The Impact of Rice Husks Ash on Some Mechanical Features of Reactive Powder Concrete with High Sulfate Content in Fine Aggregate

Composite materials have been demonstrated to possess excellent antipenetration capacities, but the existing studies have not involved the penetration characteristics of ceramic-concrete composite targets. To investigate the antipenetration mechanisms of fiber ceramic-reactive powder concrete (FC-RPC) composite targets, three pieces of FC-RPC composite targets were designed to perform penetration tests. Antipenetration tests were performed with a special howitzer with a diameter of 125 mm. The test parameters, such as the impact velocity, failure pattern of projectiles, penetration depth, crater diameter, and failure model of targets, were obtained. It was found that the FC-RPC targets exhibited an excellent antipenetration capacity and failed in a ductile manner, the target caused an obvious erosion effect on projectiles at low speed (i.e., 375 m/s), and the antipenetration performance of the composite target was improved by increasing the thickness of the FC target. Simultaneously, numerical simulations of FC-RPC targets subjected to projectile impact were carried out by using LS-DYNA codes. Separately, combined and integrated finite element models were used to analyze the effect of the fiber layer in the composite target. The numerical results of the combined model were in good agreement with the experimental data, and the reliabilities of simulation were validated. The differential protection factor of the FC-RPC targets was obtained based on the penetration tests and numerical simulation, and an empirical formula for multilayer targets was presented.

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Ballistic resistance and energy absorption of honeycomb structures filled with reactive powder concrete prisms

Journal of Sandwich Structures & Materials ◽

10.1177/1099636215625891 ◽

2017 ◽

Vol 19 (5) ◽

pp. 544-571 ◽

Cited By ~ 8

Author(s):

Xiaochao Jin ◽

Tao Jin ◽

Buyun Su ◽

Zhihua Wang ◽

Jianguo Ning ◽

...

Keyword(s):

Energy Absorption ◽

Sandwich Structures ◽

Design Parameters ◽

Reactive Powder Concrete ◽

Velocity Range ◽

Hexagonal Cell ◽

Ballistic Resistance ◽

Honeycomb Sandwich ◽

Reactive Powder ◽

The Impact

Two kinds of innovative re-entrant and hexagonal cell honeycomb sandwich structures filled with reactive powder concrete were proposed, and the ballistic resistance and energy absorption of the sandwich structures were investigated by numerical simulations. The deformation and failure modes of the different structures were analyzed and evaluated in detail. The honeycomb sandwich structures filled with reactive powder concrete prisms improved the capacity of ballistic resistance and energy absorption significantly, compared to the normal reactive powder concrete plates and sandwich structures without reactive powder concrete prisms. The analysis shows that the auxetic re-entrant cell honeycomb sandwich structures have a better ballistic performance than the hexagonal cell honeycomb sandwich structures. The sandwich structures were subjected to impact by three kinds of projectiles: flat, hemispherical and conical nosed. The ballistic limit of the flat nosed projectile is the highest, while the impact performance of the conical and hemispherical nosed projectiles is obviously different from the flat nosed projectile, especially in a relative high velocity range. The sharper nose leads to a higher value of exit velocity and mass loss. In addition, effects of different design parameters on ballistic resistance were also studied by changing the thickness of honeycomb cell and face plates. Results indicate that the thickness of honeycomb walls and face plates have significant effect on the ballistic resistance and energy absorption in a relative low velocity range, while there are no big differences when the initial impact velocity exceeds 400 m/s.

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Research on Impact Behavior of Reactive Powder Concrete

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.150-151.779 ◽

2010 ◽

Vol 150-151 ◽

pp. 779-782

Author(s):

Qing Xin Zhao ◽

Zhao Yang Liu ◽

Jin Rui Zhang ◽

Ran Ran Zhao

Keyword(s):

