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 %.

The Development of the Fine-Aggregate Concrete Strength with Recycled Cement Powder

2016 ◽  
Vol 827 ◽  
pp. 255-258 ◽  
Author(s):  
Tereza Pavlů ◽  
Magdaléna Šefflová
Keyword(s):  
Mechanical Properties ◽  
Dynamic Modulus ◽  
Concrete Strength ◽  
Recycled Concrete ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Aggregate Concrete ◽  
Cement Powder ◽  
Concrete Mixtures ◽  
Partial Cement Replacement

This investigation was focused on possibility of use recycled cement powder originating from the construction and demolition concrete waste as partial replacement of cement in concrete mixture. The main goal of this paper is the study of the mechanical properties development of the fine-aggregate concrete with partial cement replacement at the age 7, 14 and 28 days. The compressive strength and dynamic modulus of elasticity were tested in time. The recycled cement powder from fine recycled concrete, which was used as partial replacement of cement, had the same grain size as cement. The concrete mixtures contained 95 %, 90 % and 85 % of cement and residue has been replaced by recycled cement powder. Mechanical properties were tested on cubic and prismatic specimens.

scholarly journals Degradation Resistance and Reliability Analysis of Recycled Aggregate Concrete in a Sulfate Environment

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Hui Cao ◽  
Lifeng Zhao ◽  
Chenggong Lu ◽  
Lijuan Guan ◽  
Hongxia Qiao ◽  
...  
Keyword(s):  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Coarse Aggregate ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Fine Aggregate ◽  
Aggregate Concrete ◽  
Recycled Coarse Aggregate ◽  
Recycled Fine Aggregate ◽  
Dynamic Modulus Of Elasticity

Resistance to sulfate degradation is an important index used to measure concrete’s durability. In this study, recycled aggregate concrete (RAC) with a 0%, 30%, and 50% recycled coarse aggregate substitution rate and a 0% and 15% recycled fine aggregate replacement rate was used as the research object, and its degradation resistance was evaluated by the mass loss rate and the relative dynamic modulus of elasticity. The degradation products were studied and analyzed with SEM scanning electron microscopy and XRD phase analysis. The relative dynamic modulus of elasticity was selected as the degradation index, the RAC concrete’s degradation resistance was modeled by Wiener, and the reliability curve was obtained. The results showed that expansion products, such as gypsum and Ettringite, were produced in RAC concrete in a dry-wet sulfate cycling environment, and such defects as pores and voids were filled in the initial stage. The stress the expansion products exerted in the later stage caused the concrete to crack and peel, which demonstrated that the fluctuation law of mass and the dynamic elastic modulus increased first and then decreased. The recycled coarse aggregate substitution ratio’s effect on RAC concrete is higher than that of recycled fine aggregate. The reliability curve established by the Wiener model can reflect the reliability of RAC concrete under different cycles well and can obtain RAC concrete’s sulfate degradation resistance life with different aggregate substitution rates.

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.

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).

Study Replacement of Cement with Recycled Cement Powder and the Environmental Assessment

2016 ◽  
Vol 249 ◽  
pp. 136-141 ◽  
Author(s):  
Tereza Pavlů ◽  
Vladimír Kočí ◽  
Magdaléna Šefflová
Keyword(s):  
Environmental Assessment ◽  
Life Cycle Analysis ◽  
Mechanical Deformation ◽  
Recycled Aggregate ◽  
Concrete Mixture ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Aggregate Concrete ◽  
Cement Powder ◽  
Partial Cement Replacement

This investigation is focused on possibility of partial cement replacement in concrete mixture and its environmental assessment. The cement in concrete mixture is replaced by recycled cement powder from modified construction and demolition (C&D) waste. Recycled cement powder were prepared in laboratory from C&D waste of high quality road concrete. The main goal of this investigation is optimize amount of recycled cement powder used as partial replacement of cement in concrete mixture according to mechanical, deformation and physical properties of concrete and environmental impact. The properties of the fine-aggregate concrete with partial replacement of cement by recycled cement powder were tested for this verification. The life cycle analysis was calculated for this optimization. The properties and environmental assessment of the fine-aggregate concrete with partial replacement of fine aggregate by fine recycled aggregate were examined for comparison.

