scholarly journals Kualitas Beton SCC dengan Substitusi Agregat Halus Tailing Tambang Emas Daerah Pongkor

2019 ◽  
Vol 25 (1) ◽  
pp. 59
Author(s):  
Amalia Amalia ◽  
Muhtarom Riyadi
Keyword(s):  
Fresh Concrete ◽  
Setting Time ◽  
Unit Weight ◽  
Fine Aggregate ◽  
Self Compacting Concrete ◽  
Cement Ratio ◽  
Filling Ability ◽  
Passing Ability ◽  
Good Workability ◽  
Lower Tensile Strength

This paper presents the results of self compacting concrete (SCC) with water cement ratio 0.30 with four variations of tailings, ie 0%, 5%, 10% and 15%. Superplastisizer used is a type Naptha 511P of PT.Karya Naptha Belide. The results showed that (1) The use of tailings as fine aggregate in concrete SCC, has good workability. The fresh concrete that uses tailings, passing ability and filling ability is decrease. The use of tailings up to 15% of eligible properties filling ability and passing ability of SCC, (2) The more tailings used in SCC, setting time of concrete becomes longer, (3) Concrete with tailings as fine aggregate have unit weight is smaller than the concrete with fine aggregate sand, (4) Concrete with tailings has higher compressive strength and modulus of elasticity than concrete without tailings, (5)The use of tailings in concrete can lower tensile strength of concrete, (6)The optimum replacement of tailing found to be 10% in the concrete.

Effects of Viscosity Modifying Admixtures on the Workability of Self-Compacting Concrete

2011 ◽  
Vol 306-307 ◽  
pp. 946-950 ◽  
Author(s):  
Bao Guo Ma ◽  
Hui Xian Wang ◽  
Jia Xiao ◽  
Li Xia Li ◽  
Zhi Bin Cheng
Keyword(s):  
Fresh Concrete ◽  
Water Soluble ◽  
Fresh Properties ◽  
Self Compacting Concrete ◽  
Water Soluble Polymers ◽  
Soluble Polymers ◽  
Low Viscosity ◽  
Filling Ability ◽  
Different Types ◽  
Passing Ability

Viscosity modifying admixtures (VMA), known as an important component, are water-soluble polymers that can increase the viscosity and cohesion of self-compacting concrete( SCC). This article presents the effect of four different types of VMA on the workability of SCC , which including flowability, filling ability, passing ability and segregation resistance ability of the fresh concrete. The results show that the low viscosity of VMA satisfies the workability requirement of fresh properties of SCC.

Experimental Study on the Workability of Self-Compacting Granite and Unwashed Gravel Concrete

2017 ◽  
Vol 31 ◽  
pp. 69-76
Author(s):  
Gideon O. Bamigboye ◽  
David O. Olukanni ◽  
Adeola A. Adedeji ◽  
Kayode J. Jolayemi
Keyword(s):  
Experimental Study ◽  
Coarse Aggregate ◽  
Mix Design ◽  
Fine Aggregate ◽  
Self Compacting Concrete ◽  
Consistency Test ◽  
Coarse Aggregates ◽  
Slump Flow ◽  
Filling Ability ◽  
Passing Ability

This study deals mainly with the mix proportions using granite and unwashed gravel as coarse aggregate for self-compacting concrete (SCC) and its workability, by considering the water absorption of unwashed gravel aggregate. Mix proportions for SCC were designed with constant cement and fine aggregate while coarse aggregates content of granite-unwashed gravel combination were varied in the proportion 100%, 90%/10%, 80%/20%, 70%/30%, 60%/40%, 50% /50%, represented by SCC1, SCC2, SCC3, SCC4, SCC5 and SCC6. 100% granite (SCC1) serves as the control. The workability of the samples was quantitatively evaluated by slump flow, T500, L-box, V- funnel and sieve segregation tests. Based on the experimental results, a detailed analysis was conducted. It was found that granite and unwashed gravel with SCC1, SCC2 and SCC3 according to EFNARC (2002) standard have good deformability, fluidity and filling ability, which all passed consistency test. SCC1, SCC2 and SCC3 have good passing ability while all mixes were in the limit prescribed by EFNARC (2002). It can be concluded that the mix design for varying granite-unwashed gravel combination for SCC presented in this study satisfy various requirements for workability hence, this can be adopted for practical concrete structures.

