International Journal of Civil Engineering and Technology (IJCIET) Volume 10, Issue 04, April 2019, pp. 899–911, Article ID: IJCIET_10_04_095 Available online at http://www.iaeme.com/ijmet/issues.asp?JType=IJCIET&VType=10&IType=4 ISSN Print: 0976-6308 and ISSN Online: 0976-6316 © IAEME Publication Scopus Indexed EFFECT OF WASTE MARBLE POWDER AND POLYPROPYLENE FIBER ON THE PROPERTIES OF SELF-CURING CONCRETE Mohammad Abid ME Research Scholar, Civil Engineering Department, Chandigarh University, Punjab, India Khushpreet Singh Assistant Professor, Civil Engineering Department, Chandigarh University, Punjab, India ABSTRACT Globally the value of water and natural resources is increasing day by day. From that point of view, it is desired to put efforts to find out techniques to safeguard water from wastage and utilize the waste materials. The utilization of these waste materials could have a significant effect on hardened characteristics of the concrete. However, the use of a self-curing chemical agent has a positive effect on concrete. The moisture distribution from the atmosphere can also change the mechanical properties of concrete. In this study, Polyethylene-glycol 400 was designated as a self-curing agent along with waste marble powder and polypropylene fiber to determine the mechanical characteristics of Self-curing concrete (SCC). The experimental investigation was carried out for mix design of M30 grade in SCC with 1 % Polyethylene-glycol 400, and (0.5, 1, 1.5) % of polypropylene fiber as in the concentration of cement. It also defines the usage of different percentages, such as (5, 10, 15) % of waste marble powder as a partial replacement of fine aggregate in an SCC. Various tests had been conducted on hardened properties of SCC, such as [Compressive, Flexural, and Tensile] strength, X-ray Powder Diffraction (XRD), Scanning Electron Microscopy (SEM) & Energy Dispersive X-Ray Spectroscopy (EDS) to evaluate the strength properties of SCC. The results signify that the utilization of waste marble powder and polypropylene fiber enhance the mechanical characteristics of self-curing concrete as compared with controlled concrete of air-cured (C0) and moist cured (C0′). The optimum values were 0.5 % of polypropylene fiber and 15 % of marble powder enhanced the mechanical characteristics of self-curing concrete. Key words: Self Curing concrete, Water retention, Polyethylene-glycol 400, Waste Marble Powder & Polypropylene-Fiber. Cite this Article: Mohammad Abid and Khushpreet Singh, Effect of Waste Marble Powder and Polypropylene Fiber on the Properties of Self-Curing Concrete, International Journal of Civil Engineering and Technology 10(4), 2019, pp. 899–911. http://www.iaeme.com/IJCIET/issues.asp?JType=IJCIET&VType=10&IType=4 http://www.iaeme.com/IJCIET/index.asp 899 editor@iaeme.com Mohammad Abid and Khushpreet Singh 1. INTRODUCTION Production of industrial waste has become a major challenge, exigency to handle it by time because it had generated a lot of waste and expand raw materials and an excessive amount of energy [1]. However, different types of wastes can be utilized in a concrete product, such as Fly-ash, Slag, Silica fume, Tire wastes and marble powder [2, 3, 4]. Many researchers have investigated that the mineral admixtures improves some fresh and hardened concrete properties that can be used positively and economically in concrete [5]. Waste marble improves strength properties of the hardened concrete as an admixture material with cement or as an aggregate in conventional concrete [4]. Usage of self-curing concrete helps for water scarcity terrains. During the hydration of cement, concrete has to be continually cured to avoid Self-desiccation [6]. In the case of traditional curing, such as for vertical structure components is still a technical problem and it also escalates the cost and labor efforts [7]. Not performing curing will definitely save water and the curing time, which would positively alter the