Non Destructive Testing of Concrete with Recycled Cement Powder

2016 ◽  
Vol 825 ◽  
pp. 45-48 ◽  
Author(s):  
Tereza Pavlů ◽  
Magdaléna Šefflová
Keyword(s):  
Physical Properties ◽  
Water Absorption ◽  
Absorption Capacity ◽  
Recycled Concrete ◽  
Construction And Demolition Waste ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Demolition Waste ◽  
Aggregate Concrete ◽  
Cement Powder

This study deals with determination of the physical properties of fine-aggregate concrete with partial replacement of cement in concrete mixture. Cement was replaced by recycled cement powder originating from construction and demolition waste. The main goal of this study is evaluation of the basic physical properties of the fine-aggregate concrete with partial cement replacement by recycled concrete powder such as density, water absorption capacity and capillary water absorption. The fine recycled concrete which was used as partial replacement of cement had the same grain size as cement. The replacement rate was 0 %, 5 %, 10 % and 15 %. Physical properties were investigated by using cubic and prismatic specimens.

scholarly journals Temperature dependence of dynamic and static modulus of elasticity of lightweight expanded clay aggregate concrete

2021 ◽  
Vol 2094 (4) ◽  
pp. 042052
Author(s):  
M A Medvedev ◽  
A M Cherkasov ◽  
E V Tararushkin
Keyword(s):  
Temperature Dependence ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Lightweight Concrete ◽  
Testing Machine ◽  
Asphalt Mixture ◽  
Aggregate Concrete ◽  
Static Modulus ◽  
Dynamic Modulus Of Elasticity ◽  
Static Modulus Of Elasticity

Abstract The paper presents experimental research the static and dynamic modulus of elasticity of lightweight expanded clay aggregate concrete with averaged density of 1000 kg/m3. The static and dynamic modulus are obtained depending on the influence of temperature in the range from 5 to 50 °C with a step of 15 °C. The dynamic modulus was determined without pre-compression with a testing machine Asphalt Mixture Performance Tester. Besides the modulus of elasticity of lightweight concrete, the temperature dependence of unconfined compressive strength was also determined. Analysis of experimental data showed that with an increase in temperature, strength and modulus of elasticity slightly decrease, which is typical for concretes. For all cases, the temperature dependence can be characterized according to the linear law. Comparison of the static and dynamic modulus of elasticity showed that the dynamic modulus is 60-74% greater than the static modulus over the entire range of the studied temperatures.

The Static and the Dynamic Modulus of Elasticity of Recycled Aggregate Concrete

2014 ◽  
Vol 1054 ◽  
pp. 221-226 ◽  
Author(s):  
Tereza Pavlů ◽  
Magdaléna Šefflová
Keyword(s):  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Negative Impact ◽  
Recycled Concrete ◽  
Recycled Aggregate Concrete ◽  
Construction And Demolition Waste ◽  
Recycled Aggregate ◽  
Demolition Waste ◽  
Aggregate Concrete ◽  
Dynamic Modulus Of Elasticity

The main aim of this contribution is description of the static and the dynamic modulus of elasticity of concrete containing recycled aggregate. Recycled construction and demolition waste, especially recycled concrete, is able to use as an aggregate for concrete, but using of recycled aggregate has a negative impact of concrete characteristic. This paper presents results of non-destructive measurement of recycled aggregate concrete properties. Series of concrete samples with 100% replacement ratios of coarse natural aggregate by coarse recycled aggregate from different sources were prepared for this study. The static and the dynamic modulus of elasticity were investigated on specimens 100 x 100 x 400 mm. All tested mixtures were also tested on compressive strength.

Correlation Analysis of Evaluation Indexes for Freeze-Thaw Damage of Lightweight Aggregate Concrete

2010 ◽  
Vol 452-453 ◽  
pp. 657-660
Author(s):  
Ji Ze Mao ◽  
Zong Min Liu ◽  
Koichi Ayuta ◽  
Wan Jie Yin
Keyword(s):  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Concrete Durability ◽  
Freezing And Thawing ◽  
Aggregate Concrete ◽  
Evaluation Indexes ◽  
Freeze Thaw ◽  
Dynamic Modulus Of Elasticity

Freeze-thaw damage is one of the most representative damages in concrete durability. In this study, rapid freezing and thawing tests were conducted to investigate the freeze-thaw resistance and analyze the correlation of the evaluation indexes of lightweight aggregate concrete with different water-cement ratios. The high correlation was confirmed between the length change and relative dynamic modulus of elasticity of lightweight aggregate concrete. The relative dynamic modulus of elasticity decreased with the increase of concrete length. However, the correlation was different according to the water-cement ratio values of lightweight aggregate concrete. The higher water-cement ratios, the lower expansion values of lightweight aggregate concrete when the relative dynamic modulus of elasticity decreased to the same degree under freezing and thawing action.

Sign in / Sign up

Export Citation Format

Share Document