scholarly journals Flexural Behavior of High Strength Concrete Incorporated Super Absorbent Polymer (SAP)

2018 ◽  
Vol 11 (3) ◽  
pp. 34-38
Author(s):  
Baidaa Khdheer
Keyword(s):  
High Strength Concrete ◽  
High Strength ◽  
Flexural Behavior ◽  
Reactive Powder Concrete ◽  
Super Absorbent Polymer ◽  
Strength Concrete ◽  
Group A ◽  
Group B ◽  
Reactive Powder ◽  
Absorbent Polymer

This research include the study of flexural behavior of reinforced concrete beams with and without addition of super absorbent polymer (SAP) to concrete, two groups of concrete mixture were used; each one have five concrete mixture (Reactive Powder Concrete RPC, Modified Reactive Powder Concrete, Self Compact Concrete SCC, High Strength Concrete HSC and Normal Strength Concrete NSC) four of them with high compressive strength and the last one with normal compressive strength. Group A casting concrete without addition of SAP, group B casting concrete with addition of SAP. Ten beams are molded of (200*300*1700) mm dimension with same steel reinforcement. Flexural tested for all beams was doing and load-deflection relationships of beams with and without SAP were established. Test results had shown that beams casting with addition of SAP (group B) proved to have larger load carrying capacity and llower deflection compared with group A.

scholarly journals Eliminating the Shrinkage of High Strength Concrete by using Super Absorbent Polymer (SAP)

2018 ◽  
Vol 11 (4) ◽  
pp. 8-13
Author(s):  
Baidaa Khdheer Ahmed
Keyword(s):  
Compressive Strength ◽  
High Strength Concrete ◽  
Autogenous Shrinkage ◽  
Drying Shrinkage ◽  
High Strength ◽  
Super Absorbent Polymer ◽  
Strength Concrete ◽  
Group A ◽  
Group B ◽  
Absorbent Polymer

High Strength Concrete (HSC) is one of the  most popular types of concrete used in the world. This type of concrete has a low rapid  hydration of cementation materials with low  w/cm and the external surrounding  environment condition exposed the HSC to  high autogenous shrinkage. If this shrinkage is  not treated well that well led to cracking, in  this case HSC need to convenient curing  necessary at the earliest time. This study  presents the use of Super Absorbent Polymer  (SAP) as internal curing agent to eliminate  shrinkage. Two types of shrinkage are tested in  this study (Autogenous shrinkage and drying  shrinkage).  Two groups of concrete mixes(A and B) are  studied in this study each group have five types  of concrete mixes, four mixes with high and  ultra-high compressive strength (RPC, MRPC, HSC and SCC) and the last one with normal  compressive strength (NSC). Group A  represent concrete mixes without SAP addition  and group B for concrete mixes with SAP.  SAP was added for all mixes at 0.3% by  weight of cement and adding 20ml water for  each gram of SAP, specimens with dimensions  (40*40*160) mm were used for testing  shrinkage for each mix with and without SAP,  average values for two specimens was taken as  a results. It was found that concrete mixes of  group B have lower shrinkage than the  shrinkage of concrete mixes in group A at 28  days age with reduction of autogenous  shrinkage(AS) of (57%, 35%, 37%, 44.5% and  37.5%) respectively and for drying shrinkage  the percentage of reduction was (89.5%, 72%,  82%, 70% and 71%) respectively, addition of  SAP to concrete mixes proves to have active  effect in reducing the shrinkage of concrete.

Effects of Silica Fume Addition on the Spalling Phenomena of Reactive Powder Concrete

2012 ◽  
Vol 174-177 ◽  
pp. 1090-1095 ◽  
Author(s):  
Kai Pei Tian ◽  
Yang Ju ◽  
Hong Bin Liu ◽  
Jin Hui Liu ◽  
Li Wang ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Vapor Pressure ◽  
Silica Fume ◽  
High Strength Concrete ◽  
High Strength ◽  
Reactive Powder Concrete ◽  
Spalling Resistance ◽  
Explosive Spalling ◽  
Strength Concrete ◽  
Reactive Powder

