scholarly journals Assessment of the compressive strength of lime mortar in the joints of brick walls - case study

2018 ◽  
Vol 163 ◽  
pp. 02006 ◽  
Author(s):  
Dawid Łątka ◽  
Piotr Matysek
Keyword(s):  
Compressive Strength ◽  
Wall Thickness ◽  
Test Results ◽  
Lime Mortar ◽  
Punch Test ◽  
The Difference

The paper presents the test results of lime mortar compressive strength in the joints of brick walls. The tests were carried out with the Double Punch Test (DPT) method and with the use of an impact penetrometer (penetrometric test PT) on original samples taken from the structure of a building erected in the 1880s. The obtained results have shown that the predictions of the mortar compressive strength using both methods were very consistent (the difference 6%). The penetrometric method also made it possible to assess the homogeneity of the mortar in the direction of the wall thickness.

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.

Experimental Study on Strength Characteristics Comparison of Tamped and Poured Concrete

2010 ◽  
Vol 168-170 ◽  
pp. 492-497
Author(s):  
Xi Yuan Liu ◽  
Yan Feng Li ◽  
Zhao Xia Chen ◽  
Ling Wang
Keyword(s):  
Compressive Strength ◽  
Influence Factors ◽  
Strength Characteristics ◽  
Test Results ◽  
Optimum Parameters ◽  
Foundation Treatment ◽  
Mix Proportion ◽  
Curing Condition ◽  
The Difference ◽  
The Cost

Piles formed by tamped concrete are a kind of technology in foundation treatment. In order to study the difference of strength characteristics between tamped and ordinary poured concrete, optimum parameters of mix proportion on tamped concrete are obtained by heavy compaction test in laboratory, then unconfined compressive strength tests are accomplished on the basis of optimum parameters of mix proportion. Influence factors of strength characteristics of tamped concrete are studied, such as cement-aggregate ratio, curing age, curing condition and so on. Finally, strength characteristics of tamped and ordinary poured concrete are compared. The test results indicate that the tamped concrete is hardened quickly and early-strength. In standard, water and saturated soil curing condition, compressive strength all grows sufficiency, thus tamped concrete can be used in ground and underground environment. At the same time, a higher strength can be obtained by smaller cement content, and the cost of tamped concrete can be reduced effectively.

scholarly journals A Study on High Strength Concrete with Moderate Cement Content Incorporating Limestone Powder

2014 ◽  
Vol 61 (1) ◽  
pp. 43-58 ◽  
Author(s):  
Alaa M. Rashad ◽  
Hosam.El Din H. Seleem
Keyword(s):  
Compressive Strength ◽  
High Strength Concrete ◽  
Coarse Aggregate ◽  
Cement Content ◽  
Drying Shrinkage ◽  
High Strength ◽  
Limestone Powder ◽  
Test Results ◽  
Strength Concrete ◽  
The Difference

Abstract This paper presents the results of an investigation to assess the validity of producing high strength concrete (HSC) using moderate cement content to reduce the consumption of the binders. Cement content is lowered from 500 kg/m3 to 400 kg/m3. The difference in cement content is compensated by the addition of fine limestone (LS) powder. Pozzolans were incorporated as an addition to cement. Different coarse aggregate types were employed. Workability, compressive strength, tensile strength, permeability and drying shrinkage were measured. Test results revealed that HSC with a compressive strength up to 79 MPa (at 90 days age) could be produced with moderate cement content. The mixtures consistency and drying shrinkage are greatly enhanced due to employing LS powder and the permeability is satisfactory. To provide better solution to some concrete disadvantages like cracking and drying shrinkage, using an economic rate for cement are believed to reduce these disadvantages.

scholarly journals KEKUATAN TEKAN MATERIAL SPOILER MOBIL BERBASIS KOMPOSIT ROTAN EPOKSI

POROS ◽  
2018 ◽  
Vol 16 (1) ◽  
Author(s):  
Agustinus Purna Irawan
Keyword(s):  
Compressive Strength ◽  
Product Development ◽  
Free Market ◽  
Strength Test ◽  
Reinforced Composites ◽  
Test Results ◽  
Compressive Strength Test ◽  
The Difference ◽  
Strength Difference

This study aims to obtain the compressive strength of the material of a car spoiler product that was developed using materials from rattan fiber epoxy reinforced composites material. The car spoiler products are car accessories that also function as one of the equipment related to aerodynamics. The study was conducted by making test samples of rattan fiber epoxy reinforced composites and compared with the compressive strength of plastic spoiler materials obtained from the free market. The testing standard used is the compressive strength test of ASTM D 695. Based on the test results obtained compressive strength of spoiler made of plastic is 47.68 ± 1.37 MPa and rattan fiber epoxy reinforced composites material is 43.49 ± 4.21 MPa, with a compressive strength difference of 8.8%. The compressive strength of modeling results obtained a compressive strength of 47.97 MPa. This result is quite good and the difference is quite small, so the results of the study can be used as a reference for further product development.

