Influence of Waste Crushed Limestone and Waste Micronized Marble Powder on Mechanical Properties of Cement Composite

2016 ◽  
Vol 722 ◽  
pp. 222-227 ◽  
Author(s):  
Zdeněk Prošek ◽  
Jaroslav Topič ◽  
Karel Šeps ◽  
Pavel Tesárek
Keyword(s):  
Mechanical Properties ◽  
Dynamic Modulus ◽  
High Speed ◽  
Cement Composite ◽  
Dynamic Shear Modulus ◽  
Dynamic Shear ◽  
Binding Properties ◽  
Marble Powder ◽  
Crushed Limestone ◽  
Marble Sludge

For production of the samples were used several types of aggregate: the standard sand from Zalezlice, the standard sand from Gaza, waste crushed limestone, waste marble sludge and waste micronized marble powder. The Portland cement CEM I 42.5 R produced in Radotín was used as binder. Testing was carried at prismatic samples of dimension 40 × 40 × 160 mm. Another approach than previously used solutions consists primarily in micronization marble sludge with a high-speed mill, this modified micronized filler may also an impact on the final properties of composite materials based on cement. The micronized powder may have binding properties that are activated in this way. Dynamic modulus of elasticity, dynamic shear modulus, flexural strength and compressive strength were determined for the 28 days old samples.

The Effect of Micronized Waste Marble Powder as Partial Replacement for Cement on Resulting Mechanical Properties of Cement Pastes

2017 ◽  
Vol 1144 ◽  
pp. 54-58
Author(s):  
Zdeněk Prošek ◽  
Karel Šeps ◽  
Jaroslav Topič
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Reference Material ◽  
Dynamic Modulus ◽  
Blended Cement ◽  
Partial Replacement ◽  
Dynamic Shear Modulus ◽  
Dynamic Shear ◽  
Cement Pastes ◽  
Marble Powder

This article was focused on the influence of the micronized waste marble powder on mechanical properties of cement pastes. Resulting blended cement was composed of Portland cement CEM I 42.5 R and micronized marble powder with different percentage amounts (0 wt. %, 5 wt. %, 10 wt. % and 15 wt. %). Testing was carried at prismatic samples of dimension 40 × 40 × 160 mm. The investigated mechanical properties were dynamic modulus of elasticity, dynamic shear modulus, flexural strength and compressive strength for the 28 days old samples. The results obtained from these materials were compared with reference material.

Shrinkage of Cement Composite with Material Based on Waste Marble and Limestone

2017 ◽  
Vol 731 ◽  
pp. 80-85
Author(s):  
Lukáš Hlubocký ◽  
Zdeněk Prošek
Keyword(s):  
High Speed ◽  
Cement Composite ◽  
Limestone Powder ◽  
Cement Ratio ◽  
Fraction Size ◽  
High Speed Grinding ◽  
Marble Powder ◽  
The Difference ◽  
Crushed Limestone ◽  
Marble Sludge

The article deals with the shrinkage of a cement composite with various contents of waste micronized limestone powder with a fraction size of 0-63 μm and crushed limestone with a fraction size of 0-2 mm. Waste micronized powder is produced by high-speed grinding of marble sludge. The difference in shrinkage of various mixtures has been described by means of structural analysis. Electron microscopy has been used for this analysis. Mixtures with 10 wt. % of cement and various ratios of micronized marble powder to crushed limestone (1: 1; 1: 2; 2: 1; 1: 0) were investigated. The increasing amount of waste micronized powder adversely affects the shrinkage of the cement composite. This effect is caused by the increasing water–cement ratio for the purpose of achieving the same workability of the mixture.

Mechanical Properties of Cement Composite with Material Based on Waste Marble Powder and Crushed Limestone

2017 ◽  
Vol 1144 ◽  
pp. 9-13
Author(s):  
Lukáš Hlubocký ◽  
Zdeněk Prošek
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Portland Cement ◽  
Construction Industry ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Cement Composite ◽  
Waste Materials ◽  
Marble Powder ◽  
Crushed Limestone

This paper deals with the use of waste materials from processing of stone in the construction industry. The tested mixtures consisted of Portland cement CEM I 42.5 R, micronized waste marble powder and crushed waste limestone. The article examines the effect of varying the amount of waste on the mechanical properties of the cement composite. At first, samples were tested non-destructively for determine the dynamic modulus of elasticity and then were tested destructively for determine tensile bending and compressive strength.

