Behavior Of Self Research Articles

Behavior of self- compacting concrete incorporating calcined pyrophyllite as supplementary cementitious material

The current trend of industrial concrete leans more towards the use of self-compacting concrete. These must have fresh properties well defined as fluidity, filling ability and resistance to segregation. However, to ensure the rheological stability, use mineral fines is required. In this work, powder of calcined pyrophyllite (CP) was used as cement substitution at level of 10% and 20% by weight. The interest is focused on the role played by the calcined pyrophyllite to produce SCC with reduced impact environmental.. Calcination of pyrophyllite powder was carried out at 750 °C. Its effect on the workability and mechanical properties of self-compacting concrete is analyzed. The results show that the properties of workability of SCC containing 10% of calcined pyrophyllite tested at fresh state (Slump Flow, T50, passing ability and segregation resistance) are almost identical to those of the control SCC. Furthermore, the calcined pyrophyllite increases the compressive strength, tensile and flexural strength of SCC approaching without exceeding those of the control SCC. It seems that 10 % of calcined pyrophyllite is the optimum replacement rate which improves mechanical strength compared to 20%. Replacing cement with the calcined pyrophyllite aims to save cement and reduce the CO2 emissions released during the manufacture of cement.

Influence of Loading Pattern Regime on Behavior of Self Compacting Concrete Voided Slab Strips under Repeated Load

This study presents an experimental approach to investigate the structural behavior of normal and moderately high strength Self Compacted Concrete (SCC) voided slab strips under repeated loading system. The experiments were carried out on eight one-way simply supported slabs. Four of them have been tested under two types of repeated loading regime. The required number of cycles of the first load pattern (R1) to achieve permanent damage in the slab is more than 40 cycles, while the second type of repeated loading regime (R2) requires more than 20 cycles to achieve complete damage in the slab for the selected loading scheme. The remaining four additional slabs were tested under monotonically increasing loads. The loading techniques have been applied under the displacement control scheme. The experimental results show that for moderately thick reinforced SCC one way slab having (3 voids, dia. =75mm) under repeated load R1, the ultimate load is reduced by about 10% relative to the reference solid. In this research, the number of cycles required to achieve permanent damage is decreased by about 7% and the mid-span deflection at ultimate load is increased by about 3.4% relative to the reference solid slab. The ultimate load for slab having (3 voids, dia. =75mm) under repeated load R2 is decreased by about 6%, the deflection at ultimate load and the number of cycles are decreased by about 6.1%and 16.7% respectively concerning SCC reference solid slab.

Mechanical behaviour of self compacting concrete with hybrid fibres

Research lag on the stainless steel scrap (lathe waste) on the mechanical behaviour of self-compacting concrete was inferred. It is proposed to investigate the mechanical and flexural behaviour of self-compacting concrete completely under IS-10262:2019 (chapter 7: SCC). Here the effective utilization of materials namely steel fibre and lathe waste as an additive, cement is to be partially replaced with Ground Granulated Blast Furnace Slag (GGBS) along with High Range Water Reducers (ether-based superplasticizer) are to be compared with the control specimen of SCC. Adding fibre content to the volume of concrete by replacing 0%, 0.5%, 1.0%, 1.5% and 2.0% of steel fibre and constant replacing of 0.125% of stainless steel scrap with steel fibre and proceeds as a hybrid combination in SCC.