construction costs. Many researchers observed the failure of curing methods for high strength concrete in high rise structures [8]. The water retention process performed by the chemical agent like Polyethylene-glycol, which reduces the level of water evaporation from the exterior surface of the concrete [6, 9, 10, 11, 12, 13, 14]. Most often two types of fiber are utilized in concrete such as polypropylene-fiber, and steel fiber. Many researchers studied the effect of polypropylene-fiber in concrete that enhances the properties of concrete like tensile stress, fracture toughness, impact strength, thermal shock, resistance to fatigue, wear, shrinkage, and durability, etc. Fiber minimizes the brittleness and improves the ductility properties of the concrete [15, 16]. Many researchers also indicated an enhancement of compressive strength, tensile strength, and flexure strength with high fiber volume. The higher volume of fiber supports concrete to influence tension stabilization and elasticity [17]. 2. EXPERIMENTAL PROGRAM Experimental study conducted to evaluate self-curing concrete with a chemical agent Polyethylene-glycol 400 to ensure the physical and mechanical properties of the concrete by using marble powder as a waste material incorporated with Polypropylene-fiber. Scanning electron microscopy (SEM) was done to study the changes in microstructure at different magnifications and X-Ray Diffraction (XRD) was performed to identify and study the crystalline material. The Energy Dispersive X-Ray Spectroscopy (EDS) was also conducted to study the elemental analysis of the sample. 2.1. Materials 2.1.1. Cement The existing experimental study used the Ordinary Portland cement 43 grade conforming to IS 269:1976. Table 1 shows the physical properties of cement used in self-curing concrete. Table 1 Physical properties of Portland cement Sr. no 1 2 3 4 5 6 Physical Properties Fineness (%) Consistency (%) Initial setting time (min) Final setting time (min) Compressive Strength for 28 days (N/mm2) Specific gravity http://www.iaeme.com/IJCIET/index.asp 900 Portland cement 1 31 116 253 46.8 3.14 editor@iaeme.com Effect of Waste Marble Powder and Polypropylene Fiber on the Properties of Self-Curing Concrete Fig. 1 Partial size distribution of fine aggregate, coarse aggregate, and waste marble powder 2.1.2. Fine aggregate In this study, fine aggregate confirming to IS 383-1970 used. Sieve analysis was conducted to determine the gradation of fine aggregate and particle size should be less than 4.75mm according to IS code. Table 2 shows the physical characteristics of the fine aggregate used in the present study of the self-curing concrete. Table 2 Physical properties of Fine aggregate Sr. no 1 2 3 4 5 6 Physical Properties Fineness modulus (%) Water absorption (%) Bulk density (kg/liter) Rodded Bulk density (kg/liter) Percentage voids (%) Specific gravity Fine aggregate 2.88 2.04 1.48 1.76 43 2.60 2.1.3. Coarse aggregate Coarse aggregate is used conforming to IS 383-1970. Table 3 shows the physical characteristics of coarse aggregate used in concrete. Table 3 Physical properties of coarse aggregate Sr. no 1 2 3 4 5 6 Physical Properties Fineness modulus (%) Water absorption (%) Bulk density (kg/liter) Rodded Bulk density (kg/liter) Percentage voids (%) Specific gravity Coarse aggregate 7.88 1.01 1.42 1.54 45.65 2.62 2.1.4. Polypropylene-Fibers The manufactured PP-fiber is an artificial and thermoplastic product. Containing various properties of high strength; enhance the durability, low modulus of elasticity, excellent ductility, and low price [15, 18]. For current study 12mm length of mono-filament fiber is used in the self-cured concrete. Table 4 shows properties of Polypropylene-Fibers in the present study of the concrete mixture. http://www.iaeme.com/IJCIET/index.asp 901 editor@iaeme.com Mohammad Abid and Khushpreet Singh Table 4 Shows the physical properties of PP-fiber Sr. no 1 2 3 4 5 6 7 8 9 Properties Product Polymer Length