scholarly journals LONG-TIME INVESTIGATION OF CEMENT COMPOSITE MATERIAL WITH MICRONIZED WASTE MARBLE POWDER: DYNAMIC MODULES

2017 ◽  
Vol 13 ◽  
pp. 93
Author(s):  
Zdeněk Prošek ◽  
Jaroslav Topič
Keyword(s):  
Shear Modulus ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Blended Cement ◽  
Resonance Method ◽  
Partial Replacement ◽  
Dynamic Shear Modulus ◽  
Dynamic Shear ◽  
Dynamic Modulus Of Elasticity ◽  
Marble Powder

This article focus on “blended cement”. The blended cement was created by using waste marble powder (WMP) as a partial replacement for cement. We investigated the influence of WMP on the developing of the dynamic modulus of elasticity and the dynamic shear modulus in time. Four different cement composites with WMP as a partial replacement for cement were studied (5, 10, 15 and 50 wt. %) together with reference samples. Dynamic modulus of elasticity was monitored during the first 377 days since manufacture by use of non-destructive testing (resonance method). The results showed that WMP in a small amount had a no effect on the dynamic modulus of elasticity and the dynamic shear modulus.

scholarly journals CEMENT MATRIX CONTAINING MICRONIZED RECYCLED CONCRETE AND THE INFLUENCE OF ADDITIVES

2018 ◽  
Vol 15 ◽  
pp. 20-24
Author(s):  
Jakub Ďureje ◽  
Zdeněk Prošek ◽  
Jaromír Hrůza ◽  
Pavel Tesárek
Keyword(s):  
Dynamic Modulus ◽  
Resonance Method ◽  
Cement Composite ◽  
Recycled Concrete ◽  
The Other ◽  
Cement Matrix ◽  
Dynamic Shear Modulus ◽  
Dynamic Shear ◽  
Reference Samples ◽  
Selection Of

The article deals with the selection of a suitable additives in cement composite material for the production of a masonry block. The blocks contains recycled concrete which replacing 40% cement. The recyclate comes from concrete drainage gutters. Based on previous measurements, two hardening accelerators and one superplasticizer were selected. To determine the effect of these additives on the recycled cement composite, pairs of samples sets were produced, of which one set contains concrete recyclate and the other one does not contain it. The dynamic modulus of elasticity and the dynamic shear modulus were measured by the resonance method at the age of samples 1, 7, 14, 21 and 28 days, and by an ultrasound method at 28 days of age. Then was measured compressive strength. All values were compared with the values measured on the reference samples.

The Dominant Factor Analysis of Dynamic Shear Modulus of Poplar LVL Based on Grey Theory

2010 ◽  
Vol 113-116 ◽  
pp. 811-814
Author(s):  
Feng Li ◽  
Ying Cheng Hu
Keyword(s):  
Mechanical Properties ◽  
Production Technology ◽  
Dominant Factor ◽  
Process Conditions ◽  
Dynamic Shear Modulus ◽  
Grey Theory ◽  
Dynamic Shear ◽  
Experimental Conditions ◽  
Laminated Veneer Lumber ◽  
Press Temperature

Wood is one kind of natural renewable eco-material. Laminated veneer lumber (LVL) is an engineered wood product made from veneers glued together with parallelly oriented grains under heat and pressure. This paper designed Poplar LVL production experiments under different process conditions, and measured the mechanical properties of poplar LVL specimens under different experimental conditions. In this study, grey theory was used to analyze the influences of different production processes on the mechanical properties, such as press duration, press temperature, pressure and adhesive spread. The results showed that, it is feasible that grey theory is used to analyze the influence level of production technology of poplar LVL on the mechanical properties. So this paper offered a new method to analyze and design the production technology of LVL.

scholarly journals Experimental Study of the Engineering Mechanical Properties of the Foundation Soil for Offshore Wind Power Platforms

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Yi Fang ◽  
Yuejun Lv ◽  
XingYuan Zhou ◽  
Yanju Peng
Keyword(s):  
Mechanical Properties ◽  
Shear Modulus ◽  
Wind Power ◽  
Offshore Wind ◽  
Dynamic Shear Modulus ◽  
Silty Clay ◽  
Dynamic Shear ◽  
Foundation Soil ◽  
Offshore Wind Power ◽  
Geotechnical Tests

