Self-compacting Concrete Concrete Research Articles

Pengaruh Penggunaan Zeolit dan Serat Agave Sisalana Terhadap Kuat Tekan dengan Metode Self Compacting Concrete (SCC)

Self Compacting Concrete (SCC) is concrete innovation which does not require vibrations during installation and compaction. SCC concrete can flow freely with its weight and is capable of filling a mold well, ensuring perfect compaction without vibration. In 1988, in order to eliminate or reduce the need for vibration to achieve density and thereby reduce the labor required for concrete placement, SCC was developed in Japan. In this research, the production of SCC was investigated by replacing the fine aggregate in the SCC mixture by 3%, 7% and 11% of zeolite material and by adding 0.005% of agave sisalana fiber of cement weight. The 15/30 cm concrete cylinders were used in 16 samples for compressive strength. It is shown that the values of flowability, filling capacity, and permeability decrease with increasing use of zeolite content based on the results of the research conducted. The results of the compressive strength test show that the variation of 7% zeolite + 0.005% sisalana fiber has the highest value of compressive strength at FAS 0.43, with an average of 38.46 MPa, and the highest value of compressive strength at FAS 0.45, with an average of 37.07 MPa.

PENGARUH PEMANFAATAN AIR KELAPA SEBAGAI BAHAN SUBSTITUSI CAMPURAN BETON PRACETAK METODE SELF COMPACTING CONCRETE (SCC)

Concrete mixtures are usually made with drinking water or pure water. However, if we are in a difficult condition to get clean water, we must try to use additional materials or waste around us. This is also a difficulty in the construction industry; one of the challenges is how to develop new ideas, such as high-quality and durable concrete (sustainability), from existing materials, such as coconut water. The data collection strategy for this study is laboratory-based. Given that the variables studied in this study include the composition of coconut water used to determine the quality of the concrete mixture, its compressive strength, and its comparison with ordinary water. The compressive strength of self-compacting concrete (SCC) made with 100% coconut water varies. The average compressive strength of SCC concrete with 100% coconut water is 41 kg/cm2 after 3 days, 88.67 kg/cm2 after 7 days, 242.67 kg/cm2 after 14 days, and 364 kg/cm2 after 21 and 28 days. 550.67 kg/cm2. The results of the normal compressive strength test showed growth; the average compressive strength was 284 kg/cm2 at 3 days, 511 kg/cm2 at 7 days, and 1386 kg/cm2 at 14 days. 21 days = 2226; 28 days equals 3098.67.

The Effect of Rice Husk Ash as Cement Substitution on the Compressive Strength of Self-Compacting Concrete

Self-Compacting Concrete (SCC) is an innovative solution in today's world of concrete technology. Unlike traditional concrete, it does not require a vibrator for compaction, which makes concrete work easier. One of the key features of SCC is its high workability, which is achieved through the use of chemical admixtures and mineral additives. Rice husk ash is one such additive that can be used as a pozzolanic material for concrete mixtures, which is important as rice husk waste can cause environmental problems. The objective of this study was to investigate the effect of rice husk ash on SCC concrete. The study involved using Rice Husk Ash (RHA) as a partial replacement for cement in SCC concrete at varying percentages (0%, 5%, 10%, and 15% of cement weight). The results of the slump flow test showed that the highest value of 775 mm was achieved at 15% RHA, meeting the specifications of SCC concrete. In terms of compressive strength, the results showed that the SCC mixture without rice husk ash (0% RHA) had the highest average compressive strength, which was 30.56 MPa at 14 days and 31.66 MPa at 28 days of concrete. On the other hand, the average compressive strength of SCC concrete with rice husk ash mixture was highest at 5% RHA, with 25.04 MPa at 14 days and 28.81 MPa at 28 days. Overall, the study found that the use of rice husk ash in SCC concrete had a significant effect on its compressive strength, with the highest compressive strength being achieved at 5% RHA.

