Mechanical properties and flow characteristics of dolomite …
The number of pores formed during the firing process of the porous ceramics was large. Although the proportion of the dolomite in the aggregate was reduced, its compressive strength did not increase significantly. The compressive strength of the porous ceramics prepared with corn flour decreased from 8.41 to 7.42 MPa.
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Strength prediction model of fractured dolomite and …
According to the "Specifications for Design Highway Tunnels" (JTG D70-2018), the suggested classification strength threshold for hard rock is 60MPa, and the uniaxial compressive strength of typical dolomite is 90 MPa. Therefore, the strength of dolomite is divided into three grades: Grade I (< 60 MPa), Grade II (60–90 MPa), and …
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Physical parameters, tensile and compressive …
PDF | The purpose of this paper is to investigate the strength, physical and engineering index parameters of selected dolomitic rocks with emphasis on... | Find, read and cite all the research...
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An Experimental Analysis on Behaviour of Concrete with
From Fig. 6 a clear decrease in strength is seen with a rise in dolomite powder content. As dolomite contains higher quantities of MgO than the permissible tolerance limits specified by IS: 269-2015, this may attribute the unsoundness to the concrete [10]. The unsoundness in concrete creates the surface cracks and leads to …
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Dolomite | Formation, Structure, Properties, Uses,
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Dolomite Countertops: All You Need To KnowWebDolomite. Add ⊕. 1 Properties. 1.1 Physical Properties. 1.1.1 Hardness. 3.5-4. 1.1.2 Grain Size. Medium to Fine Coarse Grained. 1.1.3 Fracture. Conchoidal. 1.1.4 Streak. White. 1.1.5 Porosity. Less Porous. 1.1.6 …
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Investigation of dolomite' rock brittle fracture using fully …
The fracture of dolomite and other rocks is mostly due to tensile or shear cracking [60]. The tensile strength of the rock and the presence of pre-existing cracks and other imperfections in its structure influence the stress intensity factor K c, which is a measure of the material's resistance to fracture. The post-failure behavior in the ...
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Reaction mechanism of dolomite powder in Portland-dolomite cement
Especially, the reaction mechanism of dolomite powder in PDC is not yet clearly understood. This work systematically investigated the effect of various replacement levels of dolomite powder (10, 20 and 30 wt%) on the compressive strength, hydration products and microstructure of portland cement cured at 20, 40 and 60 °C, and the …
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Strength and durability assessment of concrete containing dolomite
The comparative analysis between the predicted compressive strength of both the model at 90 and 365 days were done in this study. Experimental compressive strength. The compressive strength test results of concrete containing dolomite quarry waste are shown in Fig. 8a. An increase in dolomite quarry waste caused a reduction in …
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Frontiers | Uniaxial Compression Damage Mechanical …
Uniaxial compression law of dolomite samples under different high-humidity times: (A) Stress-strain curves; (B) Uniaxial compressive strength. Figure 7B shows that …
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Chemical composition and strength of dolomite …
The chemical composition of dolomite and the compressive strength of dolomite geopolymer composites were studied. The both composites prepared with mechanical mixer manufactured by with rotor speed of 350 rpm and curing in the oven for 24 hours at 80˚C. XRF analysis showThe dolomite raw materials contain fewer amounts of …
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Factors Affecting the Compressive Strength of Geopolymers…
For this reason, this study compiled information on the different variables that affect the compressive strength of geopolymers, such as Si/Al ratio, curing temperature and time, type and concentration of alkaline activator, water content, and the effect of impurities. ..., dolomite, glass [47,48,49,50,51], recycled materials, among others ...
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Phosphate Cements Based on Calcined Dolomite: Influence …
The increase in MKP dosage increases the compressive strength due to the formation of K-struvite. The mixing of dolomite with sand, followed by thermal treatment at 1200 °C, modifies its composition and reactivity; the compressive strength of phosphate cements obtained by mixing this solid precursor with MKP increases up to 28 days of …
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Empirical relations between rock strength and physical …
In this study, 31 empirical equations are summarized that relate unconfined compressive strength and internal friction angle of ... and limestone and dolomite) to physical properties (such as velocity, modulus, and porosity). These equations can be used to estimate rock strength from parameters measurable with geophysical well logs. The ability ...
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Prospects for Effective Use of Dolomite in Concrete …
In the previous experiments, compressive strength of dolomite . lime morta r samples has been compared to various ty pes of air . lime [13], summ ariz ed in Table I. T o enhance t he compressive .