Specific gravity Melting range Strength Diamond length Elongation Thickness Property Value Synthetic polypropylene fiber 100% virgin PP home-polymer Graded (10 to 20) mm 500-550 N/mm2 162-164 Co 10-12 mm H (OCH2CH2) nOH 15-18 % 35-40µ 2.1.5. Polyethylene-glycol Polyethylene glycol (PEG) is an abstract form of polymer ethylene oxide with the addition of water in general formula H (OCH2CH2)nOH. PEG is one of the most common water-soluble polymers, non-volatile, non-toxic, neutral, non-irritating, odorless and lubricating chemical agent utilized in a variety of pharmaceuticals [13, 19]. After casting and finishing, the use of water for curing purposes is eliminated in the concrete. So, economically it reduces the graph of water in a construction site. In this experimental study, PEG-400 is used as a chemical agent to avoid the chemical shrinkage, and leading to minimizing internal relative moisture [20]. PEG-400 is commercially available in a variety of molecular weights from 300 g/mol of 107 g/mol [21]. Table 5 shows properties of PEG-400 in the present study of the concrete mixture. Table 5 Characteristics of polyethylene-glycol 400 Sr. no 1 2 3 4 5 6 7 8 9 Physical Properties Molecular weight (gm/mol) PH Appearance Color Hydroxyl value Nature Molecular formula Density (gr/cm3) Specific gravity Property Value 400 >6 Clear liquid White 300 Water soluble H (OCH2CH2) nOH 1.125 1.12 at 27Co 2.1.6. Waste Marble Powder In this study, locally available waste marble powder is used. Sieve analysis is conducted same as on fine aggregate. Table 6 shows the physical properties of waste marble powder used in self-cured concrete. Table 6 Physical properties of waste marble powder Sr. no 1 2 6 Physical Properties Fineness modulus (%) Water absorption (%) Specific gravity http://www.iaeme.com/IJCIET/index.asp 902 Waste Marble Powder 3.52 0.4 2.67 editor@iaeme.com Effect of Waste Marble Powder and Polypropylene Fiber on the Properties of Self-Curing Concrete 3. MIX PROPORTIONS For this experimental study, the mix design of M30 grade prepared according to IS 10262:2009. To find out the mechanical characteristics of fiber reinforced self-curing concrete with waste marble powder (WMP). In all, eleven mix proportions performed, and the first (C0 and C0′) was a control mix. Thus, C0 is air-cured, and C0′ mix is moist cured (water pound) cured of a control concrete without (Polyethylene glycol 400, Polypropylene fiber and marble powder). All mix proportions molded and tested indoor, and the room temperature was about (22 ± 2) 0C. The volume of PEG-400 repetitively the same for all mix proportions is 1 percent. According to various research papers, 1% of PEG 400 is the optimum value for M30 concrete [22]. The percentage replacements of polypropylene-fiber with cement were (0.5, 1, and 1.5) % and the percentage replacement of waste marble powder with fine aggregate is (5, 10, 15) %. Certain proportions have been evaluated to determine the accurate results. Table 7 illustrates the mix compositions of C0 (air-cured) and C0′ (moist-cured) of controlled concrete with further mix proportions to find out the results of self-curing concrete. Table 7 Composition of Self-curing concrete Mix Cement Water F.A NO (kg⁄m3) (kg⁄m3) (kg⁄m3) C.A (kg⁄m3) C0 C0' D1 D2 D3 D4 D5 D6 D7 D8 D9 1093.22 1093.22 1088.35 1088.35 1088.35 1083.48 1083.48 1083.48 1081.35 1081.35 1081.35 425.7 425.7 423.57 423.57 423.57 421.44 421.44 421.44 419.31 443.25 443.25 191.6 191.6 191.6 191.6 191.6 191.6 191.6 191.6 191.6 191.6 191.6 664.92 664.92 661.96 661.96 661.96 659.00 659.00 659.00 658.01 658.01 658.01 PEG- PPPP400 Fiber Fiber (%) (%) (kg⁄m3) 1 1 1 1 1 1 1 1 1 0.5 0.5 0.5 1 1 1 1.5 1.5 1.5 2.13 2.13 2.13 4.26 4.26 4.26 6.39 6.39 6.39 Waste Marble Powder (%) 5 10 15 5 10 15 5 10 15 Waste Marble Powder (kg⁄m3) 33.10 66.20 99.30 32.95 65.90 98.85 32.90 65.80 98.70 4. RESULTS & DISCUSSION 4.1. Compressive strength The compressive strength of SCC investigated for 7, 14, and 28 