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.

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.

A Method for Estimating the Dynamic Moduli of Cement Paste-Aggregate Interfacial Zones in Mortar

1994 ◽  
Vol 370 ◽  
Author(s):  
Menashi D. Cohen ◽  
Turng-Fang F. Lee ◽  
Ariel Goldman
Keyword(s):  
Portland Cement ◽  
Silica Fume ◽  
Cement Paste ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Dynamic Shear Modulus ◽  
Interfacial Zone ◽  
Dynamic Moduli ◽  
Dynamic Modulus Of Elasticity ◽  
Cement Mortars

AbstractThe objective of this paper is to propose a method to estimate the average values of the dynamic modulus of elasticity and the dynamic shear modulus of cement paste-aggregate interfacial zones in mortar by applying the Logarithmic Mixture Rule (LMR). Both portland cement mortars (PC mortars) and portland cement mortars with silica fume (SF mortars) are investigated and compared, The influence of silica fume on the dynamic moduli of interfacial zone is also examined. Results indicate that for the specific ingredients and mix design used, the dynamic modulus of elasticity of interfacial zone falls between 0.4 and 2.0 (×10 6 psi) for PC mortar and 1.2 to 2.2 (× 106 psi) for SF mortar. These values are lower than the values obtained for PC mortar (4.2 ×106 psi), PC paste (2.7 ×106 psi), SF mortar (4.4 ×106 psi), and SF paste (2.5 × 106 psi).

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.

The Properties of Fine-Aggregate Concrete with Recycled Cement Powder

2016 ◽  
Vol 677 ◽  
pp. 292-297 ◽  
Author(s):  
Tereza Pavlů ◽  
Magdaléna Šefflová ◽  
Vladimír Hujer
Keyword(s):  
Cement Paste ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Fresh Concrete ◽  
Partial Replacement ◽  
Strength Development ◽  
Fine Aggregate ◽  
Aggregate Concrete ◽  
Cement Powder ◽  
Dynamic Modulus Of Elasticity

The main aim of this contribution is verification of properties of concrete with partial replacement of cement by recycled cement powder originating from waste concrete. The main topic of this article is the study of influence of partial replacement of cement by recycled cement powder (RCP) to the cement paste properties, workability of fresh concrete and strength development and dynamic modulus of elasticity of fine aggregate concrete with partial replacement of cement. The workability of fresh concrete were tested by flow table test. The compressive strength, tensile strength in bending and dynamic modulus of elasticity were tested at the age 7, 14, 28 and 90 days. Partial replacement of cement was 0, 5, 10 and 15 % for all these tests. Mechanical properties were investigated by using cubic and prismatic specimens. The determination of the initial setting time of cement paste were measured by automatic Vicat apparatus for replacement rate of cement 0, 5, 10, 15 and 25 %.

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.

scholarly journals Experimental Investigation of Material Properties and Self-Healing Ability in a Blended Cement Mortar with Blast Furnace Slag

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2564
Author(s):  
Seunghyun Na ◽  
Wenyan Zhang ◽  
Madoka Taniguchi ◽  
Nguyen Xuan Quy ◽  
Yukio Hama
Keyword(s):  
Mechanical Properties ◽  
Material Properties ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Blended Cement ◽  
Self Healing ◽  
Replacement Ratio ◽  
Dynamic Modulus Of Elasticity ◽  
Different Types ◽  
Furnace Slag

This paper presents the results of an experimental investigation on the material properties and self-healing ability of a blended cement mortar incorporating blast furnace slag (BFS). The effect of different types and Blaine fineness of BFS on the material properties and self-healing was investigated. Thirteen cement mixtures with BFS of different types and degrees of Blaine fineness are tested to evaluate the mechanical properties, namely compressive strength, bending strength, freeze–thaw, and accelerated carbonation. The pore structure is examined by means of mercury intrusion porosimetry. Seven blended mortar mixtures incorporating BFS for cement are used to evaluate the mechanical properties after applying freeze–thaw cycles until the relative dynamic modulus of elasticity reached 60%. The experimental results reveal that incorporating BFS improves the mechanical properties and self-healing ability. In the investigation of self-healing, smaller particle and high replacement ratios of BFS contribute to increasing the relative dynamic modulus of elasticity and decreasing the carbonation coefficient in the mortar after re-water curing. Moreover, BFS’s larger particles and high replacement ratio are found to provide better self-healing ability. A regression equation is created to predict the relative dynamic modulus of elasticity in mortar considering the Blaine fineness, BFS replacement ratio, and curing conditions.

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.

scholarly journals Response of Refractory Cement Based Composite to Gradual Temperature Loading

2018 ◽  
Author(s):  
Ondřej Holčapek ◽  
Jaroslava Koťátková ◽  
Petr Konvalinka ◽  
Pavel Reiterman
Keyword(s):  
Flexural Strength ◽  
Fracture Energy ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Thermal Loading ◽  
Refractory Concrete ◽  
Partial Replacement ◽  
Additional Increase ◽  
Mechanical Fracture ◽  
Dynamic Modulus Of Elasticity

This paper deals with the experimental study of the response of refractory concrete mixture to gradual thermal loading, up to 1000 °C. A binding system based on calcium aluminate cement (CAC) modified by the partial replacement of metakaolin was used. Short ceramic fibers were applied in a dose of 4% by volume in the studied mixture. Material transformations due to thermal loading were monitored in terms of residual mechanical, fracture and basic physical properties-compressive strength, flexural strength, fracture energy, dynamic modulus of elasticity, and bulk density in the study. The results obtained corresponded well with the mineral transformations monitored using the thermogravimetric analysis performed on the binder paste. Residual values of compressive and flexural strength were approximately 40% of the initial values after exposure to a temperature of 1000°C; however, the dominant part of the total loss was monitored up to 400°C, due to decomposition of the hydrates. Fiber employment contributed considerably to the resistance against thermal loading up to 400°C, which was demonstrated by the fracture energy results (a loss of 25% was monitored). An additional increase of the temperature load led to micro crack propagation, which was obvious in the results of dynamic modulus of elasticity determination, in which the short fiber incorporation was noticeably limited.

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.

Sign in / Sign up

Export Citation Format

Share Document