Mechanical Behavior of Gypsum and Cork Based Composite Material

2012 ◽  
Vol 730-732 ◽  
pp. 361-366 ◽  
Author(s):  
Graca Vasconcelos ◽  
Andreia Martins ◽  
Sandra Cunha ◽  
Aires Camões ◽  
Paulo B. Lourenço
Keyword(s):  
Composite Material ◽  
Mechanical Characterization ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Raw Material ◽  
Engineering Construction ◽  
Fgd Gypsum ◽  
By Products

The main aim of this work is the mechanical characterization of a composite material resulting from the combination of three by-products coming from industry, namely, flue gas desulfurization (FGD) gypsum, granulated cork and textile fibers from tire recycling. The material is considered as a green material as the raw material are considered by-products and it is intended to be used as a building material for non-structural purposes in civil engineering construction. The mechanical characterization includes uniaxial compressive tests and bending tests for characterization of the fracture behavior. Additionally, ultrasonic pulse velocity is measured to evaluate its variation with time of curing.

Mechanical Characterization of Building Stones through DT and NDT Tests: Research of Correlations for the In Situ Analysis of Ancient Masonry

2014 ◽  
Vol 628 ◽  
pp. 85-89 ◽  
Author(s):  
Emilia Vasanelli ◽  
Maria Sileo ◽  
Giovanni Leucci ◽  
Angela Calia ◽  
Maria Antonietta Aiello ◽  
...  
Keyword(s):  
Mechanical Characterization ◽  
Diagnostic Procedures ◽  
Ultrasonic Pulse Velocity ◽  
Mechanical Analysis ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Reliable Technique ◽  
Non Destructive

In this paper, the use of ultrasonic pulse velocity (UPV) testing as a reliable technique to determine the compressive strength of a calcarenitic stone typical of Salento (South of Italy), known as Lecce Stone (LS) has been investigated. The scope of the experimental research is to establish correlations between the results obtained by non-destructive and destructive tests, in order to reduce the use of destructive methods within the diagnostic procedures for the mechanical analysis and qualification of ancient masonries. Furthermore, the presence of water as a variable affecting the test was investigated. The results of the tests show that the UPV values are well correlated with the compressive strengths and this method showed to be efficient in predicting the strength of LS.

scholarly journals Physical and mechanical characterization of concrete exposed to elevated temperatures by using ultrasonic pulse velocity

2015 ◽  
Author(s):  
Ricardo Alfredo Cruz-Hernández ◽  
◽  
Luis Eduardo Zapata-Orduz ◽  
Luz Amparo Quintero-Ortiz ◽  
Julián Orlando Herrera-Ortiz ◽  
...  
Keyword(s):  
Elevated Temperatures ◽  
Mechanical Characterization ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity

scholarly journals A Study on Tannery Sludge as a Raw Material for Cement Mortar

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1562 ◽  
Author(s):  
Jurgita Malaiškienė ◽  
Olga Kizinievič ◽  
Viktor Kizinievič
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Cement Mortar ◽  
Ultrasonic Pulse Velocity ◽  
Xrd Analysis ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Raw Material ◽  
Tannery Sludge ◽  
Limit Values

The paper analyses the properties (chemical and mineral composition, microstructure, density, etc.) of recycled tannery sludge (TS) and the possibilities for using it in cement mortar mixture. Mortar specimens containing 3–12% of tannery sludge by weight of cement and 3–9% of tannery sludge by weight of sand were tested. Flowability, density, ultrasonic pulse velocity (UPV), flexural and compressive strength, water absorption and sorptivity of the mortar were analysed. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis of tannery sludge and mortar are presented. The tests revealed that replacement of 6% of cement with tannery sludge in the mix increased flexural and compressive strength and UPV values, whereas water absorption decreased. SEM and XRD analysis revealed that specimens with tannery sludge contained lower amounts of ettringite and higher amounts of portlandite; the obtained structure was denser and contained more calcium hydrosilicates (C-S-H). Chromium leaching values in cement mortars were found not to exceed the limit values set forth in Directive 2003/33/EC.

scholarly journals Characterization of pervious concrete focusing on non-destructive testing

2020 ◽  
Vol 13 (3) ◽  
pp. 483-500 ◽  
Author(s):  
S. T. MARTINS FILHO ◽  
E. M. BOSQUESI ◽  
J. R. FABRO ◽  
R. PIERALISI
Keyword(s):  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Pervious Concrete ◽  
Analytical Models ◽  
High Porosity ◽  
Destructive Testing ◽  
Ultrasound Method ◽  
Lower Permeability

