Mechanical properties and microstructure of High-Performance Concrete with bamboo leaf ash as additive

Due to the sharp and corrosion-prone features of steel fibers, there is a demand for ultra-high-performance concrete (UHPC) reinforced with nonmetallic fibers. In this paper, glass fiber (GF) and the high-performance polypropylene (HPP) fiber were selected to prepare UHPC, and the effects of different fibers on the compressive, tensile and bending properties of UHPC were investigated, experimentally and numerically. Then, the damage evolution of UHPC was further studied numerically, adopting the concrete damaged plasticity (CDP) model. The difference between the simulation values and experimental values was within 5.0%, verifying the reliability of the numerical model. The results indicate that 2.0% fiber content in UHPC provides better mechanical properties. In addition, the glass fiber was more significant in strengthening the effect. Compared with HPP-UHPC, the compressive, tensile and flexural strength of GF-UHPC increased by about 20%, 30% and 40%, respectively. However, the flexural toughness indexes I5, I10 and I20 of HPP-UHPC were about 1.2, 2.0 and 3.8 times those of GF-UHPC, respectively, showing that the toughening effect of the HPP fiber is better.

Download Full-text

Comparative Study of High-Performance Concrete Characteristics and Loading Test of Pretensioned Experimental Beams

Crystals ◽

10.3390/cryst11040427 ◽

2021 ◽

Vol 11 (4) ◽

pp. 427

Author(s):

Pavlina Mateckova ◽

Vlastimil Bilek ◽

Oldrich Sucharda

Keyword(s):

Mechanical Properties ◽

High Performance ◽

High Performance Concrete ◽

Raw Materials ◽

Load Capacity ◽

Materials Testing ◽

Loading Test ◽

Conventional Concrete ◽

Concrete Mechanical Properties ◽

Normal Strength

High-performance concrete (HPC) is subjected to wide attention in current research. Many research tasks are focused on laboratory testing of concrete mechanical properties with specific raw materials, where a mixture is prepared in a relatively small amount in ideal conditions. The wider utilization of HPC is connected, among other things, with its utilization in the construction industry. The paper presents two variants of HPC which were developed by modification of ordinary concrete used by a precast company for pretensioned bridge beams. The presented variants were produced in industrial conditions using common raw materials. Testing and comparison of basic mechanical properties are complemented with specialized tests of the resistance to chloride penetration. Tentative expenses for normal strength concrete (NSC) and HPC are compared. The research program was accomplished with a loading test of model experimental pretensioned beams with a length of 7 m made of ordinarily used concrete and one variant of HPC. The aim of the loading test was to determine the load–deformation diagrams and verify the design code load capacity calculation method. Overall, the article summarizes the possible benefits of using HPC compared to conventional concrete.

Download Full-text

Effect of metakaolin quantity on the mechanical properties of high-performance concrete

Progress in Civil, Architectural and Hydraulic Engineering IV ◽

10.1201/b19383-198 ◽

2015 ◽

pp. 961-964

Author(s):

HongBin Liu ◽

KaiLu Xiao ◽

WeiQi Tang ◽

WeiZhe Ma ◽

ZhengQi Shi ◽

...

Keyword(s):

Mechanical Properties ◽

High Performance ◽

High Performance Concrete

Download Full-text

Application of Nano-silica Particles to Improve the Mechanical Properties of High Performance Concrete Containing Superabsorbent Polymers

3rd International Conference on the Application of Superabsorbent Polymers (SAP) and Other New Admixtures Towards Smart Concrete - RILEM Bookseries ◽

10.1007/978-3-030-33342-3_23 ◽

2019 ◽

pp. 211-221 ◽

Cited By ~ 1

Author(s):

Thyala A. Cunha ◽

Lívia B. Agostinho ◽

Eugênia F. Silva

Keyword(s):

Mechanical Properties ◽

High Performance ◽

High Performance Concrete ◽

Silica Particles ◽

Nano Silica ◽

Superabsorbent Polymers

Download Full-text

Evaluation of Mechanical Properties on High Performance Concrete using Steel Fibres

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/822/1/012021 ◽

2021 ◽

Vol 822 (1) ◽

pp. 012021

Author(s):

B K Shruthi

Keyword(s):

Mechanical Properties ◽

High Performance ◽

High Performance Concrete ◽

Steel Fibres

Download Full-text

Influence of curing temperature on the mechanical properties of high-performance concrete

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/583/1/012011 ◽

2019 ◽

Vol 583 ◽

pp. 012011

Author(s):

J Fladr ◽

I Broukalova

Keyword(s):

Mechanical Properties ◽

High Performance ◽

High Performance Concrete ◽

Curing Temperature

Download Full-text

The Effect of Homogenization Procedure on Mechanical Properties of High-Performance Concrete with Partial Replacement of Cement by Supplementary Cementitious Materials

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.292.102 ◽

2019 ◽

Vol 292 ◽

pp. 102-107 ◽

Cited By ~ 2

Author(s):

Josef Fládr ◽

Petr Bílý ◽

Karel Šeps ◽

Roman Chylík ◽

Vladimír Hrbek

Keyword(s):

Mechanical Properties ◽

Fly Ash ◽

Water Content ◽

High Performance ◽

High Performance Concrete ◽

Cementitious Materials ◽

Supplementary Cementitious Materials ◽

Partial Replacement ◽

Depth Of Penetration ◽

Cement Additive

High-performance concrete is a very specific type of concrete. Its production is sensitive to both the quality of compounds used and the order of addition of particular compounds during the homogenization process. The mechanical properties were observed for four dosing procedures of each of the three tested concrete mixtures. The four dosing procedures were identical for the three mixes. The three mixes varied only in the type of supplementary cementitious material used and in water content. The water content difference was caused by variable k-value of particular additives. The water-to-binder ratio was kept constant for all the concretes. The additives used were metakaolin, fly ash and microsilica. The comparison of particular dosing procedures was carried out on the values of basic mechanical properties of concrete. The paper compares compressive strength and depth of penetration of water under pressure. Besides the comparsion of macro-mechanical properties, the effect of microsilica and fly ash additives on micro-mechanical properties was observed with the use of scanning electron microscopy (SEM) and nanoindentation data analysis. Nanoindentation was used to determine the thickness and strength of interfacial transition zone (ITZ) for different sequence of addition of cement, additive and aggregate. The thickness obtained by nanoindentation was further investigated by SEM EDS line scanning.

Download Full-text