scholarly journals Engineering Properties of Colorful Mortar with Inorganic Color Paste

2021 ◽  
Vol 11 (14) ◽  
pp. 6297
Author(s):  
Jhih-Ming Huang ◽  
Wein-Duo Yang ◽  
Her-Yung Wang ◽  
Tien-Chun Kao
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Surface Resistivity ◽  
Engineering Properties ◽  
Control Group ◽  
Slump Flow

Color cement directly exposes the surface of a concrete building through concrete materials or adding color additives and other technologies to achieve a special aesthetic effect of the overall building’s appearance. The multifunctionality of materials is paid increasing attention with time. This study uses additional 5%, 10% and 15% inorganic color paste and 20% polyacrylic emulsion to colorize mortar, and discusses the fresh properties (slump, slump flow), hardened properties (compressive strength, flexural strength, tensile strength and ultrasonic pulse velocity and durability (surface resistivity, thermal conductivity and length change) of mortar. The results show that the slump and slump flow increase with the content of inorganic color paste; the slump flow is larger than the control group and larger than 25 cm, meaning the inorganic color paste can effectively enhance the workability of mortar. The compressive strength, flexural strength and tensile strength decrease as the inorganic color paste increases. The addition of 5% inorganic color paste still maintains certain engineering properties. The addition of polyacrylic emulsion can improve the tensile strength of mortar, which is higher than the control group. The ultrasonic pulse velocity is a little different from compressive strength, but they have similar trends, and it is higher than 3500 m/s. The durability decreases as the inorganic color paste and polyacrylic emulsion increase, meaning the content of inorganic color paste has relatively significant influence. The surface resistivity at the age of 7 days was higher than 20 kΩ-cm. The findings show that different contents of inorganic color paste and 20% polyacrylic emulsion have different degrees of influence on the engineering properties of colorful mortar.

scholarly journals Attempts to Improve the Subsurface Properties of Horizontally-Formed Cementitious Composites Using Tin(II) Fluoride Nanoparticles

Coatings ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 83 ◽  
Author(s):  
Kamil Krzywiński ◽  
Łukasz Sadowski ◽  
Jacek Szymanowski ◽  
Andrzej Żak ◽  
Magdalena Piechówka-Mielnik
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Abrasion Resistance ◽  
Mechanical Performance ◽  
Reference Sample ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Cementitious Composites ◽  
Fluoride Nanoparticles

This article presents studies that were performed in order to improve the subsurface properties of horizontally-formed cementitious composites using tin(II) fluoride nanoparticles. The main aim of the study was to solve the problem of the decrease in subsurface properties caused by mortar bleeding and the segregation of the aggregate along the height of the overlay. The article also aims to highlight the patch grabbing difficulties that occur during the process of forming horizontally-formed cementitious composites. Four specimens were analyzed: one reference sample and three samples modified with the addition of 0.5, 1.0, and 1.5% of tin(II) fluoride nanoparticles in relation to the cement mass. To analyze the mechanical properties of the specimens, non-destructive (ultrasonic pulse velocity) and destructive tests (flexural tensile strength, compressive strength, abrasion resistance, pull-off strength) were performed. It was indicated that due to the addition of the tin(II) fluoride, it was possible to enhance the subsurface tensile strength and abrasion resistance of the tested cementitious composites. To confirm the obtained macroscopic results, the porosity of the subsurface was measured using SEM. It was also shown that the addition of the tin(II) fluoride nanoparticles did not reduce its flexural and compressive strength. The results show that horizontally-formed cementitious composites with the addition of 1.0% of tin(II) fluoride nanoparticles in relation to the cement mass obtained the most effective mechanical performance, especially with regard to subsurface properties.

scholarly journals The effects of adding waste plastic fibers on some properties of roller compacted concrete

2018 ◽  
Vol 162 ◽  
pp. 02008 ◽  
Author(s):  
Adil Abed ◽  
Abdulkader Al-Hadithi ◽  
Ahmed Salih Mohammed
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Water Absorption ◽  
Design Method ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Dry Density ◽  
Waste Plastic ◽  
Roller Compacted Concrete

An attempt to produce of roller compacted concrete (RCC) improved by adding waste plastic fibers (WPFs) resulting from cutting the PET beverage bottles was recorded in this study. The method which is used for production of RCC is an approved design method for ACI committee (5R-207,1980)[1]. WPF was added by volumetric percentages ranging between (0.5 to 2 %) and reference concrete mix was produced for comparison reason. Many tests were conducted on the models produced by rolling compacted concrete like compressive strength, flexural strength, modulus of elasticity, dry density, water absorption and ultrasonic pulse velocity. The analysis of the results showed that the use of plastic waste fibers (1%) had led to improvement in the properties of each of the compressive strength and flexural strength compared with reference concrete. Results also showed that the addition of these, fibers increase water absorption and reduce the speed of Ultrasonic pulse velocity.