Increasing Compressive Strength of Self Compacting Concrete with MasterGlenium and MasterSure

The growth in development complexity demands innovation in the construction industry. Self-compacting concrete (SCC) can flow and fill mold cavities without additional vibration, offering an efficient solution for structures with complex shapes or tight spaces. In addition, SCC can speed up bonding and simplify workability by adding MasterGlenium and MasterSure superplasticizers. However, its use is limited due to a lack of understanding of the optimal composition of the mixture. The research aims to determine the effect of adding MasterGlenium and Maste Sure in the concrete mixture on the compressive strength of concrete. Experimental research was conducted with a mixture of MasterGlenium additives at 0.25%, 0,30%, 0,35%, 0.40%, and MasterSure 0.30% of the total binder. Slump and compressive strength tests of concrete are carried out to determine workability and quality performance. The research results showed that the optimal concrete mix with the addition of MasterGlenium 0.35% and MasterSure 0.30% was 25.39 Mpa, higher than Normal concrete 15.21 Mpa. The slump test results confirm that the concrete is classified as SCC. This shows the importance of the composition of MasterGlenium and MasterSure superplasticizers on the compressive strength of SCC concrete. So, the results of this research can be used to improve the quality of concrete structure projects.

Analysis of the Resistance of Self-Compacting Concrete (SCC) with the Use of Granite Stone Waste to Alkali-Silica Reaction

Aggregates occupy ±70% of the concrete volume and their quality must meet specifications. Concrete surfaces submerged in water for a long time cause concrete failure due to the reaction between aggregate and cement to form silica gel. The wear value of granite is less than gravel, so this study used granite as a substitute for coarse aggregate. This study was conducted to assess the resistance of SCC concrete with 0%, 25%, and 30% granite stone variations to alkali-silica reaction attack. The experimental method was applied to the study with ACI method mix design as well as 25 MPa plan fc'. Concrete cylinder samples 150 mm x 300 mm aged 28 days were used in the compressive strength test, alkali-silica reaction expansion test used mortar block samples 285 mm x 25 mm x 25 mm in 80±2˚C NaOH solution bath for 14 days. The optimum compressive strength of 32.17 MPa and the lowest percentage change in length of 0.04% was obtained by sample BG.25-SCC, indicating that granite stone is not reactive to silica alkali reaction because the percentage change in length <0.10%. This study concludes that granite stone can improve the resistance of concrete to silica alkali reaction.

Studies on Properties of Sisal Fiber Reinforced Self Compacting Concrete

Abstract: To evaluate the mechanical properties of self-compacting concrete (M30) with sisal fibers. Self-compacting concrete (SCC) mixes are produced by replacing the cement with Fly ash and with addition of sisal fiber of 0, 0.5%, 1% and 1.5% and length of fibers considered are 5mm, 10mm, and 20mm to the SCC concrete. Sulphonated naphthalene Formaldehyde condensates-based SP is used as water reducing agent. Compressive strength of SCC mix has to be determined at 7, 14 and 28 days. Flexural strength of SCC mix has to be determined at 14 and 28 days. Impact strength of SCC mix has to be determined at 28 days.

Microstructure characteristics and evolution of the bonding interface between SCC and steam-cured concrete

The microstructure of the bonding interface in CRTS III ballastless track structures is critical to the mechanical properties and durability of high-speed railway structures. The microstructure evolution of the bonding interfacial zone between steam-cured concrete and SCC (self-compacting concrete) is widely studied. This paper investigates the pore structure and phase evolution of the bonding interface zone using backscattered electronic and energy dispersive spectroscopy (BSE + EDS). Based on the nanoindentation test, the microstructure characteristics of the bonding interfacial zone were studied. The results show that the microstructure reveals a gradient change at the bonding interface zone, and the gradient characteristics of the microstructure weaken as curing age increases (especially at 7 days and 56 days). The width of the bonding interface zone is about 15 μm, and the width is more about 20 μm at 1 day. The elastic modulus of C-S-H at the bonding interface zone is low and the C-S-H is mostly LD C-S-H. VMA is beneficial to improve the elastic modulus of C-S-H.

Multiscale mechanical evolution of the interface between self-compacting concrete and steam-cured concrete

The long-term performance of the bonding interface between self-compacting concrete (SCC) and steam-cured concrete is crucial to the safety and reliability of high-speed railway structures. In this study, During the entire curing cycle, the macroscopic mechanical properties of the bonding interface between SCC and steam-cured concrete were studied. The entire process of interfacial bonding failure at various curing ages was monitored by an acoustic emission test. The failure modes were determined after the splitting tensile test based on 3D laser scanning. The evolution mechanism of mechanical properties was discussed from the perspective of the microstructure of the bonding interface. Results indicate that the time-dependent law of the splitting tensile strength of the bonding interface presented three stages in the investigated curing age (0–90 days). The time-varying law prediction model of the mechanical properties was established based on the time-varying law prediction model of concrete compressive strength. The microhardness of the bonding interface zone presented a significant gradient change at an early age (1–7 days).