Flexural Behavior of Self Compacting Concrete T-Beams Reinforced with AFRP

In This paper, an experimental work is carried out to study behavior and performance of Self compacted concrete (SCC) T-section beams reinforced with Aramid fiber reinforced polymers (AFRP) bar. Key variables that taken into consideration were flexural reinforcement ratio, different self-compacted concrete mixes having different strengths. Normal strength steel bars for data comparison. 9 samples of T-sections were designed using (AFRP) to be weak in flexure. 3 samples of T-sections were used with normal steel bars as control samples for comparison. The effect of these fiber reinforcement contents on flexural behavior and crack pattern were observed during third-point loading tests. A data comparison was performed between experimental and analytical beam calculation using ACI 440 as an applied design source. The results show that the final deflection was more in AFRP compared with steel reinforced beams indicating to significant enhancement in strength and toughness. The ultimate capacity of AFRP beams increased more than steel reinforced beams by increasing self-compacting concrete strength. The reinforcement ratio improves the final resisting load as the ratio increases. The maximum observed crack-width in beams reinforced with AFRP bars is three to five times that of normal steel reinforced beams. The exactness of the data depends on both the compressive strength and reinforcement ratio for both AFRP and conventional steel bars. It is seen from data comparison between the experimental work and the ACI 440, That the ACI440 is more conservative when AFRP is used in SCC.

Behavior of Self Compacting Reinforced Concrete One Way Bubble Deck Slab

Reinforced concrete slab with plastic voids (Bubbled Deck system) is a new type of slabs which has two-dimensional arrangement of voids within the slab that is developed to decrease the slab self-weight while maintaining approximately the same load carrying capacity as compared with the solid slabs. Plastic voided slabs have the ability to reduce concrete amount by about 30 percent and this reduction is so important in terms of cost saving and enhancement the structural performance. In this research paper investigation is carried out to study the shear strength behavior of one-way bubble deck slab using self-compacting reinforced concrete. The experimental program consists of testing thirteen one-way slabs with dimensions of (1700 length, 700 width and 150 thick) mm. One of the tested slabs is a solid slab (without balls) is used as a reference, the remaining twelve bubbled slabs with ball diameter (73, 60) mm are divided into five groups according to the parameters of the experimental work, the parameters of the experimental work include: type of slab (bubble and solid slabs), ball diameter (73, 60) mm, shear reinforcement and spacing between balls. The experimental results showed that the bubbled slabs without shear reinforcement have a decrease in the ultimate load as compared to solid slab by about 3.7% to 14.3% and an increase in the deflection at ultimate load by about 10% to 22%, at the same time the first crack load decreases by about 15.3% to 42.4% as compared to solid slab due to decreases of moment of inertia of bubble slab compared to solid slab. Also, the results showed that the bubbled slabs withe shear reinforcement (multi-leg) have an increase in the ultimate load as compared to solid slab by about 35.4% to 57.3% and an increase in the deflection at ultimate load by about 1% to 15%, at the same time the first crack load decreases by about 2.8% to 27.4% as compared to solid slab.

Experimental studies on flexural behaviour of self compact concrete beam

Self-compacting concrete is a liquid flow for pouring in structures with clogged support without vibration. Self-compacting solid improvement must guarantee a decent harmony among deformability and steadiness. Self-compacting concrete (SCC) is a creative solid that doesn't require vibration for setting and compaction. It can stream under its own weight, totally filling formwork and accomplishing full compaction, even within the sight of clogged fortification. The solidified cement is thick, homogeneous and has indistinguishable building properties and strength from customary vibrated concrete. So to addition to this new technique. I have aimed at creating a more cost effective SCC by partial replacement of aggregates with powdered coconut husk, burned coconut husk, powdered coconut shell and burned coconut shell. Thus increasing strength and also decreasing the cost of production. I had tried differently with coconut husk powder as the filler material instead of conventional fly ash. Because coconut husk is 100% natural and renewable resource, easily available. Moreover it is a non-degradable and also it reduces fungus growth. So considering its characteristics had chosen the coconut husk. Therefore this concrete will be economical than that of the conventional concrete. Our concrete grade is M50 in this I adding the two types of admixtures. Conplast sp430 used as a strengthening agent and Glenium B233 used as viscosity modification agent. Finally our motive is to check out the flexural behavior of self compacting concrete beam of 1 m × 0.23 m × 0.23 m having 2 nos of 8 mm bar in both the compression and in tension zone with 6 mm dia vertical stirrups at 150 mm c/c in single and two point load test.

