scholarly journals Testing the Use of Rounded Valley Aggregate in Concrete Mix in Comparison with Crushed Limestone Aggregate

2022 ◽  
Vol 16 (1) ◽  
pp. 282-293
Author(s):  
Mohmd Sarireh
Keyword(s):  
Limestone Aggregate ◽  
Concrete Mix ◽  
Crushed Limestone

Comparison of properties of steel slag and crushed limestone aggregate concretes

2003 ◽  
Vol 17 (2) ◽  
pp. 105-112 ◽  
Author(s):  
M Maslehuddin ◽  
Alfarabi M Sharif ◽  
M Shameem ◽  
M Ibrahim ◽  
M.S Barry
Keyword(s):  
Steel Slag ◽  
Limestone Aggregate ◽  
Crushed Limestone

scholarly journals Resistencia de concreto con agregado de alta absorción y baja relación a/c

2012 ◽  
Vol 2 (1) ◽  
pp. 21-28
Author(s):  
R. G. Solís ◽  
E. Moreno ◽  
E. Arjona
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
Construction Site ◽  
Cement Ratio ◽  
Limestone Aggregate ◽  
Concrete Mixtures ◽  
Water To Cement Ratio ◽  
Maximum Compressive Strength ◽  
Crushed Limestone ◽  
High Absorption

RESUMENLa resistencia del concreto depende de la calidad de la pasta de cemento y de las características de los agregados pétreos. La primera es controlada por la relación agua - cemento, mientras que las propiedades de los agregados generalmente no pueden ser manipuladas ya que se suele utilizar aquellos que están disponibles cerca de la construcción. En muchas regiones rocas con propiedades no deseables son utilizadas como agregado. Por lo tanto, el objetivo de este trabajo fue responder a la pregunta sobre cuál sería la máxima resistencia de diseño que se podría utilizar para concretos fabricados con un tipo específico de agregados obtenidos a partir de la trituración de roca caliza de alta absorción. Se probaron concretos con seis relaciones agua - cemento y dos tamaños de agregado grueso. Se concluyó que con los agregados estudiados es posible fabricar concretos de hasta 500 k/cm2 de f’c.Palabras clave: Absorción; agregados calizos; concreto; relación agua/cemento; resistencia.ABSTRACTConcrete strength depends on the cement paste quality and on the characteristics of the aggregates. The former is controlled by the water to cement ratio, while the properties of the aggregate, in general, cannot be manipulated as it is customary to employ the ones available near the construction site. In many regions rocks with no desirable properties are employed as aggregates. Therefore, the aim of this study was to answer the question about what would that be the maximum compressive strength attainable in concrete made with a specific type of aggregate obtained from crushed limestone of high absorption. Concrete mixtures involved six water to cement ratios and two sizes of coarse aggregate. It was concluded that with this type of aggregate it is possible to made concrete with compressive strength up to 500 k/cm2 of f’c.Key words: Absorption; compressive strength; concrete; limestone aggregate; water/cement ratio.

scholarly journals Understanding the Microstructure of Mortars for Cultural Heritage Using X-ray CT and MIP

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 5939
Author(s):  
Valentina Brunello ◽  
Carmen Canevali ◽  
Cristina Corti ◽  
Tim De De Kock ◽  
Laura Rampazzi ◽  
...  
Keyword(s):  
Cultural Heritage ◽  
Building Materials ◽  
3D Visualization ◽  
Limestone Aggregate ◽  
Cultural Heritage Conservation ◽  
3D Data ◽  
Visualization Software ◽  
Cement Mortars ◽  
Crushed Limestone

In this study, the microstructure of mock-up mortar specimens for a historic environment, composed of different mixtures, was studied using mercury intrusion porosity (MIP) and microcomputed tomography (µCT), highlighting the advantages and drawbacks of both techniques. Porosity, sphericity, and pores size distribution were studied, evaluating changes according to mortar composition (aerial and hydraulic binders, quartz sand, and crushed limestone aggregate). The µCT results were rendered using 3D visualization software, which provides complementary information for the interpretation of the data obtained using 3D data-analysis software. Moreover, µCT contributes to the interpretation of MIP results of mortars. On the other hand, MIP showed significant ink-bottle effects in lime and cement mortars samples that should be taken into account when interpreting the results. Moreover, the MIP results highlighted how gypsum mortar samples display a porosity distribution that is best studied using this technique. This multi-analytical approach provides important insights into the interpretation of the porosimetric data obtained. This is crucial in the characterization of mortars and provides key information for the study of building materials and cultural heritage conservation.

Soaking Effects on Strength Characteristics of Crushed Gravel and Limestone Unbound Aggregates

2018 ◽  
Vol 2672 (52) ◽  
pp. 34-45 ◽  
Author(s):  
Abdolreza Osouli ◽  
Goran Othmanawny ◽  
Erol Tutumluer ◽  
Sheila Beshears ◽  
Heather Shoup
Keyword(s):  
Quality Control ◽  
Strength Characteristics ◽  
Base Thickness ◽  
Fines Content ◽  
Limestone Aggregate ◽  
Unbound Aggregates ◽  
Transportation Agencies ◽  
Crushed Limestone ◽  
Unbound Aggregate ◽  
Aggregate Strength

Strength characteristics of unbound aggregate materials critically affect base and sub-base thickness designs of construction working platforms and flexible pavements. Unsoaked California Bearing Ratio (CBR) is commonly used by state transportation agencies for quality control and design. However, depending on the amount of fines content (i.e., passing No. 200 sieve), the strength characteristics of unbound aggregate layers may severely be affected after soaking. This study investigates any correlations that may exist between soaked and unsoaked strengths of crushed gravel and limestone aggregates commonly used in the State of Illinois. A test matrix was established to consider the effects of varying fines content at 5% and 12%, plasticity index (PI) at 5% and 9%, and dust ratio (DR) at 0.4, 0.6, and 1.0 on aggregate strength. DR is the ratio of percent passing No. 200 sieve to percent passing No. 40 sieve. Most of the aggregate strength characterizations with 5% fines content were not sensitive to soaking in terms of CBR index. However, significant reductions in soaked and unsoaked CBR values were observed when fines content increased from 5% to 12%. The crushed limestone aggregate strengths were more affected by soaking than the crushed gravel aggregates. A prediction model was developed to predict soaked CBR values from unsoaked CBR tests considering material type, fines content, PI and DR.

Sign in / Sign up

Export Citation Format

Share Document