Abstract This study aims to investigate the properties of pervious concrete focusing on characterization tests by the Ultrasound Method. For this, three mixtures were produced with the paste/aggregate (P/Ag) ratio ranging from 0.45 to 0.65, water to cement ratio (w/c) of 0.3, and all the specimens were compacted with a steel rod. The application of the ultrasound method deserves special attention for the characterization of pervious concrete, due to a lack of research and the potential to develop analytical models for predicting properties from ultrasonic pulse velocity (UPV) as an independent variable. The UPV obtained in this study ranged from 3642 to 4262 m/s for an approximately 12% reduction in porosity, with a correlation (R²) of 0.91. It is noteworthy that the high porosity of pervious concrete causes attenuation of the ultrasonic wave. The measurements of UPV had higher values for specimens with higher densities (R²=0.87), higher compressive and tensile strengths (R² of 0.79 and 0.84, resp.), and lower permeability (R² = 0.91).

scholarly journals Aggregate suitability and Geo-chemical investigation of limestone for construction industries in Pakistan: An approach for economic development

2021 ◽  
Author(s):  
Asad Kamran ◽  
Liaqat Ali ◽  
Waqas Ahmed ◽  
Sobia Zoreen ◽  
Shah Jehan
Keyword(s):  
Compressive Strength ◽  
Uniaxial Compressive Strength ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Point Load ◽  
Load Test ◽  
Raw Material ◽  
Schmidt Hammer ◽  
Point Load Test

Abstract This study investigated the aggregate suitability and geo-chemical characteristics of limestone (LS) for construction industries. The results of aggregate parameters for different applications revealed that specific gravity (SG = 2.6), water absorption (WA = 0.47%), bulk density (BD = 1.58 g/cm3), flakiness index (FI = 16.8%), elongation index (EI = 16.39%), soundness (S = 1.6%), aggregate impact value (AIV = 14%), Los Angles Abrasion value (LAAV = 23.51%), clay lumps (CL = 0.35%), uniaxial compressive strength (UCS = 86.7 MPa), point load test (PLT = 5.18 MPa), ultrasonic pulse velocity (UPV = 5290 m/s) and Schmidt hammer rebound test (SHRT = 49 N) are in accordance with ASTM, ISRM and BSI. Petrographically, the LS is dominantly composed of ooids, peloids, bioclasts and calcite (CaCO3) with trace concentration of the dolomite. Geochemical results (n = 18) indicated that the LS is dominantly made up of calcite (95.81%); while on average it is composed of 52.08 wt.% CaO, 1.13 wt. % SiO2, 0.66 wt. %, MgO, 0.80 wt. % Al2O3, 0.76 wt. % Fe2O3 and LOI were recorded as 42.13 wt. %. Whereas, P2O5, TiO2, MnO, K2O and Na2O are found in trace amount. Regression analysis demonstrates that the empirical correlation equation for estimating uniaxial compressive strength with ultrasonic pulse velocity is more reliable than Schmidt hammer rebound test and point load test. The findings of this study strongly suggest LS of the area has a great potential as a raw material in construction industries.

scholarly journals Composite Binder Containing Industrial By-Products (FCCCw and PSw) and Nano SiO2

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1604
Author(s):  
Vilma Banevičienė ◽  
Jurgita Malaiškienė ◽  
Jiri Zach ◽  
Karel Dvorak
Keyword(s):  
Pore Diameter ◽  
Raw Materials ◽  
Physical And Mechanical Properties ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Average Pore ◽  
Nano Sio2 ◽  
Paper Manufacturing ◽  
By Products

This article analyzes the integrated effect of industrial by-products (spent fluidized bed catalytic cracking catalyst waste (FCCCw) and paper sludge waste (PSw) generated in paper manufacturing) combined with nano-SiO2 (NS) on the properties of cement binder, when a certain part of the binder is replaced with the said by-products in the cement mix. Standard testing methods were used to analyze the physical and mechanical properties of cement-based materials. For structure analysis, we used X-ray diffraction (XRD), derivative thermogravimetry (DTG), mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM). It was found that the replacement of cement by a combined additive of FCCCw, PSw and NS is important not only for ecological reasons (abatement of CO2 emissions and recovery of waste through secondary raw materials), but also in order to enhance the properties of cement-based binders. Presumably, higher amounts of calcium silicate hydrate (CSH) and calcium alumina silicate hydrate (CASH) in the compound binder are the result of the low content of portlandite and alite in the test specimens. The specimens modified with all three additives had the highest density (~2100 kg/m3), ultrasonic pulse velocity (UPV) (~4160 m/s) and compressive strength (~105 MPa), which was ~40% higher than in the control specimens. The average pore diameter of the complex binder decreased by 21%, whereas the median pore diameter decreased by 47%.