Use of Concrete Wastes in Concrete Paving Blocks by Thermal-Mechanical Separation

2011 ◽  
Vol 374-377 ◽  
pp. 1303-1306
Author(s):  
Qing Bo Tian ◽  
Li Na Xu ◽  
Li Yang ◽  
Xiu Hui Wang ◽  
Hong Gao
Keyword(s):  
Compressive Strength ◽  
Active Material ◽  
Critical Value ◽  
Raw Material ◽  
Test Results ◽  
Water Addition ◽  
Steam Curing ◽  
Mechanical Separation ◽  
The Difference ◽  
Water Amount

A concrete paving blocks was produced using pretreated concrete wastes as main raw material by pressure forming and steam-curing at 70°C. The test results showed that with the increase of water addition, the paving blocks increase its strength. And as the additions of water amount reach to a critical value, the compressive strength has an adverse change and decreased. As the rise of ratio of cement and wastes, the compressive strength also increases. The difference in various ratios of cement and wastes is that the difference of water needed as the compressive strength achieved its highest value. The thermal treatment temperatures has greatly influence on the compressive strength. The increments of thermal-treated temperatures induce the active material to form and cause the particle grading more reasonable in the concrete wastes, which is benefit to the shaping of specimen and increasing of strength. The maximum compressive strength of 53.2 MPa is obtained in the mixture thermal-treated at 800°C by adjusting the water additions.

Experimental Assessment of the Influence of Multiple Cyclic Loading on Selected Properties of Lightweight Concrete

2019 ◽  
Vol 292 ◽  
pp. 45-49
Author(s):  
Petr Misák ◽  
Dalibor Kocáb ◽  
Martin Alexa ◽  
Barbara Kucharczyková ◽  
Petr Daněk ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Cyclic Loading ◽  
Modulus Of Elasticity ◽  
Test Specimen ◽  
Lightweight Concrete ◽  
Test Results ◽  
Static Modulus ◽  
Before And After ◽  
The Difference ◽  
Static Modulus Of Elasticity

The paper deals with results of the experiment when ordinary and lightweight concrete was subjected to cyclic loading. Each test specimen was loaded with the force equivalent to one third of the expected compressive strength value similarly to the static modulus of elasticity test with the difference that the total number of loading cycles was nearly 4500. Dynamic modulus of elasticity and compressive strength was measured before and after cyclic loading. The result of this experiment is statistical analysis of the test results and assessment of the influence of multiple cyclic loading.

The Influence Wall Thickness of Cement Hollow Spheres towards Compressive Properties of Cement Syntactic Foam

2013 ◽  
Vol 701 ◽  
pp. 291-295
Author(s):  
Norwanis Hasan ◽  
Syed Fuad Saiyid Hashim ◽  
Zulkifli Mohamad Ariff
Keyword(s):  
Compressive Strength ◽  
Wall Thickness ◽  
Hollow Spheres ◽  
Syntactic Foam ◽  
Cement Matrix ◽  
Compressive Properties ◽  
Failure Patterns ◽  
Different Types ◽  
Cellular Composite ◽  
The Difference

An innovative technique in producing cement syntactic foam (CSF) was proposed in this investigation. This cellular composite material basically consists of a cement matrix embedded with in-house developed cement hollow spheres (CHS). The produced foams incorporated with CHS having different wall thickness, were characterized for compressive strength and then compared with that of plain cement. It was observed that the CSFs were 37%-55% lighter than the plain cement but possessed compromised compressive strength. The comparative compressive properties of CSFs were also evaluated and reported. It was found that the CSF incorporated with thicker-coated CHS showed higher compressive strength compared to that of incorporated with thinner-coated CHS. The failure patterns within the test samples were also examined to determine the failure mechanism. These observations showed that both CSFs exhibited shearing type failure but exhibit different types of crack fractures due to the difference in CHS wall thickness.

scholarly journals Study of the Compressive Strength of Mortars as a Function of Material Composition, Workability, and Specimen Geometry

2020 ◽  
Vol 2020 ◽  
pp. 1-6 ◽  
Author(s):  
M. T. Marvila ◽  
A. R. G. Azevedo ◽  
J. Alexandre ◽  
C. M. F. Vieira ◽  
E. B. Zanelato ◽  
...  
Keyword(s):  
Finite Element ◽  
Compressive Strength ◽  
Hydrated Lime ◽  
Strength Properties ◽  
Test Results ◽  
Compression Tests ◽  
Statistical Dispersion ◽  
Cylindrical Mold ◽  
The Difference ◽  
Marble Waste