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Physical and Mechanical Characterization of …
The static uniaxial compressive strength of dolomite is found to be 38.59 MPa. The elastic modulus from the stress-strain graph at 50% of peak stress value is …
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PHYSICAL PARAMETERS, TENSILE AND COMPRESSIVE …
Uniaxial Compressive Strength . Wave Velocity . Strong Correlation . Point Load . Brazilian Tensile Strength . Point Load Strength. The purpose of this paper is to investigate the …
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Effect of unconfined compressive strength of rock on …
UCS representing dolomite, shale, sandstone, granite, basalt and quartzite medium has been investigated through a three-dimensional finite element model having dimensions of 30 m × 30 m in cross section and 35 m in length generated in Abaqus. ... In this paper, the effect of unconfined compressive strength (UCS) of the rock …
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Effects of mineralogical composition on uniaxial compressive …
It indicated that the uniaxial compressive strength of sandstones was significantly dependent on the quartz content. However, both the calcite and dolomite contents lead to high values of P-value much larger than 0.05. Therefore, the uniaxial compressive strength of sandstones was not affected by the carbonate (i.e., calcite and …
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Alkali-activated dolomite and its outstanding mechanical strength
Abstract. Alkali-activated dolomite (AD) was successfully prepared from dolomite powder by alkali activation via the process of compression molding at room temperature (22 °C). The AD put up excellent early strength and high strength properties: the 2-day and 28-day compressive strength of AD reached 58 MPa and 122 MPa …
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Performance evaluation of dolomite production waste in
The concrete compressive strength, flexure strength, and dynamic elastic modulus were reduced by 3.31, 3.28, and 3.28%, respectively, at the 10% inclusion of dolomite production waste than that of the control mix. The initial and ultimate energy absorption capacity decreased by 4.82 and 4.68%, respectively, at 10% incorporation of …
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Recycling of dolomite powder in clay bricks: Effects on …
The compressive strength of clay bricks decreases by increasing the DP percentage. ... The clay bricks fired at 1000 °C with 10%, 20% and 30% of dolomite powder exhibit a compressive strength of 12.5–56.3% less than the control fired clay bricks (DP0 samples). Download : Download high-res image (265KB) Download : Download full-size …
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New approach for assessing uniaxial compressive strength …
The uniaxial compressive strength (UCS) of rocks is an essential input parameter for engineering design in mining and civil engineering. ... The dolomitic marble contained 77% of dolomite mineral and 10% graphite, 9% mica, and 4% calcite. It is well known that the mineral compositions and microstructure affect significantly the physico ...
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Effect of elevated temperatures on mechanical
Volcanic pumice rocks have a much lower density and compressive strength compared to Dolomite rocks [65]. Furthermore, the intended air AE caused voids trapped inside the cement matrix, thereby reducing the concrete strength. Both have exerted a negative effect on the mechanical properties of concrete, particularly compressive …
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Estimation of Unconfined Compressive Strength (UCS) of
Central Alborz Zone (CAZ) is one of the most important zones in Iran, which comprises a wide variety of carbonate rocks such as limestone, dolomite, and their compounds. Therefore, determining engineering geological characteristics of carbonate rocks is essential for proper use in civil, mining, and geotechnical engineering. The …
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Effect of limestone powder on the properties of alkali …
LSP at levels ≤ 30 % increased compressive strength of slag, MK-clay, FA/slag geopolymers. ... Part of CaCO 3 may turn into dolomite by replacement with MgCO 3 at levels up to 46 %. In spite of most of the available limestones are pure, they contain less than 5 % impurities (non-carbonated materials). The LS is available in different forms ...
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(PDF) EFFECT OF FIRE ON BEHAVIOR OF CONCRETE
the compressive strength of dolomite concrete gradually cooled increases by about 22% of the original stren g th after one hour exposed to fire t hen the compressive
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Reaction mechanism of dolomite powder in Portland-dolomite …
The dolomite and limestone powders contain 95.4% CaMg(CO 3) 2 and 95.5% CaCO 3 respectively, determined by thermal analysis, and their X-ray diffraction patterns are present in Fig. 2. The methylene blue () values of. Compressive strength. Fig. 3a-c show the compressive strength development of different mixtures cured at 20, …
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Durability of Lightweight Self-Curing Concrete
The compressive strength of the self-curing concrete "D" group (made with dolomite) is higher than the "LBA" group (with 70% light brick+30% Addipor as a replacement of light brick). It decreased by 82.1% after 28 days. ... The loss of its compressive strength compared to dolomite may be due to the higher number of voids …
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Physical parameters, tensile and compressive …
Physical parameters, tensile and compressive strength of dolomite rock samples: influence of grain size – DOAJ. Journal of Civil Engineering and Management (Nov 2020) …
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Study of concrete mix by adding Dolomite in
If cement is replaced with dolomite up-to a certain percentage an increase in strength can be noticed which means that it is both, efficient and cost effective at same time. • The compressive strength was noted as maximum when the cement replacement existed 15 % by dolomite. • The maximum flexural strength noted was at 15 % …
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