The explosive spalling of high-strength concrete due to fire is a problem that has garnered increasingly widespread attention, particularly the explosive spalling of reactive powder concrete (RPC). For years, based on the vapor pressure mechanism, the addition of fibers has been demonstrated to be somewhat effective in protecting against spalling. However, relevant experiments indicate that fibers are not effective for dense concrete, which is a challenge for the simple vapor pressure mechanism in providing spalling resistance for RPC. The authors found that silica fume plays an important role in the explosive spalling of RPC. Thus, four classes of RPCs with different ratios of silica fume were prepared, and the spalling phenomena and the inner temperature distribution during heating were investigated. The results show that silica fume content has a prominent effect on the spalling process of RPC.

scholarly journals REACTIVE POWDER CONCRETE DENGAN SUMBER SILIKA DARI LIMBAH BAHAN ORGANIK

Teras Jurnal ◽  
2017 ◽  
Vol 3 (2) ◽  
pp. 157
Author(s):  
Yulius Rief Alkhaly
Keyword(s):  
Silica Fume ◽  
High Strength Concrete ◽  
High Performance ◽  
High Strength ◽  
Reactive Powder Concrete ◽  
Normal Concrete ◽  
Green Concrete ◽  
Strength Concrete ◽  
Reactive Powder

<p>Reactive powder concrete (RPC) merupakan varian baru dari beton mutu ultra tingggi (ultra high strength concrete) yang diperkenalkan kepada umum pertama kali pada tahun 1994. Beton modern ini memiliki beberapa keunggulan dibandingkan beton konvensional (normal concrete) atau beton kinerja tinggi (high performance concretes). Penelitian tentang RPC di Indonesi masih sangat terbatas, RPC pertama bermaterial lokal Indonesia dikembangkan tahun 2009, dengan sumber silika berasal dari silica fume. Sebagai bagian dari berbagai penelitian lanjutan tentang RPC, hasil akhir dari riset ini diharapkan dapat menghasilkan RPC yang benar-benar sesuai dengan karakteristik material di Indonesia. Sumber silika yang digunakan berasal dari limbah bahan organik sehingga dapat menekan biaya produksi dan menghasilan green concrete yang dapat mengurangi dampak negatif limbah terhadap lingkungan.</p><p><strong>Kata kunci:</strong> Reactive Powder Concrete, Silika, Limbah Bahan Organik</p>

scholarly journals Compressive Behavior and Mechanical Characteristics and Their Application to Stress-Strain Relationship of Steel Fiber-Reinforced Reactive Powder Concrete

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Baek-Il Bae ◽  
Hyun-Ki Choi ◽  
Bong-Seop Lee ◽  
Chang-Hoon Bang
Keyword(s):  
Mechanical Properties ◽  
High Strength Concrete ◽  
Steel Fiber ◽  
High Strength ◽  
Steel Fibers ◽  
Reactive Powder Concrete ◽  
Test Results ◽  
Strength Concrete ◽  
Estimation Equations ◽  
Reactive Powder

Although mechanical properties of concrete under uniaxial compression are important to design concrete structure, current design codes or other empirical equations have clear limitation on the prediction of mechanical properties. Various types of fiber-reinforced reactive powder concrete matrix were tested for making more usable and accurate estimation equations for mechanical properties for ultra high strength concrete. Investigated matrix has compressive strength ranged from 30 MPa to 200 MPa. Ultra high strength concrete was made by means of reactive powder concrete. Preventing brittle failure of this type of matrix, steel fibers were used. The volume fraction of steel fiber ranged from 0 to 2%. From the test results, steel fibers significantly increase the ductility, strength and stiffness of ultra high strength matrix. They are quantified with previously conducted researches about material properties of concrete under uniaxial loading. Applicability of estimation equations for mechanical properties of concrete was evaluated with test results of this study. From the evaluation, regression analysis was carried out, and new estimation equations were proposed. And these proposed equations were applied into stress-strain relation which was developed by previous research. Ascending part, which was affected by proposed equations of this study directly, well fitted into experimental results.

