Engineering and Mineralogical Properties of Portland Cement Used for Building and Road Construction in Cameroon

2021 ◽  
Author(s):  
Linda Lekuna Duna ◽  
Nguimeya Nguepi Gide Audrey ◽  
Arlin Bruno Tchamba ◽  
Ndigui Billong ◽  
Elie Kamseu ◽  
...  
Keyword(s):  
Portland Cement ◽  
Road Construction ◽  
Mineralogical Properties

scholarly journals Modeling the composition of fine-grained modified concrete elaborated with vibropressing technology

2019 ◽  
Vol 298 ◽  
pp. 00133 ◽  
Author(s):  
E. R. Pyataev ◽  
A. Y. Ushakov
Keyword(s):  
Portland Cement ◽  
Experimental Research ◽  
Frost Resistance ◽  
Building Materials ◽  
Road Construction ◽  
Average Density ◽  
Optimal Composition ◽  
Fine Grained ◽  
Main Components ◽  
Modifying Additive

The article analyzes the property requirements of small-piece products used in road construction, specially those related to water and frost resistance. It describes the main features of the vibration technologies involved in the manufacture of building materials, in particular, paving slabs. The article presents conclusive results, obtained through scientific research, which allow us to establish the influence of both, the costs of the main components and the parameters of vibration compression, on the properties of the final product. Combining the analysis of classical methods with the results of experimental research, a methodology has been developed for reaching an optimal composition of fine-grained vibropressed concrete modified with active additives. It is shown that the particular strength achieved from the combination of vibroformed fine-grained concrete, whose average density is 2270–2320 kg/m3, with polymer multifunctional modifiers, is mainly due to the use of Portland cement, a modifying additive, and the pressure conditions employed during the experiment..

scholarly journals Jambi and Palembang clay soil stabilization for pavement matrix in road construction by using Portland cement type I

2019 ◽  
Vol 276 ◽  
pp. 05005
Author(s):  
Wawan Kuswaya ◽  
Wahyudi Marsiano ◽  
Syafalni Syafalni ◽  
Jonbi
Keyword(s):  
Portland Cement ◽  
Soil Stabilization ◽  
Clay Soil ◽  
Test Procedure ◽  
Road Construction ◽  
Dry Weight ◽  
Type I ◽  
Curing Time ◽  
Cement Type ◽  
Highly Active

The need for a pavement matrix in road construction, especially in Sumatra area, is now more difficult and expensive because the deposit materials are concentrated in Java and most of them are not available. For this reason, soil stabilization is a way out of this problem. On this basis it is necessary to conduct stabilization research with highly active stabilization material by using Portland cement type I. The soil to be stabilized is clay soil which is derived from the areas of Jambi and Palembang and which has a low CBR value less than the requirement for sub base or pavement (< 10%), with the expected CBR value of stabilization to be suitable for road construction. This research covers physical and soil mechanical properties which are compaction parameter and CBR value with 3 days of dry curing time and 4 days of soak curing time using ASTM test procedure. Variations of cement addition were used of 6%, 8%, and 10% for the clay soil from Palembang and 8%, 10%, and 12% for the clay soil from Jambi, by percentage of dry weight of the sample test. The results of this study showed that the CBR value significantly increased with the addition of cement, with Palembang soil CBR value rising from 3.46% to 130.74% and Jambi soil CBR value rising from 7.20% to 206.43% respectively.

scholarly journals Selection of the optimal composition for the device of the base of the pavement from soils treated with inorganic binder, during the construction of the entrance from the highway M-25 Novorossiysk – Kerch Strait to Kerch and the dry cargo area of the sea port of Taman on the section km 0 – km 42

2019 ◽  
Vol 6 (2) ◽  
Author(s):  
Maksim Katasonov ◽  
Andrey Kochetkov ◽  
Dmitriy Gofman ◽  
Vladimir Kuxhausen
Keyword(s):  
Portland Cement ◽  
Sandy Loam ◽  
Soil Aggregates ◽  
Construction Materials ◽  
Road Construction ◽  
Qualitative Change ◽  
Clay Soils ◽  
Reinforced Cement ◽  
Soil Units ◽  
Main Component

When strengthening clay soils, cement acts as a structure-forming agent and is the main component of the mixture, providing the creation of the crystallization structure of the material. In the formation of this structure is a qualitative change in the natural properties of the soil. The introduction of cement into the clay soil leads to a significant reduction in the amount of macropores by filling the space between the soil units with hydration products, which in turn leads to a decrease in the permeability of the material. Soils with a high content of clay minerals are difficult to strengthen due to the tendency to clumping. This is confirmed by experiments in which it was found that the strength of the clay sandy loam reinforced cement above the loam and clay with the introduction of the same amount. Inactive or low-active zone in loam and clay corresponds to low costs of binder, which may be due to the uneven distribution of cement in clay soils, as well as low strength of soil aggregates, the surface of which does not interact with the products of hydration. The use of only Portland cement in the strengthening of heavy clays (the number of plasticity is not more than 27) is not enough to achieve high physical and technical properties, and, consequently, the production of high-quality road construction materials is possible only with the introduction of various modifying additives. When selecting the composition, several variants of cohesive soils and the percentage of inorganic binders (cement, Portland cement) were considered.

