used was 12 tested at 7 days, 14 days and 28 days of concrete.From the results of testing the compressive strength of concrete against normal concrete and mixed concrete with sawdust surian at the age of 28 days, the normal concrete compressive strength is 14.5 MPa, while in the sawdust mixture with a percentage of 5%, the concrete compressive strength is 14.14 MPa. 10% obtained a compressive strength of 17.05 MPa. From this test, it can be concluded that from each of the percentages that are made, the compressive strength increases along with the percentage of the amount of plastic waste added to the concrete mixture. In other words, the greater the percentage of plastic waste used, the higher the compressive strength and quality of the concrete produced.

Influence of Dicalcium Silicate and Tricalcium Aluminate Compounds in Different Local Cement Brands on the Compressive Strength of Normal Concrete

The mould-ability of concrete into intricate forms and the versatility of its constituent materials has made concrete to be the most preferred construction material. However, in developing nations such as Nigeria, poor quality of concrete is listed among the common causes of building collapse. Thus, this study investigated the effects of chemical compounds of four commonly used local ordinary Portland cement brands on the compressive strength of normal concrete. The cement was labelled brands A, B, C, and D, respectively, while all the other constituent materials remained constant in this study. The HACH DR 200 direct reading spectrophotometer method was used to analyze the composition of the oxide in each of the cement samples, while the Bogue composition formula was used to estimate the compound compositions of the cement samples. A designed mix proportion of 1:2:4 (cement: sand: granite) at water-cement ratio (w/c) of 0.6 was used to produce the concrete with an expected target strength of 25 N/mm2. Also, the initial and final setting time of the cement samples and the workability of the concrete mixes were determined. Forty-Eight (48) numbers cube samples were cast and tested for compressive strength at 3, 7, 14, and 28 curing days, respectively, using a 150 mm concrete cubes. The result shows the setting time of the cement samples to be within an acceptable period. Also, results indicated that the cement brands have a significant percentage of Tricalcium Silicate (C3S) content and low percentage Dicalcium Silicate (C2S) content responsible for faster hydration rate and higher early strength gain of the concrete. However, it was observed that a higher percentage of Tricalcium aluminate (C3A) leads to higher strength gain from 7 to 28 days of curing age.

Porosity Analysis and Compressive Strength of Normal Concrete with Synthetic Wood Waste Filler Additives

To improve the quality of normal concrete often used additional materials such as fillers, to reduce the cavities in the concrete (porosity). Fillers can fill pores in concrete due to gaps from aggregates, if the empty space is reduced, the compressive strength value of the concrete will increase because the cavities in the concrete can result in cracks during loading. The filler used is synthetic wood waste from PT Dominic NISI which makes multiboard from cement. Synthetic wood fillers are not reactive with water, because the silica content in this filler comes from cement which has been reactive when making synthetic wood, therefore this filler is only as a filler in concrete. The optimal value of porosity testing was 9.774% with variations in the addition of 15% synthetic wood waste filler, has decreased porosity by 7.914% compared to concrete without synthetic wood waste filler. While the optimal value of compressive strength with the addition of synthetic wood waste filler at 10% variation of 41.594 Mpa, an increase of 27.09% compared to concrete without synthetic wood waste filler.