Performance of SCC Concrete with Additional Materials of Rice Husk Ash

Concrete with high ductility, workable, high strength, easy to flow without compaction, and durable is a concrete need in the future. Concrete with this quality, one of which is to make self-compacting concrete (SCC). This paper reports performance of self compacting concrete (SCC) containing rice hush ash. Rice husk ash is waste from burning rice husks. The purpose of this study was to determine the performance of SCC concrete with the addition of rice husk ash. SCC specimens were made using rice husk ash (RHA) and SCC without rice husk ash (NRHA). The specimens were made with water cement ratio 0.30. Superplastisizer used is a type Naptha 511P. The result indicated that the workability of SCC containing rice hush ash (RHA) more workable compare SCC without rice hush ash (NRHA). The initial setting time of SCC with rice hush ash more slowly compare SCC without rice hush ash. The compressive strength, flexural strength, and tensile strength of SCC RHA mor higher compare SCC without RHA (NRHA). The tensile strength value of RHA and without RHA concrete meets the tensile strength requirements of RSNI T-12-2004.

Formulasi Beton yang Mengalir Sendiri di Laboratorium Fakulas Teknik Universitas Batanghari

The compaction of concrete is carried out with a vibrating device or using an awl. One solution in facing problems in concrete compaction is to use the Self Compacting Concrete (SCC) method or also called self-flowing concrete. This study aims to obtain a mixture formula / composition of laboratory-scale SCC-making materials that meet the SCC acceptance criteria. The mixing method is carried out by trial and error by referring to the values of Flowability, Workability, and Passing Ability. The planned SCC concrete quality is fc' 35 MPa. The added ingredients used are the superplasticizer Sika Viscoflow 3660 LR dose variations of 1.2%, 1.6% and doses of 2% against the weight of cement and powder. The results showed that the established composition was quite good and met the criteria for acceptance of SCC concrete. The quality of the plan was achieved with the addition of 2% sika viscoflow to fc' 35 MPa.

Characteristics of Self Compacting Concrete (SCC) by the Silica Fume as Portland Cement Substitute

Self-compacting concrete (SCC) is a type of concrete that can flow by itself and can self-compact without using a compactor such as a vibrator. This study aims to observe the effect of cement substitution with silica fume on the compressive strength of concrete. The researchers expect a compressive strength of Self Compacting Concrete up to 500 kg/cm2, although silica fume substituted some portland cement. In order to reduce water use while maintaining the slump flow value of 60±2 cm, a superplasticizer was added at the fixed composition of 1.2% (w/w). The experimental design of silica fume as a cement substitute with a variation of 0%, 5%, 10%, and 15% (w/w). The concrete compressive strength test is carried out under the ASTM C234 standard, while the slump flow value refers to the ASTM C494 standard and the British Standard 5075. Although there was no compressive strength of 500 kg/m2 for all types of cement obtained, it shows that the highest compressive strength of SCC concrete was in the type of OPC cement at 28 days of age.

Analysis of Biaxial Mechanical Properties and Failure Criterion of Self-Compacting Concrete

Biaxial compression-compression, biaxial tension-compression and compression-shear tests were carried out on self-compacting concrete (SCC) using the rock true triaxial machine and compression-shear hydraulic servo machine to explore the biaxial mechanical properties of SCC. The failure modes and stress-strain curves of SCC under different loading conditions were obtained through experiment. Based on the comparison with the biaxial loading test data of ordinary concrete, the following conclusions are drawn: the failure modes and failure mechanisms under biaxial compression-compression and biaxial tension-compression are similar between SCC and ordinary concrete. Under compression-shear loading, the oblique cracks formed on the lateral surface of the specimen parallel to the shear direction gradually increased and the friction marks on the shear failure section were gradually deepened with the increase of axial compression ratio. The development trend of the stress-strain curve in the principal stress direction was not related to the lateral stress. Under the influence of lateral compressive stress, the principal compressive stress of SCC was increased by 55.78% on average; under biaxial tension-compression, the principal tensile stress of SCC had a maximum reduction of 62.79%; and under the compression-shear action, the shear stress of SCC had a maximum increase of 3.35 times. Compared with the biaxial stress test data of ordinary concrete, it can be seen that the lateral compressive stress had a more significant effect on the principal stress of SCC under biaxial loading. Subsequently, the strength criterion equations of SCC under biaxial loading were proposed based on the principal stress space and octahedral space stress respectively, which have shown good applicability in practice.