Compressive Strength ◽

Impact Toughness ◽

Flexural Strength ◽

Steel Fiber ◽

Volume Fraction ◽

Impact Behavior ◽

Reactive Powder Concrete ◽

Flexural Toughness ◽

Reactive Powder ◽

The Impact

By means of the three-point bending impact equipment, with the measurement of ultrasonic velocity, the impact behavior and damage evolution of reactive powder concrete (RPC) with 0, 1%, 2% and 3% volume fraction of steel fiber were tested. The results showed that steel fiber significantly improved the compressive strength, flexural strength, flexural toughness and impact toughness of RPC matrix. The compressive strength, flexural strength, flexural toughness of RPC with 3% steel fiber increased by 40.1%, 102.1%, and 37.4 times than that of plain concrete, respectively, and simultaneously, the impact toughness of RPC with 3% steel fiber was 93.2 times higher than that with 1% steel fiber. RPC with 2% and 3% steel fiber dosage both had relatively high compressive strength, flexural strength and flexural toughness; however, compared with the sample with 2% steel fiber dosage, the impact toughness of RPC with 3% steel fiber dosage increased by more than 10 times. Therefore, taking economy and applicability into consideration, if we mainly emphasis on the compressive strength, flexural strength and flexural toughness, RPC with 2% steel fiber is optimal. While if impact toughness is critical, RPC with 3% steel fiber would be the best choice.

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The Effect of Various Polynaphthalene Sulfonate Based Superplasticizers on the Workability of Reactive Powder Concrete

Journal of Building Material Science ◽

10.30564/jbms.v2i1.2731 ◽

2021 ◽

Vol 2 (1) ◽

Author(s):

Anthony Torres ◽

Federico Aguayo ◽

Srinivas Allena ◽

Michael Ellis

Keyword(s):

Compressive Strength ◽

Fresh Concrete ◽

High Strength ◽

Reactive Powder Concrete ◽

Chemical Admixture ◽

Lower Viscosity ◽

Reactive Powder ◽

The Impact ◽

Polycarboxylate Ether ◽

High Range

A superplasticizer is a type of chemical admixture used to alter the workability (viscosity) of fresh concrete. The workability of fresh concrete is often of particular importance when the water-to-cement (w/c) ratio is low and a particular workability is desired. Reactive Powder Concrete (RPC) is a high-strength concrete formulated to provide compressive strengths exceeding 130MPa and made of primarily powders. RPC materials typically have a very low w/c, which requires the use of a chemical admixture in order to make the material workable for placing, handling and consolidating. Superplasticizer are commonly used for this purpose. Superplasticizers are developed from different formulations, the most common being Polynaphthalene Sulfonate (PNS), Polymelamine Sulfonate (PMS) and Polycarboxylate Ether (PCE). This study investigates the impact of various PNS based superplasticizers on the compressive strength and rheological performance of a RPC mixture. Six different types of PNS based superplasticizers were used; three of various compositional strengths (high, medium, low range) from a local provider, and three of the same compositional strengths (high, medium, low) from a leading manufacturer. Specific properties assessed were the superplasticizers viscosity, concrete workability through the mortar-spread test, concrete rheology, and 7, 14, and 28 day RPC compressive strengths. Two mixtures were produced with two w/cm (0.20 and 0.15), which would subsequently increase the amount of superplasticizer needed, from 34.7L/m3 to 44.5L/m3. The results show that the name brand high range composition produced the overall highest spread, lowest viscosity, and a highest compressive strength at all ages tested. However, the local provider outperformed the name brand in the mid and low range compositions. Additionally, the rheology test also demonstrated that the name brand high range, and RPC produced with the name brand high range, had a lower viscosity at all angular speeds than the others tested.

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An Experimental work on Reactive Powder Concrete using Quartz Sand and Metakaolin

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.d1136.029420 ◽

2020 ◽

Vol 9 (4) ◽

pp. 107-110

Keyword(s):

Quartz Sand ◽

Coarse Aggregate ◽

Reactive Powder Concrete ◽

Fine Aggregate ◽

Trial And Error ◽

Split Tensile Strength ◽

Trial And Error Method ◽

Reactive Powder ◽

Error Method ◽

Precise Degree

Reactive Powder Concrete is a Concrete which does not have fine &coarse aggregate in it. It is due to the high cost in coarse aggregate and at the same time scarcity of the fine aggregate. RPC is also consists of fully a partially replacement of cement .so we are using partially replacement of cement. Where it is a special concrete and the microstructure is optimized by precise degree of all particles in the mix yield to maximum density. It consists of metakaolin, quartz-sand and cement. Here we are replacing coarse and fine aggregate by quartz-sand, and cement is partially replaced by metakaolin. And the percentage of meta kaolin is identified by trial and error method. In this we get the compressive, flexural & split tensile strength of RPC for 28 days