In the present work, the statistical dispersion of the mortar compressive strength as a function of the geometric parameters of the specimens as well as the effect of the mortar workability difference on the compressive strength was investigated. For this purpose, specimens were prepared for six types of mortars: two conventional mortars in the proportions of 1 : 1 : 6 and 1 : 2 : 9 of cement, hydrated lime, and sand, respectively, two with clay replacing lime, and two with marble waste in place of lime. The results confirm the difference between the results found for the two geometries due to the differences in the heights of the molding layers and show that the workability of the mortar modifies the resistance properties, especially in the cylindrical mold where the molding of the specimens is more complex. By comparing the differences between the destructive test results and those defined by the Finite Element Modeling (FEM) for conventional mortars, it was clear that the effect of excess material in the sample during the compression tests did not change the strength properties studied. This facilitates the performance of the assay as specimens may be used excessively on the side without the need for sample rectification.

Evaluation of Thermal Aging Embrittlement in Main Coolant Pipe Steel by Small Punch Test

2010 ◽  
Author(s):  
Fei Xue ◽  
Weiwei Yu ◽  
Xiao Chen ◽  
Yan Liu ◽  
Zhenhao Shi ◽  
...  
Keyword(s):  
Thermal Aging ◽  
Nuclear Power ◽  
Power Plants ◽  
Aging Effect ◽  
Initial Increase ◽  
Pipe Material ◽  
Test Results ◽  
Small Punch ◽  
Punch Test ◽  
The Difference

To evaluate the thermal aging embrittlement in the main coolant pipe material of nuclear power plants, a series of small punch testes at room temperature were performed on Z3CN20.09M duplex stainless steel aged at 400°C for up to 10000 hours, and then the fractured specimens were examined by the SEM. The test results indicate that the aging heat treatment led to a slight increase of the strength, and caused an initial increase on the small punch energy followed by continual decrease when the aging time extends 1000 hours. Besides, the fracture mode of specimens aged at 400°C for different time exhibited some discrepancy, but the difference is not clearly to reflect the thermal aging effect on the material.

scholarly journals The Effects of Admixtures Addition on Slump Decrease and Concrete Compressive Strength at B-1 Concrete Works

2019 ◽  
Vol 8 (4) ◽  
pp. 93
Author(s):  
Basuki Setiyo Budi ◽  
Supriyadi ◽  
Edy Suhartono ◽  
Mawardi ◽  
Sukoyo ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Regional Scale ◽  
Test Results ◽  
Normal Concrete ◽  
Toll Road ◽  
Central Java ◽  
Class B ◽  
Excavation Work ◽  
The Difference ◽  
Concrete Casting

Semarang - Solo Toll Road is part of the Trans Java highway, which has a strategic meaning in the development of road networks, specifically in Central Java and also on a regional scale. The construction project generally consists of excavation work, stockpiles and bridge work. The number of work in the project therefore allows the emergence of a problem that can hinder the development process and one of which was related to concrete casting in the construction of the Kali Putih Bridge 1, where there was a slump decrease in columns P1 and P3 concrete pre-casting (30 Mpa). However, a slump test was carried out on column P1 in STA. 61 + 368,500, and P3 in STA. 61 + 293,500, which resulted in 3.5 cm and 4 cm collapse respectively. Hence, they did not meet specification on B-1 concrete, which was 7.5 ± 2.5 cm. In addition, Superplasticizer was used to overcome this problem, as it was capable of restoring freshness/workability. This study, therefore, aimed to determine the effect of the incorporating superplasticizer and retarder into concrete, on its compressive strength, slump decrease, and time, utilizing 24 test cylindrical specimens (7-days and 14-days), through pressure testing. Furthermore, the slump testing was conducted every 20 minutes for 120 minutes, to determine the reduction time, and the findings further indicated that adding a retarder to class B-1 concrete was capable of increasing the functional period (67 minutes on a slump of 7 ± 2.5 cm). However, the addition of Superplasticizer was also able to repair the slumps, which did not meet the requirements, including the specimen that involved the incorporation of a retarder (82.5 minutes, which resulted in a 1.9 cm slump that was further increased to 17.5 cm after augmentation. Furthermore, these effects were due to its ability to reduce the compressive strength by 3.13% and 6.14% on the 7-days and 14-day specimens, respectively. However, the SPSS v.23.0 test results showed the difference in compressive strength between the normal concrete + retarder and normal concrete + retarder + SP, with a sig value of 0.021 <a = 0.05 (Turkey HSD Test) and 0.0009 <a 0.05 (LSD Test).

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