Fresh Properties of Self-Compacting Concrete with Coarse Recycled Aggregate

2012 ◽  
Vol 602-604 ◽  
pp. 938-942 ◽  
Author(s):  
Wai Ching Tang
Keyword(s):  
Coarse Aggregate ◽  
Fresh Concrete ◽  
Cement Content ◽  
Recycled Aggregate ◽  
Test Results ◽  
Fresh Properties ◽  
Self Compacting Concrete ◽  
Coarse Aggregates ◽  
Filling Ability ◽  
Passing Ability

In this paper, the fresh properties of self-compacting concrete (SCC) using recycled coarse aggregate (RCA) were evaluated. Five types of SCC mixtures were made, where the percentage of substitution of natural coarse aggregate by RCA was 0, 25, 50, 75 and 100%. The cement content, water to binder (W/B) ratio and Superplasticizer dosage were kept the same for all mixes. The effects of RCA on the key fresh properties such as filling ability, passing ability, and segregation resistance of SCC were investigated by conducting several fresh concrete tests included slump-flow, L-box, and sieve stability tests. The overall test results suggest that RCA can be used to produce SCC substituting up to 100% natural coarse aggregates without affecting the key fresh properties of concrete.

scholarly journals Experimental Study on the Workability and Stability of Steel Slag Self-Compacting Concrete

2020 ◽  
Vol 10 (4) ◽  
pp. 1291
Author(s):  
Suiwei Pan ◽  
Depeng Chen ◽  
Xiuling Chen ◽  
Genwang Ge ◽  
Danyang Su ◽  
...  
Keyword(s):  
Raw Materials ◽  
Economic Value ◽  
Steel Slag ◽  
Fine Aggregate ◽  
Self Compacting Concrete ◽  
Filling Ability ◽  
Mix Proportion ◽  
Natural Aggregates ◽  
Passing Ability ◽  
Performance Research

There is important application value and economic value in exploring the potential use of steel slag to prepare self-compacting concrete (SCC) and make full use of solid waste resources. In this paper, steel slag self-compacting concrete (SSCC) with relatively ideal workability is prepared by using steel slag instead of natural fine aggregate based on mix proportion optimization and SSCC performance research. The filling ability, passing ability and resistance segregation were tested to evaluate the workability of SSCC. The results show that when the content of steel slag sand is 20%, the workability performance of SSCC is similar to that of SCC with natural aggregates. When the content of steel slag sand is less than 60%, the performance of SSCC can also meet the workability requirements after adjusting the amount of raw materials.

scholarly journals OPTIMIZATION MIX PROPORTION FOR ULTRA HIGH STRENGTH SELF COMPACTING CONCRETE

2010 ◽  
Vol 13 (2) ◽  
pp. 5-15
Author(s):  
Hoang Huy Kim ◽  
Vinh Duc Bui ◽  
Manh Van Tran ◽  
Tri Son Ha
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
High Strength ◽  
Fine Aggregate ◽  
Concrete Composition ◽  
Self Compacting Concrete ◽  
River Sand ◽  
Filling Ability ◽  
Mix Proportion ◽  
Passing Ability

Ultra high strength self compacting concrete (UHSSCC) with high filling ability, passing ability, segregation resistance and ultra high compressive strength have been used in many modern construction project. This paper represents the optimization of concrete composition for ultra high strength self compacting concrete, ỉn this experiment, river sand and crush stone were used as fine aggregate, Dmax of coarse aggregate is 10 mm. The study show that slump flow was 525 mm up to 850 mm and compressive strength was 140 MPa up to 170 MPa.

scholarly journals WORKABILTY AND COMPRESSIVE STRENGTH OF SELF COMPACTING CONCRETE USE SEAWATER AS MIXING WATER

2018 ◽  
Author(s):  
erniati ◽  
muhammad wihardi tjaronge ◽  
Rudy Djamaluddin ◽  
Victor Sampebulu
Keyword(s):  
Compressive Strength ◽  
Sea Water ◽  
Fresh Concrete ◽  
Self Compacting Concrete ◽  
Ongoing Research ◽  
Filling Ability ◽  
Compressive Strength Test ◽  
Passing Ability ◽  
Water Measurement ◽  
Mixing Water