Applicability of steel slag as replacement aggregate on characteristic of self-compacting concrete

This paper aims to apply steel slag as replacement aggregate on the characteristics of Self-Compacting Concrete (SCC). The experimental study was conducted by mixing fresh SCC using partial substitution of coarse aggregate and fine aggregate slag, which were gained from a steel mill by PT Barawaja in Makassar. Two types of cement binder, such as Portland Composite Cement (PCC) and Silica Fume (SF), were used in the SCC mixture. The mix composition of SCC was designed according to The European Guidelines for Self-Compacting Concrete (EFNARC). The criteria requirements of SCC were evaluated by filling ability, viscosity, and passing ability of fresh concrete with testing by Slump-flow, V-funnel, and L-box apparatus. Specimens of concrete cylinders and concrete prisms were also prepared. After curing in water at 28 days, specimens were tested in compressive strength, flexural strength, and tensile strength according to Indonesian Standard (SNI). The results showed that replacement aggregate of steel slag could be applied in SCC concrete production based on SCC requirements. In addition, test results in compressive strength and flexural strength were obtained 60.70 MPa and 8.61 MPa, respectively.

Self-Compacting Concrete Containing Plastic Bag Waste Fibers Partially Replace by Sand

Abstract: The production of self-compacting concrete SCC is a relatively new technology. Nowadays, the production of SCC is becoming more popular. However, the production of SCC requires more sensitive and efficient workmanship and equipment. This research presents the fresh and hardened properties of self-compacting concrete (SCC) containing plastic bag waste fibers (PBWF). Fibers were prepared by using waste plastic bags. Plastic bag waste fibers (PBWF) are used in varying percentages of fibers (0.5, 1, and 1.5%) replacement by weight of fine aggregate. L-box, U-box, and V-box tests were performed to assess the fresh properties of the prepared mixtures. The compressive strength of the concrete(M-30) was determined. Test results show that mixtures based on PBWF with 0.5%, 1%, and 1.5% met the criteria of self-compactibility (evaluated by U -box, L-box, and V-box) regardless of the fibers content. This research consists of (i) the development of a suitable mix for SCC containing PBWF that would satisfy the requirements of the workability; (ii) casting of concrete samples and testing them for compressive strength for 7days, 14days, and 28days.

Mechanical properties improvement of Self Compacting Concrete (SCC) using polypropylene fiber

SCC (self-compacting concrete) is a type of concrete that can compact itself without the help of external compaction. Thus, it can fill all parts of the formwork that are narrow and have tight reinforcement. A problem that often arises in the use of SCC is the segregation of concrete mixture, which reduces the strength of the concrete. This paper presents the effect of polypropylene fiber on the fresh concrete workability, compressive strength, splitting-tensile strength, and flexural-tensile strength of SCC concrete. The variations of the polypropylene fiber added to the SCC mixture are 0%, 0.05%, 0.067%, 0.1%, and 0.15% of the concrete’s volume, with a water-cement ratio of 0.5 and 0.38 and dense-graded and gap-graded coarse aggregate. Each concrete variation is made into cubes (150x150x150 mm3) for the compressive strength test, cylinders (dia.150mm; height 300mm) for splitting-tensile test, and prisms (100x100x400 mm3) for the flexural-tensile test. The experiments were carried out with concretes with the age of 28 days. The result showed that, polypropylene fiber could reduce the segregation in the SCC concrete mixture. The optimal polypropylene fiber percentage is 0.05%, which could improve the compressive strength by 12.2%, the splitting strength by 17.7%, and flexural strength by 322.3% compared to SCC concrete without polypropylene fiber.