Flexural, Tensile and Compressibility Behavior of Self Compacting Concrete by using Glass Fibers

Fiber Reinforced Self Compacting Concrete” (FRSCC) is composed of cement, different sizes of coarse and fine aggregates, which integrate with fiber. In this current investigation, M40 grade Self Compacting Concrete reinforced with glass fibers has been developed using the Nan Su method. Fresh state and hardened state properties of Glass Fiber Reinforced Self Compaction Concrete are studied for glass fibers of different aspect ratio (875, 1285 & 1714) and percentage of volume fraction (0, 0.25, 0.5, 0.75 & 1). From the investigation carried out it is found that incorporation of glass fibers of aspect ratio 1285 and percentage of volume fraction 0.5 to SCC attains better compressive and flexural strength compared to other mixtures and also incorporation of glass fibers of aspect ratio 1285 and percentage of volume fraction 0.75 to SCC attains better split tensile strength compared to other mixtures.

Structural Behaviour of Self Healed RC Beam by Endolithic Bacteria and Calcium Carbonate

From the olden days the major problem facing by each element like beams, columns, slabs, walls in the structures is cracking. In Civil engineering it is a great challenge to get rid of these problems and applying innovative and cost-effective methods for both curing and strengthening of concrete. In present day days there are various techniques applied in development field itself about fortifying of cement and for fix of breaks in concrete. One approach to get around expensive manual support and fix is to fuse a self-ruling self-mending system in concrete. One such an elective fix system has been presently being examined, for example a novel method dependent on the application in biominerilization of microbes in concrete. From this exploration, utilizing microorganisms and calcium carbonate by 5, 10, 15, 20 rates in 3D shapes and improved an incentive for RC pillars are utilized for the data about expanding the quality and the all out toughness of the solid utilized in the present day will be assembled.

A review on flexural behaviour of self compacting concrete by the addition of M-sand

Abstract Self-Compacting concrete (SCC) is a high – performance concrete that can flow under its own weight to completely fill the form work and self-consolidates without any mechanical vibration. Many research had been done in investigating the auxiliary execution of fiber reinforced self compacting concrete because of the improved building and mechanical properties. The consolidation of steel filaments in the blend has been found to improve the solidified properties of self-compacting concrete as far as its elasticity, malleability, durability, vitality assimilation limit and just as break sturdiness. The goal of this paper is to survey the work done by past scientists on the exhibition of fiber reinforced self compacting concrete in piece structures. The information could be utilized as a guide in growing the utilization of self compacting concrete as the fundamental material in the development of construction components.

Research on Self Compacting Concrete: A Futuristic Concrete

Concrete is most widely used in the construction industry and now-a-days Self compaction concrete is used because of its easy flow able properties and reduction in construction time. Self compacting concrete (SSC) is a basic type of concrete that does not required any kind of compaction or vibration. SCC was first developed by Okamura in Japan during the year 1980. This type of concrete flows easily around the reinforcement and into all corners of formwork and also it saves time, labor and energy. Different admixtures are used to produce effective self compacting concrete (SCC). The workability characteristics of SCC will be evaluated by the following tests like Slump Flow, V- Funnel, L-box Test. Many researches were carried out around the world with regards to different applications on properties and mix proportions. This paper includes the literature reviews related to behavior of self compacting concrete also deals with the strength and behavior of self compacting concrete using fibrous materials and mineral admixtures.

The study of properties and behavior of self compacting concrete containing Electric Arc Furnace Slag (EAFS) as aggregate

Electric Arc Furnace Slag (EAFS) can be efficiently reused as aggregate in the production of high-volume batches of hydraulic concrete mixes that show interesting properties in both the fresh and the hardened state. Mixtures containing EAFS aggregate in proportions of nearly 50% by volume are prepared for use as pumpable and self-compacting mixes with consistency classes of S4 and SF2, respectively. Characterization of the mixtures is presented, examining practical aspects such as thixotropy, segregation in the fresh state (under 6%), and mechanical and microstructural evolution in the hardened state. The results yielded compressive strengths of approximately 60 MPa and elastic moduli of 38 GPa after one year. Finally, real-scale flexural elements are cast and subjected to sustained loading tests of moderate intensity. Long-term deflection values were approximately 50% (pumpable mixes) and less than 40% (self-compacting mixes) of the maximum admissible values specified in current standards.