scholarly journals Preliminary Examination of the System Fly Ash-Bottom Ash-Flue Gas Desulphurization Gypsum-Portland Cement-Water for Road Construction

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
R. Tokalic ◽  
S. Marinkovic ◽  
P. Trifunovic ◽  
G. Devic ◽  
S. Zildzovic
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Flue Gas ◽  
Bottom Ash ◽  
Road Construction ◽  
Mineralogical Composition ◽  
Mass Ratio ◽  
Preliminary Examination ◽  
Potential Use ◽  
Flue Gas Desulphurization

This paper describes an investigation into the use of three power plant wastes: fly ash, flue gas desulphurization gypsum, and bottom ash for subbase layers in road construction. Two kinds of mixtures of these wastes with Portland cement and water were made: first with fly ash consisting of coarser particles (<1.651 mm) and second with fly ash consisting of smaller particles (<0.42 mm). The mass ratio of fly ash-Portland cement-flue gas desulphurization gypsum-bottom ash was the same (3 : 1 : 1 : 5) in both mixtures. For both mixtures, the compressive strength, the mineralogical composition, and the leaching characteristics were determined at different times, 7 and 28 days, after preparation. The obtained results showed that both mixtures could find a potential use for subbase layers in road construction.

scholarly journals Recycling of coal ash as a building material via a stabilization/solidification method

2013 ◽  
Vol 15 (4) ◽  
pp. 485-493 ◽  
Keyword(s):  
Portland Cement ◽  
Environmental Effects ◽  
Building Material ◽  
Coal Ash ◽  
Physical Chemical ◽  
Mineralogical Properties ◽  
Construction Products ◽  
Construction Product

<p>This study examines stabilization/solidification (S/S) techniques for coal ash/cement systems that involve the production of construction products while minimizing contamination and recycling the coal ash (CA). In these techniques, the polluted components of coal ash are fixed in a cement body via adsorption and confinement mechanisms, and thus, the possible impact of these pollutants on the environment is minimized. In the first step of this study, the physical, chemical, radioactive and mineralogical properties of the material used were determined. Second, coal ash (CA) was used to replace portland cement (PC) in the following proportions: 0%, 5%, 10%, 15%, 20%, 25%, 30%, 40% and 50% of PC by weight. Finally, the usability of coal ash as a construction product and the environmental effects of such usage were determined.</p>

scholarly journals Influence of “Nicoflok” Polymer-Mineral with Portland Cement on Granular Soils and Recycled Asphalt Material

2020 ◽  
Vol 15 (5) ◽  
pp. 94-117
Author(s):  
Mahdi Zirak Baroughi ◽  
Amir Hassan Rezaei ◽  
Hooshang Katebi
Keyword(s):  
Portland Cement ◽  
Construction Projects ◽  
Soil Stabilization ◽  
Road Construction ◽  
High Volume ◽  
Recycled Asphalt ◽  
The Road ◽  
Subgrade Soils ◽  
Asphalt Materials ◽  
Under Construction

In road construction projects, due to the high volume of soil materials, the costs of supplying and transporting high-quality materials are very high, they may also include the crossing between different geotechnical lands with different types of soils and soil stabilization used to modify resistance characteristics of soil materials in different layers of the road. Addition of a stabilizing agent can improve the properties of aggregates and subgrade soils. In this study, the effect caused by the combined action of polymer-mineral composition “Nicoflok” and cement stabilization on the strength characteristics and durability of local materials, adopted from under-construction Ilkhchi highway project, was investigated. In addition, the effects of stabilizers on the recycled asphalt materials was studied to assess the possibility of using them in the pavement structure. Samples with 0, 0.5, 0.9 and 1.3 percent of Nicoflok combined with varying percentages of cement content were made and CBR tests were conducted after curing. Strength degradation of samples under 50 cycles of freeze-thaw was also investigated. The results show that addition of cement- Nicoflok admixture to the subgrade soil considerably increases CBR values, which leads to reduction of the required material amount. The efficiency of this polymer with Portland cement depends on several factors, such as the amount of cement, curing time, size and shape of soil grains. The optimum dosage of Nicoflok was 0.9% mixed with 1% cement. Stabilizing the base and recycled asphalt materials with cement and Nicoflok also improves the long-term performance of the pavement.

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