days after casting of concrete in the compressive machine. Cube specimens of size (150 x 150 x 150) mm according to IS 10262:1082 were used for casting. Experimental investigation shows high value of 33.89 MPa for D3 concrete proportion. The specified value of D3 increased to 23.02 % & 14.81 % against air-cured (without curing) & moist cured samples of control concrete. Fig. 2 shows different mix proportions compared with control concrete. However, the value found from an experimental investigation that 37.29 MPa for D3 is a high value of all mix proportion after 14 days of testing. In Comparison to control concrete the value of the D3 mix proportion increased to 21.16 % & 13.36 % against C0 (air-cured) & C0′ (moist cured) samples of controlled concrete. Fig. 2 also illustrates the 28 days compressive strength of fiber reinforced self-cured concrete. The results evaluated on the various mix proportions of the concrete. It is observed that the 15% of the waste marble powder with 0.5 % polypropylene fiber enhance with self-cured agent by utilizing 1 % of PEG-400. The maximum strength of D3 mix proportion obtained the value of 41.13 MPa. Meanwhile, the value of D3 is increased to 22.37 % & 13.66 % as compared to control concrete samples of C0 & C0′. http://www.iaeme.com/IJCIET/index.asp 903 editor@iaeme.com Compressive Strength (N/mm2) Mohammad Abid and Khushpreet Singh 45.00 40.00 35.00 30.00 25.00 20.00 15.00 10.00 5.00 0.00 7 days 14 days 28 days C0 C0′ D1 D2 D3 D4 D5 D6 D7 D8 D9 Mix Proportions Fig. 2 Compressive Strength of M30 for 7, 14, & 28 days 4.2. Flexural Strength Flexural strength was performed as per IS 10262:1082 code. The flexural strength of the concrete specimens was determined after (7, 14, and 28 days) period. Fig. 3 illustrates the flexural strength of all mix proportion on 7 days testing. Addition of waste marble powder (WMP) and PP-fiber significantly increased the flexural strength. The results show the highest value out from all trail mixes on 7 days flexural strength is for D3 i.e. 6 MPa. The optimum value for WMP is 1.5 % and for PP-fiber is 0.5%. As compared to C0 and C0′, of controlled concrete the enhancement percentage of D3 is about 59.5 % & 36.67 %. The maximum value for 14 days observed is D3 mix i.e. 6.13 MPa. After comparing with controlled concrete sample C0 and C0′ the percentage increase is 24.14 & 33.44 %. Fig. 3 also showing 28 days of flexural strength for all mixes proportions of a self-curing concrete. In general, proper distribution of PP-fiber and the micro finer properties of the waste marble powder maintain control concrete to enhance their hardened characteristics of the concrete. The results illustrate for 28 days that D3 has got 6.48 MPa as the highest value when compared to C0 and C0′. The percentage increase for D3 is 24.69 % & 16.98 %. Flexural Strength (N/mm2) 7.00 6.00 5.00 4.00 7 days 3.00 14 days 2.00 28 days 1.00 0.00 C0 C0′ D1 D2 D3 D4 D5 D6 D7 D8 D9 Mix Proportions Fig. 3 Flexural Strength of M30 for 7, 14, & 28 days 4.3. Split Tensile Strength To determine the split tensile strength, IS 10262:1082 was used. The split strength of the concrete specimens was determined after (7, 14, and 28 days) period. The split tensile strength of 7 days is shown in Fig. 4. The result signified that the highest value of self-curing in trail http://www.iaeme.com/IJCIET/index.asp 904 editor@iaeme.com Effect of Waste Marble Powder and Polypropylene Fiber on the Properties of Self-Curing Concrete mix is for D3 i.e. 3.31 MPa. Thus, when compared with the controlled concrete sample of C0 and C0′, D3 was shown a percentage increase as 37.76 % & 34.14 %. For 14 days testing all specimens obtained higher values than the controlled concrete samples. When compared D3 (3.65 MPa) with C0 and C0′, of controlled concrete the improvement in percentages observed is 44.38 % & 33.70 %. Fig. 4 also shows the results for 28 days split tensile strength of a selfcuring concrete. The achieved value