Behavior of Self Curing Concrete with Recycled Coarse Aggregate

Behavior of Self Curing Concrete with Recycled Coarse Aggregate

Behaviour of Self Compacting Concrete Columns with Recycled Brick Aggregates

Recycled brick aggregates are preferable alternatives to natural aggregates for minimizing exploitation of natural resources. In this investigation, experimental and analytical works are performed to investigate the behaviour of SCC columns constructed using partial replacement of natural aggregates by RBA and reinforced with steel fibres. The parameters considered for this study is proportion of RBA in SCC mixture and the amount of fibres used. The results of this study reveal that the use of RBA in the place of natural aggregates slightly reduces the strength properties, but this reduction compensated by adding mineral admixtures and steel fibres. The analytical results agreed with the experimental results for SCC columns behaviour.

Mechanical Behaviour of Self Compacting Concrete by using M-sand & Rice Husk ash

Rice husk ash (RHA) is an agricultural based pozzolanic material, which contains high amount of silica content. This experimental research was conducted on Self Compaction Concrete (SCC), to generate an economical concrete by using Manufactured Sand (M-sand) and Rice Husk Ash. Natural River sand usage is damaging the river beds, causing the drastic changes in ground water table and cost of river sand increasing day by day. To overcome this problems manufactured sand is used in SCC production. Rice husk Ash is very cheaper when compared to the Cement. It is extracted from Rice Husk which is a waste of Agricultural product. This material can be useful to generate a sustainable construction material. This paper presents the experimental results on development of mechanical properties of SCC with M-sand and Rice Husk Ash. Experiment conducted on 6 different mixes. i.e Partial Replacement with RHA (0%, 5%, 10%, 15%, 20%, 25%). For each mix Fresh properties (Slump flow & L-Box Test) & mechanical properties (Compressive strength, Split Tensile strength and Flexural strength) for 7days, 28days and 60days along with Density comparisons are compared.

Flexural Behaviour of Self Compacting Concrete Beams Modified using Recycled Concrete Waste Aggregates

This study presents an investigation on the flexural behaviour of normally vibrated concrete and self-compacting concrete beams subjected to loading tests. Seven specimens were cast to investigate the flexural behaviour. This experimental analysis mainly varied the parameters such as (1) Percentage of coarse aggregate replacement (RCWA), and (2) percentage of Steel fibres. Results are exhibited in terms of flexural strength, stiffness, failure modes, and deflection curves. The test results revealed that RCWA could be successfully used in SCC. The flexural behaviour of beam decreased with the addition of RCWA. However, the addition of RCWA in combination with SF in SCC significantly improved the overall flexural behaviour. Finite element model also developed to study the behaviour of beams produced by SCC with RCWA content.

Joint Behavior of Self Compacting Concrete using Recycled Concrete Aggregate and Hybrid Steel Fibers

The beam column joint failure normally occurs due to the natural disaster like a strong earthquake, which leads to the collapse of buildings. A huge number of experimental studies have been conducted on beam-column joints made up of SCC using Natural aggregates. Only a few numbers of studies have been done on SCC (Self Compacting Concrete) made up of Recycled Concrete Aggregate (RCA). So, there is a necessity arises to conduct the experiments on beam-column joints produced with SCC using Recycled Concrete Aggregate (RCA). This paper presents behaviour of beam-column joint made up of SCC with RCA. A series of ten beam-column joints with three interior joints and two exterior joints were subjected to loading test, and the results were obtained in terms of load carrying capacity, ultimate load at failure and deformation curves. The obtained results gave experimental evidence of the applicability of RCA in SCC beam-column joints.