A Study on Engineering Properties of Self-Compacting Concrete Containing Waste LCD Glass

2012 ◽  
Vol 476-478 ◽  
pp. 2009-2013
Author(s):  
Her Yung Wang ◽  
Tung Tsan Chen ◽  
Chia Sheng Hsieh
Keyword(s):  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Economic Security ◽  
Waste Minimization ◽  
Engineering Properties ◽  
Self Compacting Concrete ◽  
Slump Flow ◽  
Glass Sand ◽  
Furnace Slag

This study investigates self-compacting glass concrete(SCGC), which was used at water-to-binder ratios (w/b) of 0.28, with four kinds of glass sand replaced at various volume replacement ratios (0%, 10%, 20%, and 30%). Fly ash, blast furnace slag and superplasticizer were also added to research the engineering properties of concrete. With increasing amounts of replacement up to 30%, results show that: (1) slump flow and V-funnel time are increased; (2) 340 mm is passed at 0min, and the filling level is elevated at 45 min; (3) the compressive strength of SCGC aged 28 days at various replacement ratios rises up to 60 MPa. The ultrasonic pulse velocity and electrical resistance are also enhanced with increasing age and replacement. After 56 days, the electric resistivity is higher than 20 KΩ-cm, and the shrinkage of SCGC falls within 0.2%. This study suggests than SCGC has superior engineering properties. A mechanism for LCD optical waste glass usage can be established to achieve industrial waste minimization, resource recycling, and economic security

scholarly journals Fresh and Hardened Characteristics of Basalt-Glass Hybrid Fibre Reinforced Self Compacting Concrete

2019 ◽  
Vol 9 (2) ◽  
pp. 122-126
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Ultrasonic Pulse Velocity ◽  
Research Paper ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Self Compacting Concrete ◽  
Basalt Glass ◽  
Complete Filling ◽  
Hybrid Fibre

Proof that, just as results, self-compacting concrete is complete benchmark in the area of construction. Because of its highly profitable qualities, Self Compacting Concrete (SCC) extremely favoured and used drastically all over the construction world. SCC is that creative concrete which does not require any help of vibration for arrangements and compaction. It is shown that SCC have capability of complete filling formwork by property of flow under its self weight. Hence, it attain over all compaction, even in case of choke reinforcement. The main intent of this research paper is to find the fresh characteristics of basalt- glass hybrid fibre reinforced self-compacting concrete like T50 cm, spread flow, L-box, V funnel and hardened characteristics such as compressive strength, ultrasonic pulse velocity (UPV) and flexural strength at 7 and 28 days. Basalt-glass hybrid fibre reinforced self-compacting concrete has shown improved hardened characteristics with the addition of fibres.

scholarly journals INVESTIGATION OF THE EFFECT OF BASALT FIBER ON SELF-COMPACTING CONCRETE

2018 ◽  
Vol 6 (12) ◽  
pp. 38-45
Author(s):  
Aylin Ozodabas
Keyword(s):  
Compressive Strength ◽  
Basalt Fiber ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Self Compacting Concrete ◽  
Slump Flow ◽  
Flow Test ◽  
Standard Values ◽  
Application Fields

Self-compacting concrete is used in many application fields in construction, repair, and maintenance, and reinforcement. Self-settling concretes are advantageous in terms of labor and speed. Self-compacting concrete samples compared to the amount of binder; blast furnace slag 10 % and 30 %, plasticizer additive 2.7 %, basalt fiber 1.6 % in samples A and 3.2% in samples B were used. But basalt fiber was not used in samples C. The plasticizing additive used was kept constant in all samples. Slump Flow Test, V-funnel, L-box, compressive strength, ultrasonic pulse velocity, water absorption and weight per unit of volume tests were performed and the obtained values were discussed in detail in the discussion and conclusion sections. It has been observed that the use of basalt fiber reduces the workability in fresh concrete but increased the compressive strength values. Samples basalt containing could not provide determined standard values for slump flow and V-funnel and L-box tests. As the use of basalt fiber increased, the viscosity in the concrete decreased. For the samples with 1% basalt fiber, the pressure strength values decreased by 0.5% compared to the samples with basalt fiber.