Self-compacting Concrete (SCC) is one of concrete technological innovation which effective and efficient. SCC has properties of high fluidity and so that is able to flow past the reinforcement without any segregation of material and fill the spaces in the mold little or without compaction process. Workability of fresh concrete can be said as SCC if qualified filling ability, passing ability and segregation resistance. The aim of this study was to determine the workability and compressive strength of the SCC using seawater as mixing water. Measurement of workability on fresh concrete used EFNARC standard which includes were slump flow test, V-funnel and L-box. Compressive strength test of concrete used ASTM standard 39 / C 39M – 99. The test conducted at the age of 1, 3, 7, and 28 days. The results showed that the workability of fresh concrete using sea water as mixing water qualified as SCC. Compressive strength of SCC using seawater as mixing water had a high compressive strength at an early age compared with SCC using fresh water. This paper is a part of ongoing research studying about microstructure characteristics and the strength of SCC using sea water.

scholarly journals Studi Mengenai Pengaruh Ukuran Maksimum Agregat Kasar pada Campuran Beton Memadat Mandiri (SCC). (Hal. 62-73)

2019 ◽  
Vol 5 (1) ◽  
pp. 62
Author(s):  
Fitri Yanto Hermansah ◽  
Abinhot Sihotang
Keyword(s):  
Compressive Strength ◽  
Fresh Concrete ◽  
Maximum Size ◽  
Self Compacting Concrete ◽  
Filling Ability ◽  
Modulus Maximum ◽  
Passing Ability ◽  
Test Result ◽  
Fineness Modulus

ABSTRAKBeton memadat mandiri (SCC) adalah beton inovatif yang tidak memerlukan getaran pada saat proses pelaksanaanya. Beton ini diberikan zat tambah berupa superplasticizer pada campurannya agar dapat mengalir. Berdasarkan EFNARC, beton ini harus memenuhi 3 (tiga) kriteria yaitu filling ability, passing ability dan segregation resistance. Oleh karena itu dilakukan penelitian untuk mengetahui sifat beton segar dan beton keras pada campuran beton SCC dengan ukuran agregat kasar maksimum 10 mm dan 20 mm. Kemudian komposisi campuran juga dibedakan berdasarkan modulus kehalusan gabungan agregat yang seragam dan bervariasi. Kuat tekan target pada campuran beton SCC 27 MPa dan 47 MPa.Perancangan campuran beton SCC untuk penelitian ini menggunakan cara SNI yang dimodifikasi dengan metode Dreux. Kadar superplasticizer yang digunakan untuk semua jenis campuran sebesar 1,5% dari berat semen. Hasil pengujian beton SCC menunjukan campuran mempunyai karakteristik yang relatif seragam jika modulus kehalusan agregat campuran mempunyai nilai yang sama.Kata kunci: beton memadat mandiri (SCC), modulus kehalusan, ukuran maksimum agregat, superplasticizer ABSTRACTSelf Compacting Concrete (SCC) is an innovative concrete that doesn’t require vibration during the process. This concrete is added with a superplasticizer in the mixture. Based on EFNARC, this concrete must fulfill 3 (three) conditions, such asfilling ability, passing ability and segregation resistance. Therefore, a study was conducted to determine the characteristic of fresh concrete and hard concrete in SCC mixtures with maximum size of 10-mm and 20-mm coarse agregates. The target compressive strength of SCC mixturesis 27 MPa and 47 MPa. In this study,the design of the SCC mixtures uses the SNI method that modified by the Dreux Method. The superplasticizer content used for all types of SCC mixtures is 1.5% of the weight of cement. The SCC test result shows the mixtures have relatively uniform characteristics if the fineness modulus of aggregate has the same value.Keywords: self-compacting concrete (SCC), fineness modulus, maximum agregate size, superplasticizer

Rice Husk Ash as Fine Aggregate Sustainable Material for Strength Enhancement of Conventional and Self Compacting Concrete

2016 ◽  
Vol 692 ◽  
pp. 94-103
Author(s):  
S.S. Samantaray ◽  
K.C. Panda ◽  
M. Mishra
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Fresh Concrete ◽  
Partial Replacement ◽  
Hardened Concrete ◽  
Fine Aggregate ◽  
Self Compacting Concrete ◽  
Strength Enhancement ◽  
Slump Flow ◽  
Concrete Property