Blast-resistant characteristics of ultra-high strength concrete and reactive powder concrete

2012 ◽  
Vol 28 (1) ◽  
pp. 694-707 ◽  
Author(s):  
Na-Hyun Yi ◽  
Jang-Ho Jay Kim ◽  
Tong-Seok Han ◽  
Yun-Gu Cho ◽  
Jang Hwa Lee
Keyword(s):  
High Strength Concrete ◽  
High Strength ◽  
Reactive Powder Concrete ◽  
Strength Concrete ◽  
Reactive Powder

scholarly journals STRUCTURAL BEHAVIOR OF HYBRID REINFORCED CONCRETE COUPLED BEAMS CONTAINING REACTIVE POWDER CONCRETE AND HIGH STRENGTH CONCRETE

2021 ◽  
Vol 25 (02) ◽  
pp. 68-77
Author(s):  
Hiba A. Sabit ◽  
◽  
Aamer N. Abbas ◽  
Keyword(s):  
High Strength Concrete ◽  
Ultimate Load ◽  
High Strength ◽  
Structural Behavior ◽  
Reactive Powder Concrete ◽  
Normal Strength Concrete ◽  
Strength Concrete ◽  
Coupled Beams ◽  
Normal Strength ◽  
Reactive Powder

Reactive powder concrete and high strength concrete have superior mechanical and structural properties, however, the major drawback of this new construction material is its high cost compared to traditional concrete. This study presents an experimental investigation on the structural behavior of hybrid rectangular cross section (coupled) reinforced concrete beams poured with normal and high strength concrete (HSC) at compression chord, normal strength concrete (NSC) at ribs, and reactive powder concrete (RPC) at tension chord. The experimental work consists of pouring and testing four specimens with dimensions (1100mm length, 100 mm width, and 400 mm height). First specimen, rectangular solid normal concrete beam for comparison with specimens, second specimen, coupled beam poured with normal strength concrete at top chord, and two other specimens of coupled beams cast with high strength concrete with two compressive strength (50 MPa and 70 MPa) at top chord. The effect of top chord concrete type at each specimen on ultimate load capacity, energy absorption, deflection and cracking load are studied in this investigation. Experimental results showed that the ultimate load carrying capacity and energy absorption increased to 76.9 % and 108.33 % respectively, compared with the solid specimen and recorded a reduction in deflection values through loading life and cracking load when using higher compressive strength of high strength concrete in compression chord in addition to reactive powder concrete in tension zone.

Flexural behavior of partially fiber-reinforced high-strength concrete beams reinforced with FRP bars

2018 ◽  
Vol 161 ◽  
pp. 587-597 ◽  
Author(s):  
Haitang Zhu ◽  
Shengzhao Cheng ◽  
Danying Gao ◽  
Sheikh M. Neaz ◽  
Chuanchuan Li
Keyword(s):  
High Strength Concrete ◽  
Concrete Beams ◽  
High Strength ◽  
Flexural Behavior ◽  
Fiber Reinforced ◽  
Strength Concrete ◽  
Frp Bars

Influence of Nano Particles in the Flexural Behavior of High-Strength Reinforced Concrete Beams

2021 ◽  
Vol 1160 ◽  
pp. 25-43
Author(s):  
Naglaa Glal-Eldin Fahmy ◽  
Rasha El-Mashery ◽  
Rabiee Ali Sadeek ◽  
L.M. Abd El-Hafaz
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
High Strength Concrete ◽  
High Strength ◽  
Reinforced Concrete Beams ◽  
Nano Particles ◽  
Flexural Behavior ◽  
Single Type ◽  
Strength Concrete ◽  
Flexural Ductility

High strength concrete (HSC) characterized by high compressive strength but lower ductility compared to normal strength concrete. This low ductility limits the benefit of using HSC in building safe structures. Nanomaterials have gained increased attention because of their improvement of mechanical properties of concrete. In this paper we present an experimental study of the flexural behavior of reinforced beams composed of high-strength concrete and nanomaterials. Eight simply supported rectangular beams were fabricated with identical geometries and reinforcements, and then tested under two third-point loads. The study investigated the concrete compressive strength (50 and 75 N/mm2) as a function of the type of nanomaterial (nanosilica, nanotitanium and nanosilica/nanotitanium hybrid) and the nanomaterial concentration (0%, 0.5% and 1.0%). The experimental results showed that nano particles can be very effective in improving compressive and tensile strength of HSC, nanotitanium is more effective than nanosilica in compressive strength. Also, binary usage of hybrid mixture (nanosilica + nanotitanium) had a remarkable improvement appearing in compressive and tensile strength than using the same percentage of single type of nanomaterials used separately. The reduction in flexural ductility due to the use of higher strength concrete can be compensated by adding nanomaterials. The percentage of concentration, concrete grade and the type of nanomaterials, could predominantly affect the flexural behavior of HSRC beams.

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