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Investigation on the Properties of Sustainable Reactive Powder Concrete by Utilization of Coir Pith Aggregates and Pyrogenic Silica

10.21203/rs.3.rs-378630/v1 ◽

2021 ◽

Author(s):

Oorkalan A ◽

Chithra S

Keyword(s):

Silica Fume ◽

Low Cost ◽

Autogenous Shrinkage ◽

Drying Shrinkage ◽

Particle Packing ◽

Reactive Powder Concrete ◽

Fine Aggregate ◽

Coir Pith ◽

Pyrogenic Silica ◽

Reactive Powder

Abstract The present study investigates the properties of RPC developed using low cost eco-friendly materials such as pyrogenic silica (PS) and coir pith (CP) fine aggregates. This study investigates the effects of PS as silica fume replacement which is the main constituent for the production of reactive powder concrete which contained coir pith as a fine aggregate replacement instead of quartz sand up to 25%. The use of silica fume increases the particle packing density of RPC but increases the shrinkage phenomenon in RPC due to the minimum w/b ratio adopted. Therefore, in this research PS is used as a partial substitute for SF up to 30% and its effect on the mechanical and durability properties of coir pith containing RPC is studied. The test results showed that the mechanical strength values decreased with an increase in the addition of CP aggregate beyond 5% whereas the decrement in compressive strength was partially reduced when PS is used as silica fume replacement up to a maximum of 30%. The chloride penetration resistance was also improved with increasing PS substitution in RPC containing CP aggregates. The autogenous shrinkage and drying shrinkage were also significantly reduced due to the internal curing ability of the CP aggregates in combination with PS. The development of dense CSH gels from hydration is also evident from low CaO/ SiO2 ratio obtained from the EDS analysis. Hence the combination of PS with CP aggregates can reduce the shrinkage characteristics of RPC thereby providing eco-friendly sustainable concrete at low cost.

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Irradiation Duration Effect of Gamma Ray on the Compressive Strength of Reactive Powder Concrete

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.857.15 ◽

2020 ◽

Vol 857 ◽

pp. 15-21

Author(s):

Nesreen B. Najib ◽

Shatha D. Mohammed ◽

Wasan Z. Majeed ◽

Nada Mahdi Fawzi A. Jalawi

Keyword(s):

Compressive Strength ◽

Fiber Volume Fraction ◽

Gamma Ray ◽

Volume Fraction ◽

Reactive Powder Concrete ◽

Fiber Volume ◽

Gamma Ray Irradiation ◽

Duration Effect ◽

Reactive Powder ◽

The Impact

Reactive Powder Concrete (RPC) could be considered as the furthermost significant modern high compressive strength concrete. In this study, an experimental investigation on the impact of micro steel fiber volume fraction ratio and gamma ray irradiation duration influence upon the compressive strength of RPC is presented. Three volume fraction ratios (0.0, 1.0 and 1.5) % was implemented. For each percentage of the adopted fiber ratios, six different irradiation duration was considered; these are (1, 2, 3, 4, 5 and 6) days. Gamma source (Cs-137) of energy (0.662) MeV and activity (6) mci was used. In a case of zero volume fraction ratio, the experimental results showed that gamma ray had a significant influence on the reducing of the compressive strength varies between (1.2-8.6)% for a period of (1-6) days, respectively. Although there was a decrease in the compressive strength for a state of non-zero volume fraction ratio (1 and 1.5) % varies between (1.0-3.1 and 0.4-1.6) %, respectively, the attained results indicated that gamma ray had no significant effect to reduce the compressive strength of the RPC that’s included micro steel fibers as a volume fraction.