Rice husk ash (RHA) is a by-product of the rice milling industry. Near about 20 million tonnes of RHA is produced annually which creates environmental pollution. Utilization of RHA as a supplementary cementitious material adds sustainability to concrete by reducing CO2 emission of cement production. But, the percentage of utilization of RHA is very less. This paper presents the results of an experimental investigation to study the effects of partial replacement of fine aggregate with RHA on mechanical properties of conventional and self-compacting concrete (SCC). The fine aggregate is replaced by RHA in conventional concrete (CC) with six different percentage by weight such as 0%, 10%, 20%, 30%, 40% and 50% having w/c ratio 0.375 with variation of super plasticiser dose, whereas in SCC the replacement of fine aggregate by RHA is 0%, 10%, 20%, 30%, 40%. The design mix for CC is targeted for M30 grade concrete. The fresh concrete test of SCC is conducted by using slump flow, T500, J-ring, L-box, U-box and V-funnel to know the filling ability, flow ability and passing ability of SCC. As fresh concrete property concerned, the result indicates that the slump flow value satisfied the EFNARC 2005 guidelines upto 30% replacement of fine aggregate with RHA whereas 40% replacement did not satisfy the guideline. As hardened concrete property concerned, the compressive strength, split-tensile strength and flexural strength of CC and SCC are determined at 7, 28 and 90 days. The test result indicates that upto 30% replacement of fine aggregate with RHA enhances the strength in CC whereas the strength enhancement in SCC upto 20% replacement.

scholarly journals Enhancing the Strength Properties of Self-Compacting Concrete with Fiber Reinforcement

2019 ◽  
Vol 6 (5) ◽  
pp. 5-8
Keyword(s):  
Tensile Strength ◽  
Flexural Strength ◽  
Steel Fiber ◽  
Strength Properties ◽  
Self Compacting Concrete ◽  
Split Tensile Strength ◽  
Filling Ability ◽  
Hardened Properties ◽  
Passing Ability ◽  
New Generation

Self-compacting concrete is one that is flow able by its own. The SCC is suitable for placing in dense reinforcement structures. It is a new generation performance concrete known for its outstanding deformity and high resistance to bleeding. The concrete is frail material which is comparatively tough in compression but fragile in tension. The tensile strength of concrete is improved by addition of fibers in the concrete mix. The addition of such fibers has negative consequence on the workability of concrete. Various types of fibers are used in concrete to provide the higher flexural strength and better tensile strength. In this research steel fibers are used to provide a better strength as compared with normal reinforced concrete. Steel fiber in SCC significantly improves its flexural strength, improved tensile properties, reduce cracking and improve durability. In this research the investigation of steel fiber in SCC to enhance the strength properties of SCC. The objective of the study was to determine different properties of SCC with steel fiber at different proportions. The experimental investigation was took on the freshly mixed and hardened properties of SCC of various mix with the different variations of fiber 0.25%, 0.50%, 0.75% and 1% by using Viscosity Modified Agent (VMA) 1.5% of cement material by using M25 grade of concrete. In this research a series of tests were carried out for workability like slump cone test, U funnel, V funnel, L box test on SCC to check freshly mix properties like flow-ability, filling-ability, and passing-ability and hardened properties like compressive strength, split-tensile strength and flexural strength respectively and test were conducted at the age of 7Days, 14Days, 28Days on the SCC. The advantage of adding steel fiber in self-compacting concrete is that it enhances its overall strength.

Preliminary Study on Reaction of Fresh Concrete with Carbon Dioxide

2018 ◽  
Vol 382 ◽  
pp. 230-234
Author(s):  
Ming Ju Lee ◽  
Ming Gin Lee ◽  
Yung Chih Wang ◽  
Yu Min Su ◽  
Jia Lun Deng
Keyword(s):  
Carbon Dioxide ◽  
Compressive Strength ◽  
Fresh Concrete ◽  
Setting Time ◽  
Cement Matrix ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Initial Setting Time ◽  
Initial Setting ◽  
Short Time

In order to let fresh concrete react with carbon dioxide sufficiently, the carbon dioxide was added to mixing concrete. The study used three water cement ratio (0.55, 0.65, 0.75), three CO2 pressures (0.2, 0.4, 0.6 MPa), and two CO2 concentration (50% and 100%) to make concrete samples, and observed the effect of carbon dioxide adsorption in the above parameters. Finally, the compressive strength and carbonation degree of concretes were tested after three curing time (7, 14 and 28 days). The research showed that concrete could be more efficient to absorb carbon dioxide by using this pressure method. The results found that the mixing concrete react with carbon dioxide in a short time, and shorten the initial setting time of concrete. But this method would greatly reduce the workability of concrete after mixing with carbon dioxide and it might be enhanced by water or superplasticizer. The bond of cement matrix might cut down after reacting with carbon dioxide. Based on the above, the compressive strength of concrete which was mixed with carbon dioxide would be impaired. The proposed CO2-mixing method has the capacity to uptake 9.5% carbon dioxide based on water cement ratio and CO2 pressure.

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