of D3 shows the optimum percentages of WMP & PPfiber. The results illustrated that D3 obtained 3.81MPa strength. When, Compared with C0 and C0′, the improvement percentage for D3 is 39.63 % & 32.55 %. Split tensile Strength (N/mm2) 4.50 4.00 3.50 3.00 2.50 7 days 2.00 14 days 1.50 28 days 1.00 0.50 0.00 C0 C0′ D1 D2 D3 D4 D5 D6 D7 D8 D9 Mix Proportions Fig. 4 Split tensile Strength of M30 for 7, 14, & 28 days (a) Before preparation of mix (b) During preparation of mix (c) After casting of samples Fig. 5 Different images demonstrating the lab works Table 8 Result for M30 grade of a Self-curing concrete Mix No C0 C0′ Trail Mix PEG400 (%) PPFiber (%) - - Waste Marble Powder (%) - Compressive Strength (N/mm2) 7 days 14 days Split Tensile Strength (N/mm2) Durations Flexural strength (N/mm2) 28 days 7 days 14 days 28 days 7 days 14 days 28 days 26.09 29.4 31.93 28.87 32.31 35.51 2.04 2.18 2.03 2.42 2.3 2.57 2.43 3.8 4.65 4.08 4.88 5.38 http://www.iaeme.com/IJCIET/index.asp 905 editor@iaeme.com Mohammad Abid and Khushpreet Singh D1 D2 D3 D4 D5 D6 D7 D8 D9 1 1 1 1 1 1 1 1 1 0.5 0.5 0.5 1 1 1 1.5 1.5 1.5 5 10 15 5 10 15 5 10 15 26.44 25 33.89 30.33 28.71 28.4 25.18 23.84 31 33.71 32.24 37.29 33.67 34.51 35.09 32.93 31.82 35.11 35.93 35.04 41.13 37.44 37.93 38.33 35.78 34.93 38.98 2.62 2.61 3.41 2.94 2.19 2.97 2.48 2.64 3.13 2.82 3.28 3.65 3.25 3.08 3.4 3.06 3.36 3.43 2.94 3.45 3.81 3.42 3.36 3.5 2.94 3.47 3.64 4.88 5.38 6 5.63 4.9 3.63 3.58 3.6 3.38 5.28 5.4 6.13 5.38 5.48 3.88 3.13 3.78 4.88 5.9 6.33 6.48 6.08 5.63 5 4.2 5.15 5.38 4.4. Scanning Electron Microscopy (SEM) & Energy Dispersive X-Ray Spectroscopy (EDS) Scanning electron microscopy (SEM) has been used to investigate the internal or microstructure of complex element for many years. Thus, EDS is used to determine the chemical composition of the materials. For the current study, 7-10 mm samples were coated with carbon and evaluated for SEM and EDS by applying landing energy of 20 KW. The SEM analysis was conducted for control concrete C0′ and the optimum value of a self-curing concrete of D3 mix proportion. For C0′ (moist cured) the investigation describes that during the cement hydration and low water-cement ratio micro-cracks are widely present in the sample. The width of cracks in a sample shown in Fig. 6, are (817, 786.9, 531.2, 497.9, 414.9) nm. Capillary cracks reduce the durability and strength of the concrete. In D3 mix shown in Fig. 7 utilization of PP-fiber reduced the micro-cracks. However, Fig. 7 shows that the capillary cracks present in the sample. Thus, the capillary cracks can be reduced with the proper vibration of the concrete. Fig. 8, and 9 determined the EDS examined for both C0′ (moist cured) control concrete and D3 mix of the self-curing concrete. Weak bound in ITZ Cracks in Paste Cross link C-S-H gel Aggregate Mortar Voids ITZ Cracks in Void Fig. 6 Scanning electron microscopy for C0′ of control concrete http://www.iaeme.com/IJCIET/index.asp 906 editor@iaeme.com Effect of Waste Marble Powder and Polypropylene Fiber on the Properties of Self-Curing Concrete Cross link of C-S-H gel PP-Fiber Void PP-Fiber Crack in Void Fig. 7 Scanning electron microscopy for D3 of a self-curing concrete Table 9 EDS result for C0′ mix of control concrete. Element C N O Na Mg Al Si P Cl K Ca Fe Total Mass (%) 54.59 ± 2 8.52 ± 5.53 16.15 ± 2.71 0.08 ± 0.37 0.36 ± 0.33 14.79 ± 0.98 1.37 ± 0.42 1.58 ± 0.42 0.17 ± 0.25 nd 1 ± 0.48 1.38 ± 0.88 100 http://www.iaeme.com/IJCIET/index.asp 907 Atom (%) 66.03 ± 2.42 8.84 ± 5.55 14.66 ± 2.46 0.05 ± 0.24 0.22 ± 0.2 7.96 ± 0.53 0.71 ± 0.22 0.74 ± 0.2 0.07 ± 0.1 nd 0.36 ± 0.17 0.36 ± 0.23 100 editor@iaeme.com Mohammad Abid and Khushpreet Singh Fig. 8 Energy Dispersive X-Ray Spectroscopy (EDS) C0′ of control concrete Table 10 EDS result for D3 mix of Self-curing concrete. Element C O Na Mg Al Si P Cl K Ca Fe Total Mass (%) 54.22 ± 4.65 28.20 ± 8.99 8.42 ± 2.25 1.35 ± 1.31 3.70 ± 1.36 2.19 ± 1.08 nd 0.17 ± 0.57 1.09 ± 0.71 nd 