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Effect of maximum grain size on value of modulus of rupture reactive powder concrete

MEDIA KOMUNIKASI TEKNIK SIPIL ◽

10.14710/mkts.v26i1.25088 ◽

2020 ◽

Vol 26 (1) ◽

pp. 1-8

Author(s):

Widodo Kushartomo ◽

Dewi Linggasari ◽

Arianti Sutandi

Keyword(s):

Concrete Beam ◽

Aggregate Size ◽

Modulus Of Rupture ◽

Reactive Powder Concrete ◽

Fine Aggregate ◽

Steam Curing ◽

Cement Ratio ◽

Water Cement Ratio ◽

Buckling Failure ◽

Reactive Powder

Modulus of rupture (R) is a measurement of a tensile strengh of a concrete beam. The value of R is affected by the size of fine aggregat grain, the density of the concrete beam and the water-cement ratio. The unit of R is MPa expressing the tensile strength of the concrete beam without reinforcement to withstand a buckling failure. The distance between the supports of the concrete beam should not be less than three times of the height of the beam. In this research the size of the concrete beam speciment was 100 mm x 100 mm x 350 mm, the maximum fine aggregate size was varied (300 µm, 425 µm, and 600 µm) and the water-cement ratio was also varied (0.25, 0.22 and 0,20). All speciments were cured by steam curing and were tested after seven days. The results show that the larger the size of the fine aggregat grain and the higher the water-cement ratio, the smaller the R.

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Study on Low-Cost Reactive Powder Concrete and its Application

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.405-406.62 ◽

2009 ◽

Vol 405-406 ◽

pp. 62-68

Author(s):

Ming Zhang ◽

Feng Xing ◽

Liang Peng Deng ◽

Zheng Liang Cao ◽

Zhan Huang

Keyword(s):

Compressive Strength ◽

Fly Ash ◽

Quartz Sand ◽

Large Scale ◽

Low Cost ◽

Reactive Powder Concrete ◽

Fine Aggregate ◽

Complex Procedure ◽

Reactive Powder ◽

Very High

Reactive powder concrete (RPC) is a new kind of material with very high mechanical behavior and durability, however, high cost and complex procedure to make RPC result in hardly apply to engineering in large scale. a new low-cost RPC that compressive strength exceeds 130MPa was prepared with the replacement of quartz sand, crushed quartz and partial of silica fume by fly ash, slag and natural fine aggregate in the paper. Manhole cover that made from the low-cost RPC can meets the requirements of different situations, such as special road, motorway, etc.

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Strength optimization of reactive powder concrete

Revista IBRACON de Estruturas e Materiais ◽

10.1590/s1983-41952020000500007 ◽

2020 ◽

Vol 13 (5) ◽

Author(s):

Abrahão Bernardo Rohden ◽

Ana Paula Kirchheim ◽

Denise Dal Molin

Keyword(s):

Compressive Strength ◽

Aggregate Size ◽

Reactive Powder Concrete ◽

Maximum Aggregate Size ◽

Second Phase ◽

Fine Aggregate ◽

Inorganic Pigments ◽

Concrete Mix Design ◽

Fine Quartz ◽

Reactive Powder

abstract: Recent reports on reactive powder concrete address important aspects regarding its performance. Several techniques are used to improve the design of such concretes. Ultra-high compressive strengths have been reported with the application of pre-setting pressure and autoclave curing. The objective of this work is to evaluate the use of very fine quartz powder to replace fine aggregate, nanosilica, and inorganic pigments to optimize mechanical properties of reactive powder concrete. The experimental work was developed in three distinct phases. In the first phase, mix-proportions of reactive powder concrete have been developed, considering different maximum aggregate sizes (1.2, 0.6, 0.075, and 0.045 mm). In the second phase, the influence of nanosilica on the properties of reactive powder concrete was evaluated. In the third phase, the effect of the addition of yellow, green, orange, and blue inorganic pigments to the reactive powder concrete mix-design was evaluated. Results show that the maximum aggregate size influences the compressive strength of the reactive powder concrete. A decrease from 1.2 mm to 0.045 mm in the maximum aggregate size resulted in 156 MPa increase in the compressive strength. The type of pigment did not significantly influence the compressive strength of the reactive powder concrete. The mix-proportion that resulted in the highest compressive strength (310.7 MPa) was designed using yellow pigment.

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