Most of the coastal beach zone in the world is rich in wind energy reserves and has great potential for offshore wind power development. However, the sedimentary environment in the coastal area is complex and changeable, and the nature of the foundation soil of offshore wind power platforms is weak and complex, which is quite different from that in the land areas. In order to systematically study the mechanical properties of marine foundation soils, a series of geotechnical tests are carried out on representative undisturbed seabed soils, such as basic laboratory geotechnical tests, bender element tests, undrained triaxial shear tests, and resonance column tests. The test results show that shear wave velocity (Vs) of marine silt and silty clay increases linearly with the buried depth; the stress-strain relationship curves of silty clay and silt present two different modes of development: strain hardening and strain softening, the undrained shear strength (Sd) of the two types of marine soils decreases with the increase of the void ratio (e), and both present a good single correlation. Based on the relationship between Sd and Vs from the laboratory test of disturbed seabed soils, an undrained strength evaluation method of undisturbed seabed soils under the current stratum conditions incorporating in situ shear wave velocity is established. The dynamic shear modulus (G) in the various strain ranges of undisturbed silty clay and silt increases regularly with the buried depth (H). Meanwhile, the maximum dynamic shear modulus (Gmax) linearly increases with the increase of H, whereas the attenuation relationship of G decreases with the increase of H. The prediction method of G based on buried depth is established with high accuracy.

scholarly journals RECYCLING AND ITS USE IN CONCRETE WASTE PROCESSING BY HIGH-SPEED MILLING

2019 ◽  
Vol 21 ◽  
pp. 28-32
Author(s):  
Zdeněk Prošek ◽  
Pavel Tesárek ◽  
Jan Trejbal
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Dynamic Modulus ◽  
High Speed ◽  
Milling Process ◽  
Partial Replacement ◽  
Waste Processing ◽  
Structural Concrete ◽  
High Speed Milling ◽  
Milling Method

This article discusses the possibility of recycling of concrete waste using the high-speed milling method. The resulting of milling is micronize old concrete. Used old concrete was created by crushing of old concrete, which served as a structural concrete for the construction of a supporting column. Two level of milling process was used to recycle old concrete. The main use of waste is the possibility of partial replacement of commonly used binder and microfillers in concrete. For this reason, properties as particle size distribution, dynamic modulus of elasticity, flexural strength and compressive strength were observed. The aim is to replace as much cement as possible while maintaining mechanical properties.

Development of Mechanical Properties of Cement Paste with Different Addition of Polyvinyl Alcohol

2015 ◽  
Vol 732 ◽  
pp. 81-84 ◽  
Author(s):  
Jaroslav Topič ◽  
Pavel Tesárek ◽  
Václav Nežerka ◽  
Zdeněk Prošek ◽  
Tomáš Plachy
Keyword(s):  
Mechanical Properties ◽  
Shear Modulus ◽  
Polyvinyl Alcohol ◽  
Cement Paste ◽  
Resonance Method ◽  
Dynamic Shear Modulus ◽  
Dynamic Shear ◽  
Alcohol Content ◽  
Dynamic Young’S Modulus ◽  
Dynamic Young's Modulus

This paper deals with using resonance method for determine the development of the mechanical properties of cement paste with different polyvinyl alcohol content. Main properties which were monitored are the dynamic Young’s modulus and dynamic shear modulus. Those properties were measured during 161 days for better understanding of influence of Polyvinyl Alcohol (PVA) added in the cement paste. Difference between this paper and already published articles is in several parameters. Main difference is that samples in this paper were cured on air, not in water. Moreover was used higher amount of polyvinyl alcohol on modification of cement paste.

Mechanical Properties of Gypsum Matrix Reinforced with Recycled Fibers

2016 ◽  
Vol 825 ◽  
pp. 3-6 ◽  
Author(s):  
Lukáš Hlubocký ◽  
Jaromír Hrůza ◽  
Lukas Novák ◽  
Jaroslav Topič
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Shear Modulus ◽  
Glass Fibers ◽  
Resonance Method ◽  
Steel Fibers ◽  
Dynamic Shear Modulus ◽  
Dynamic Shear ◽  
Metallic Reinforcement ◽  
Recycled Fibers

This paper deals with using resonance method for determine a development of mechanical properties of gypsum matrix reinforced with steel fibers from recycled tires. Mechanical properties which were monitored are the dynamic Young's modulus and dynamic shear modulus. Both properties were measured by a resonance method on samples 28 days old. The aim was to check the possibilities of using the recycled tires in construction as reinforcement to the gypsum binder. Many published papers deals with composite materials based on gypsum, but mainly with standard non-metallic reinforcement such as glass fibers, PP and PE fibers etc.

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