0.67 ± 1.2 100 Atom (%) 64.87 ± 5.57 25.33 ± 8.08 5.26 ± 1.41 0.80 ± 0.77 1.97 ± 0.72 1.12 ± 0.55 nd 0.07 ± 0.23 0.40 ± 0.26 nd 0.17 ± 0.31 100 Fig. 9 Energy Dispersive X-Ray Spectroscopy (EDS) D3 of Self-curing concrete 4.5. X-ray Powder Diffraction (XRD) X-ray powder diffraction (XRD) is used for identifying and measuring the mass fractions of various crystalline single-phase minerals, chemical composites, porcelain or other engineering materials. XRD can also categorize the multiple phases in micro-crystalline mixtures. Test samples were passed from 325-micron sieve [23], and tested after 28 days. Fig. 10 & 11 shows the XRD graph for chemical compositions of moist cured (C0′) & D3 mix proportion of a self-curing concrete. The graph illustrated that for both samples, the maximum value is SiO2 as a main component. The minor chemical components are Ca(OH)2, MgO, Tobermorite Ca5Si6O16(OH)2, K-Phase (Ca-fedorite) Ca7Si16O38(OH)2, Aluminosilicate (Al2SiO5), and Kaolinite Al2Si2O5(OH)4. The presence of SiO2 indicates the improvement of mechanical characteristics of the concrete. The functions of nano-particles SiO2 is to accelerate C-S-H gel for enhancement of Ca(OH)2 quantity, particularly in the initial period of hydration of cement of samples. Further, SiO2 functions as nano-filler, to recover the pore surfaces in the concrete [24]. http://www.iaeme.com/IJCIET/index.asp 908 editor@iaeme.com Effect of Waste Marble Powder and Polypropylene Fiber on the Properties of Self-Curing Concrete Fig. 10 X-ray diffraction array of controlled concrete of C0′ Fig. 11 X-ray diffraction array of D3 mix proportion 5. CONCLUSIONS The use of polyethylene glycol in a self-curing concrete enhance the mechanical characteristics of concrete beneath air curing condition. Furthermore, the chemical agent retained the water for hydration of the cement process resulting in a reduction of pores, voids, and the cement paste bond force with aggregate was higher as compared with controlled concrete. An addition of marble powder and polypropylene fiber significantly enhanced the mechanical characteristics of self-curing concrete as shown in Table 8. The content of 15 % of waste marble powder and 0.5 % of polypropylene fiber is the optimum values for a self-curing concrete. The combination of waste marble powder in self-curing concrete enhances the hardened characteristics of concrete. However, the combination of cement and marble powder forms the better bond force among marble powder, cement paste, and aggregate as shown in Fig. 7 of SEM analysis for self-curing concrete samples. http://www.iaeme.com/IJCIET/index.asp 909 editor@iaeme.com Mohammad Abid and Khushpreet Singh In the present study, using of waste marble powder with PP-fiber increase the compressive strength of a self-curing concrete. The optimum value determined was for D3 mix proportion obtained 41.13 MPa for 28 days. As compared with C0 & C0′, of controlled concrete the improved value of D3 was (22.37 & 13.66) %. The test results reported that utilization of polypropylene fiber enhances the flexural and split tensile strength of self-curing concrete as compared to controlled mixes of air-cured (C0) or moist cured (C0′) as signified in Table 8. The optimum value of D3 mix proportion when compared with C0 & C0′ of controlled concrete shows percentage increase as (37.76 & 34.14) % and (39.63 & 32.55) % respectively. Usage of PEG-400 saves 2-3 m3 of water for 1m3 of concrete and waste marble powder reduces the extraction of an excessive amount of sand. SEM images have shown weak ITZ and cracks on samples of controlled concrete, which were very minimal in the self-cured concrete samples. After performing the XRD, the results signify the highest intensity value of SiO2 for D3 as compared to the controlled concrete. REFERENCES [1] Kamal et al. Steel – concrete bond potentials in self-compacting concrete mixes incorporating dolomite powder. 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