Strength Capacity of Concrete Using Micro Steel Fiber: A Review

Concrete is widely used in the engineering field, particularly in construction. Despite its widespread use in the construction industry, concrete is brittle and has a number of drawbacks, including low tension and crack resistance. As a result, many researchers discovered a way to enhance concrete ductility through adding micro steel fibers (MSF) as a reinforcement. This study explores the impact of MSF on slump height, and the toughness of various concrete. To obtain relevant paper for this research, a systematic literature review was used. When 0.5% to 2% MSF were present in the concrete composite, the result shows a positive increment on its strengths. Meanwhile, the toughness impact of self-compacting concrete (SCC) is reduced depending on what type of water used during the mixing process. Aside from that, adding 0.5% to 2% MSF increases the tensile strength of SCC and ultra-high performance concrete (UHPC). Ultimately, incorporating MSF with concrete to increase the durability is a great idea.

Enhancing Tensile Strength and Porosity of Self Compacting Concrete (SCC) with Glass Waste Powder

Utilization of glass waste powder is an alternative material as a substitute for some cement in SCC concrete because the element contained in the glass waste powder has similarities with cement. Research on glass waste powder as a substitute for some cement using percentage variation that is 5%, 10%, 15%, 20%, 25%, and 30%, with the age of SCC concrete 28 days. The study uses quantitative methods to obtain data on the tensile strength and porosity of the SCC concrete with glass waste powder as a partial substitute for cement. A tensile strength using a cylinder-shaped sample of 150 mm diameter and 300 mm in height with a sample amount per percentage of 4 pieces. The porosity test uses a cylinder-shaped sample of 150 mm in diameter and 300 mm in height with a sample number of each 4 pieces. The results of the study acquired a significant influence of the addition of glass waste powder to strong tensile and porosity of the SCC. Besides, it also obtained the optimal percentage value of the addition of glass waste powder to tensile strength concrete of 5.5% with a maximum value of tensile strength 3.422 MPa. For porosity obtained the optimal percentage value of glass waste powder at 8.583% with a porosity value of at least 9.806%.

Comparison of Material Properties of SCC Concrete with Steel Fibres Related to Ingress of Chlorides

The paper focuses on the evaluation of chloride ion diffusion coefficient of self-compacting concrete with steel fibre reinforcement. The reference concrete from Ordinary Portland Cement (OPC) and Self-Compacting Concrete (SCC) with several values of added steel fibres—0%, 1% and 2% of weight—were cast in order to investigate the effect of fibres. The three procedures of diffusion coefficient calculation are presented—rapid chloride penetration test, accelerated penetration tests with chloride as well as the surface measurement of electrical resistivity using Wenner probe. The resulting diffusion coefficients obtained by all methods are compared and evaluated regarding the basic mechanical properties of concrete mixtures.

The experimental compressive strength of normal and self-compacting concrete with recycled coarse aggregate

Self-Compacting Concrete (SCC) is an innovation in the technology of making concrete that does not require a compaction process to fill the formwork. In this study, recycled coarse aggregate (RCA) was used as constituent material in both normal and SCC concrete. The aggregate was obtained from ready mix concrete waste with the quality of K300-K350, which was crushed into a size of 5-10 mm (25%) and 10-20 mm (75%). Concrete was cast into concrete cylinders, size of 15x30 cm then treated and tested at 28 days. In SCC concrete, superplasticizer is used, but fly ash was not used in the concrete mixture. The compressive test results show that normal concrete has a higher compressive strength than self-compacted concrete. This is due to the high amount of coarse aggregate that used in normal concrete. The results are almost corresponding with modulus of elasticity.

Utilization of Local Fly Ash for Producing Self-Compacting Concrete

Self-compacting concrete (SCC) mixture is an innovation that aimed to ease concrete casting due to its characteristic can be compacted by self-weight without compacting or vibrating. The original SCC mixture which first developed by Okamura contains silica fume (SF) as supplementary material. In this study, fly ash (FA) was used as supplementary cementitious material for SF substitute. The variation of FA used in the mixtures of SCC concrete was 10%, 15%, and 20% by cement weight. For all variations of FA, the results of fresh concrete tests obtained workability that satisfactory to the SCC criteria for the slump flow, V-funnel, and L-shaped box tests. Furthermore, the results of hardened concrete tests achieved the compressive strength ranging from 40 to 46 MPa. These results indicate that local Aceh FA originating from Nagan Raya can be used as supplementary cementitious material to produce SCC with the compressive strength lay in high strength concrete categories.