PENGKAJIAN KEKUATAN BETON STRUKTUR JEMBATAN PASCA KEBAKARAN

2013 ◽  
Vol 12 (3) ◽  
Author(s):  
Sudarmadi Sudarmadi
Keyword(s):  
Compressive Strength ◽  
Concrete Strength ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Test Results ◽  
Concrete Compressive Strength ◽  
Strength Assessment ◽  
Concrete Testing

In this paper a case study about concrete strength assessment of bridge structure experiencing fire is discussed. Assessment methods include activities of visual inspection, concrete testing by Hammer Test, Ultrasonic Pulse Velocity Test, and Core Test. Then, test results are compared with the requirement of RSNI T-12-2004. Test results show that surface concrete at the location of fire deteriorates so that its quality is decreased into the category of Very Poor with ultrasonic pulse velocity ranges between 1,14 – 1,74 km/s. From test results also it can be known that concrete compressive strength of inner part of bridge pier ranges about 267 – 274 kg/cm2 and concrete compressive strength of beam and plate experiencing fire directly is about 173 kg/cm2 and 159 kg/cm2. It can be concluded that surface concrete strength at the location of fire does not meet the requirement of RSNI T-12-2004. So, repair on surface concrete of pier, beam, and plate at the location of fire is required.

scholarly journals The Hydration, Mechanical, Autogenous Shrinkage, Durability, and Sustainability Properties of Cement–Limestone–Slag Ternary Composites

2021 ◽  
Vol 13 (4) ◽  
pp. 1881
Author(s):  
Mei-Yu Xuan ◽  
Yi Han ◽  
Xiao-Yong Wang
Keyword(s):  
Compressive Strength ◽  
Electrical Resistivity ◽  
Experimental Studies ◽  
Autogenous Shrinkage ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Hydration Heat ◽  
Granulated Blast Furnace Slag ◽  
Binder Ratio

This study examines the hydration–mechanical–autogenous shrinkage–durability–sustainability properties of ternary composites with limestone filler (LF) and ground-granulated blast furnace slag (BFS). Four mixtures were prepared with a water/binder ratio of 0.3 and different replacement ratios varying from 0 to 45%. Multiple experimental studies were performed at various ages. The experimental results are summarized as follows: (1) As the replacement levels increased, compressive strength and autogenous shrinkage (AS) decreased, and this relationship was linear. (2) As the replacement levels increased, cumulative hydration heat decreased. At the age of 3 and 7 days, there was a linear relationship between compressive strength and cumulative hydration heat. (3) Out of all mixtures, the ultrasonic pulse velocity (UPV) and electrical resistivity exhibited a rapid increase in the early stages and tended to slow down in the latter stages. There was a crossover of UPV among various specimens. In the later stages, the electrical resistivity of ternary composite specimens was higher than plain specimens. (4) X-ray diffraction (XRD) results showed that LF and BFS have a synergistic effect. (5) With increasing replacement ratios, the CO2 emissions per unit strength reduced, indicating the sustainability of ternary composites.

Estimation of Compressive Strength of Recycled Aggregate High Strength Concrete Using Ultrasonic Pulse Velocity

2014 ◽  
Vol 605 ◽  
pp. 147-150
Author(s):  
Seong Uk Hong ◽  
Seung Hun Kim ◽  
Yong Taeg Lee
Keyword(s):  
Compressive Strength ◽  
High Strength Concrete ◽  
Coarse Aggregate ◽  
High Strength ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Recycled Aggregate ◽  
Strength Concrete ◽  
Recycled Coarse Aggregate

This study used the ultrasonic pulse velocity method, one of the non-destructive test methods that does not damage the building for maintenance of to-be-constructed concrete structures using recycled aggregates in order to estimate the compressive strength of high strength concrete structure using recycled coarse aggregate and provide elementary resources for technological establishment of ultrasonic pulse velocity method. 200 test pieces of high strength concrete 40, 50MPa using recycled coarse aggregate were manufactured by replacement rates (0, 30, 50, 100%) and age (1, 7, 28, 180days), and air curing was executed to measure compressive strength and wave velocity. As the result of compressive strength measurement, the one with age of 180day and design strength of 40MPa was 43.69MPa, recycled coarse aggregate replacement rate of 30% 50% 100% were 42.82, 41.22, 37.35MPa, and 50MPa was 52.50MPa, recycled coarse aggregate replacement rate of 30% 50% 100% were 49.02, 46.66, 45.30MPa, and while it could be seen that the test piece substituted with recycled aggregate was found to have lower strength than the test piece with natural aggregate only, but it still reached the design strength to a degree. The correlation of compressive strength and ultrasonic pulse velocity was found and regression analysis was conducted. The estimation formula for compressive strength of high strength concrete using recycled coarse aggregate was found to be Fc=0.069Vp4.05, R2=0.66

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