Characterization of Mortar with Mineral Additives

2013 ◽  
Vol 1612 ◽  
Author(s):  
M. R. Mejía Durán ◽  
A. A. Torres Acosta ◽  
M.G. Arroyo Contreras ◽  
M. Rendón Belmonte
Keyword(s):  
Electrical Resistivity ◽  
Previous Investigation ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Void Content ◽  
System Efficiency ◽  
Concrete Pile ◽  
Mineral Additives

ABSTRACTIt has been an increase on the number of concrete structures with corrosion induced damage in Mexico in recent years. It is also well known that cathodic protection (CP) is the only method that stops corrosion in an efficient way. Since the 1990’s Florida and other USA states have been installing in concrete pile substructures, in bridges and piers, a three part hybrid galvanic CP system. This hybrid galvanic CP system includes a thermal sprayed part (located at the aerial zone of the pile), a zinc mesh encapsulated in mortar and inside a glass fiber jacket (located at the change in ties zone), and a submerged zinc bulk anode (in the submerged zone). From a previous investigation performed by the present authors, it has been found that the mortar inside the fiberglass form may decrease the mesh anode activation and thus decrease the CP system efficiency. Therefore, this investigation includes an evaluation of different additions placed in mortar to increase its electrical and ionic conductivity to increase the efficiency of the entire hybrid system. Additions include carbon, zinc and alumina powders, and this investigation presents preliminary experimental results obtained from the tested mortars (i.e. mortar physical characterization: electrical resistivity, ultrasonic pulse velocity, and total void content).

Mechanical and Thermal Performances of Eco-Friendly Mortar Containing Recycled PET As Partial Sand Replacement

2021 ◽  
Author(s):  
Nacer Akkouri ◽  
Oumaima Bourzik ◽  
Khadija Baba ◽  
Bassam Tayeh
Keyword(s):  
Thermal Conductivity ◽  
Energy Efficient ◽  
Mechanical Performance ◽  
Construction Materials ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Raw Material ◽  
Recycled Pet ◽  
Potential Use

Abstract Plastic has become one of the most widely manufactured materials in the world and an indispensable part of everyday life. However, a large amount of plastic waste needs to be recycled to protect the environment. One way of recycling is to use such waste as a raw material substitute. This paper evaluates the thermal and mechanical performance of eco-friendly mortars containing 0%, 5%, 10%, 15% and 20% recycled polyethylene terephthalate (PET) particles as partial replacements for sand. Several experiments were conducted to evaluate the thermal properties (i.e. thermal conductivity, thermal diffusivity and heat capacity), compressive strength, density, workability and ultrasonic pulse velocity of these mortars. Results show that replacing sand with recycled PET in cement-based mortars reduces their thermal conductivity, thereby highlighting the potential use of these mortars as energy-efficient and environmentally friendly construction materials.

scholarly journals Alternate assessment of strength characteristics of clayey soil for compaction using ultrasonic pulse velocity method

2018 ◽  
Vol 7 (2.1) ◽  
pp. 15
Author(s):  
Vinay A ◽  
Dr A.V.Pradeepkumar ◽  
Dr M.R Rajashekhara
Keyword(s):  
Soil Properties ◽  
Water Content ◽  
Clayey Soil ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Engineering Construction ◽  
Compaction Curve ◽  
Method Of Assessment

Earthwork is a component in any Civil Engineering construction and to determination of soil properties in the laboratory is the basis of design. Clayey soils exhibits large volume changes in presence of water leads to swelling and shrinkage. Soils used for construction should satisfy two important properties like less settlement and more shear strength. Present investigation deals with the determination of compaction characteristics of clayey soil by an alternate method of assessment like pulse velocity method which is more accurate and fast compared to conventional methods. Laboratory compaction soil samples prepared at different water content by standard and modified proctor, compaction method was used to determine the ultrasonic pulse velocity at different water contents. The variation of velocity with respect to water content was correlated. Ultrasonic pulse transmitted from one side of the sample was received at the other end and was used in calculating soil properties. It was observed that with increase in water content the density increases and ultrasonic pulse velocity also increases. Standard proctor method of compaction and modified proctor moulds was used for compaction and 5 trails were done with variation in water content to get compaction curve, so as to find the variation of strength to stabilization and its variation by Ultrasonic pulse velocity technique.

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