Properties of self compacting concrete exposed to wetting and drying cycles in oil products

Although the early deterioration of concrete exposed to petroleum products has being observed yet, the behavior of Self Compacting Concrete (SCC) being exposure to oil products is still unknown. In the present investigation, the mechanical and physical properties of hardened SCC cyclically being exposed to oil products (crude oil, gas oil, motor oil and fuel oil) have tested and discussed. The numbers of exposure cycles are 2, 3, 4, 5 and 6. Each exposure cycle consists of twenty days immersion in water or different oil products followed by air drying at ambient temperature for a period of ten days. The results have been compared to other specimens cured in water or continuously exposed to oil products for the same period. The results show that the effect of continuous exposure to oil products on the mechanical properties is more severe than that of cyclic exposure of SCC specimens. The compressive strength, splitting tensile strength, modulus of rupture, and static modulus of elasticity of SCC specimens have slightly deteriorated until the fifth cycle of exposure for all types of oil products comparing to reference specimens (cured in water). Eventually at the sixth cycle all properties have decreased.

Structural behavior of self – drilling screws applied in steel structures of prefabricated buildings

Since the fast development of prefabricated building industry facilitate the light thin – walled steel application in both low residential building and fast construction, better understanding of the labour intensive fabrication of connection indicates the problems of optimized connection design and reduced manufacturing cost can be addressed. Several parameters such as number of screws and configurations of the screw layout were varied to study the impact on shear strength. Since the connection strength governs the structural behavior of the truss system which is the main part of modern thin – walled steel structure, the connection strength is calculated according to the American Iron and Steel Institute (AISI), Euro code, and Chinese specification respectively. The main failure mode occurred in self – drilling screw connections are found to be the tilting and bearing failure based on 84 single lap shear test. All testing specimens have experience four stages. When the spacing is fixed to certain number and the screw is less than six, the effect of configuration patter on the resistance capacity is very limited. In contrast, if the screw number is more than six, certain patter layout could lead to better overall strength compare with normal layout patter and the group effect factor is becoming as a constant. The strength of connection can be increased by enlarging the screw spacing with certain range.

Flow Behavior of Self Consolidating Concrete Mixes with Various Maximum Size Aggregates

The paper investigates the effects of aggregate size and supplementary cementitious materials (SCMs) on flow behavior of self-consolidating concrete (SCC). The fresh performance of concrete mixes was evaluated through slump flow and V funnel tests. Some concrete mixes were prepared with 5 mm maximum size aggregates and other mixes with 20 mm maximum size aggregates. The effects of varying contents of SCMs (Fly ash F and GGBS) on flow behavior of SCC under binary blends were also studied. The results show that the maximum size of aggregates has effect on the flow behavior of SCC.

Tribological behaviors of self‒mated Cu36Zr48Ag8Al8 bulk metallic glass under H2SO4 conditions with different concentrations

Abstract This study investigated the tribological properties of Cu36Zr48Ag8Al8 BMG against Cu36Zr48Ag8Al8 BMG under H2SO4 corrosive conditions with different concentrations. Results show that Cu36Zr48Ag8Al8 BMG exhibits good tribological behaviors under H2SO4 conditions. Especially, when the material was soaked in 15 wt% H2SO4 solution, the friction coefficient and wear rate can be as low as 0.10 ± 0.01 and (0.28 ± 0.23) × 10−6 mm3 N−1m−1. It is mainly attributed to the existence of metal oxide films formed by surface oxidation and passivation actions as well as the fluid lubricating films formed by H2SO4 solution and dissolution reaction products ( A l 2 ( S O 4 ) 3 and CuS O 4 ) on the worn surfaces. These perfect properties promote Cu36Zr48Ag8Al8 BMG to have the promise to replace the stainless steel under H2SO4 corrosive condition.