This study investigated the effects of substituting magnesium oxide (MgO) with dolomitic limestone (DL) on the mechanical and physical properties of magnesium oxysulfate (MOS) cement. Additionally, the hydration formation phases and the influence of the molar ratio on the MOS cement's performance were examined. The corresponding action mechanisms …
This study concerns the influence of chemical corrosion and geometric parameters on the macroscopic damage characteristics of brittle limestone containing a kinked fissure under uniaxial compression.
Here, the effects of acid on wormholes propagation in limestone and dolomite reservoirs at different injection temperatures are simulated, where the injection velocity is 0.005 cm/s, acid injection amounts are 4.5 PV, the reservoir temperature was 433 K, and the acid injection temperatures were 298 K, 338 K, 378 K, and 418 K. Details of the ...
To know the sustainable performance of calcium-based adsorbents is one of the important aspects to realize efficient and economical carbon capture, and to systematically study the properties of natural adsorbents is conducive to their industrialization. The cyclic calcination and carbonation characteristics of a typical natural limestone were investigated using a thermal …
The present work illustrates the effect of limestone and dolomite as flux material in ... The cracked pellets increase the generation of fines during the screening or handling process [11,12]. These fired pellets are reported out of the quality standards in terms of physical properties such as higher abrasion index and reduction degradation ...
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This study concerns the influence of chemical corrosion and geometric parameters on the macroscopic damage characteristics of brittle limestone containing a kinked fissure under uniaxial compression. The specimens are prepared in chemical solutions with different NaCl concentrations and pH values. The acoustic emission (AE) technique is adopted to detect the …
The effects of limestone replacement fraction, limestone specific surface area and water-to-binder (W/B) ratio on the threshold chloride concentration (TCC) for steel corrosion were evaluated. XRD and SEM analyses were conducted to examine the crystalline phases and microstructure of limestone-blended cement paste, respectively.
Acids have a corrosive effect on limestone or marble buildings or sculptures. It is well established that either wet or dry deposition of sulfur dioxide significantly increases the rate of corrosion on limestone, sandstone and marble. Limestone deposits can be found in: Water pipes; Water heaters; Hot water tanks; Heat exchangers; Hot water ...
The results show that the peak strain and peak strength of limestone exhibit more significant dete-rioration with lower pH acid and longer corrosion time.
In this paper, several mechanical deformation curves of limestone are reviewed, and the effects of temperature, confining pressure, and fluid are discussed. Generally, Mohr–Coulomb is used for limestone brittle fracture. The characteristic of low temperature cataclastic flow and the conditions and constitutive equations of intracrystal plastic deformation …
Mechanical properties and microscopic damage characteristics of coal-series limestone under real-time coupling effects of high temperature and impact August 2024 DOI: 10.21203/rs.3.rs-5002876/v1
This was the primary cause for limestone corrosion, and the release of Ca and Mg from the rock and its disintegration. ... where the specific isolation process, screening, and identification ...
Problems with corrosive water can be solved using a variety of approaches. These include replacement of plumbing system components, treating water to make it less corrosive, or reducing the products of corrosion …
Limestone has always been widely used in various sectors, thus having significant economic and environmental impacts. The quarrying process is, on the one hand, essential, but on the other, harmful to the environment and people's health, therefore, the challenge is finding a balance. This review explores the multifaceted nature of limestone, a sedimentary rock …
In this paper examines the improving durability of different limestone cement and effects of the use of corrosion inhibitor. The target is to experimentally investigate the effect of different types of cement in corrosion of reinforcement in presents of corrosion inhibitors and without it. Three types of cement have been used: CEM II, LC1 and LC2. For this purpose constructed mortar …
Effect of an acid rain environment on limestone surfaces. ... Jr, M F. As part of a study to assess mineralogical alterations in building stone caused by acid rain, Salem limestone samples were exposed for one year in several urban and one rural environments. Samples exposed in the rural location were chemically indistinguishable from the ...
and N02 has a corrosive effect on calcareous stone materials (Johansson et aI., 1988). The total corrosive effect of acid rain cannot be determined unequivocally since it has both corrosive and washing effects. Thus in heavily polluted industrial air the corrosion rate on the upper side of steel panels was only 37% of the total corrosion.
Effects of LS from different sources on the workability of concrete were compared in [31].From Fig. 3, it can be seen that limestone from quarry waste (QLS) reduced the spread flow values of concrete, but those produced by direct grinding (PLS) increased the flow values of concrete which were mainly attributed to the surface morphology and fineness of the particles.
The rate of soil exposure to acid rain has been accelerating over the past few decades. The composition of acid rain is complex and the harm is great (Rao et al., 2016; Pervez and Pandey, 1990 ...
The results of the corrosive influence of chemical solutions with different pH values and immersion periods on the mechanical property degradation of limestone samples are …
Concrete has become the most widely used civil engineering material in the world due to its low cost, easy availability, and good modeling performance [1], [2].And the cement is an essential component of concrete, but producing 1 ton of cement clinker releases about 0.85 tons of carbon dioxide [3].In response to the increasing climate change problem in recent years, …
Acid-loving plants like camellias, azaleas, blueberries and centipede lawns grow best with a soil pH of 5.0 to 5.5. But most plants prefer a higher pH of about 6.5 to thrive. Before adding lime to the soil, test it for alkalinity by taking samples from three to five areas in the yard about 6 inches deep. ... Retrieved from https:// ...
In this paper, the acidification simulation experiment of hard limestone is used to study the acid corrosion effect and acid-rock reaction characteristics of limestone. The …
limestone eroded by an acidic solution, and analyzed the change characteristics of limestone pores, micromorphology, and mineral composition, with the degree of corrosion damage taken …
This work aimed to evaluate the effects of limestone powder (LP) replacement fraction (8–24 wt%) on chloride diffusion and chloride threshold (Cth) for corrosion initiation.
The results show that the peak strain and peak strength of limestone exhibit more significant deterioration with lower pH acid and longer corrosion time.
Explore the durability of limestone cement and the impact of corrosion inhibitors on reinforcement corrosion. Discover the effects of different cement types and inhibitors on corrosion potential, current, and mass loss. Find out how CEM II cement outperforms limestone cement in terms of durability, and how VpCI enhances corrosion protection by 50% in CEM II cement and up to …
The analysis indicates that the strength of limestone decreases due to the dissolution of chemical solutions under chemical erosion. The salt effect and the common ion effect …
The effects of limestone replacement fraction, limestone specific surface area and water-to-binder (W/B) ratio on the threshold chloride concentration (TCC) for steel corrosion were evaluated.
This study aims to examine the impact of acid corrosion on the mechanical properties and fractal characteristics of limestone. The mineral composition of the limestone was determined using XRD testing. The mechanical properties and acoustic emission signals of limestone, which were corroded using a sulfuric acid solution at pH = 1 for 30, 60, and 90 days, …
Limestone samples collected from different locations have been characterised using IR spectroscopy, X-ray diffraction, energy dispersive X-ray spectroscopy and Brunauer-Emmett-Teller analysis and correlated with their fluoride removal abilities by phosphoric acid (PA)-crushed limestone treatment (PACLT). The effects of varying initial fluoride ...
For the LC1 the protective effect is lower. The corrosion protective effect of mortar with CEM II cement is compared with the general opinion that the corrosion inhibitors duplicate the technical service life of concrete [4,9,14]. On the other hand, the corrosion protective effect of mortars with limestone cement has lower protective effect.
The "superposition effect" of limestone powder, fly ash, and slag can improve the frost resistance of CLP concrete. The scenario of salt freezing cycles has negative effects that are worse than those of water freezing cycles on the antifreeze performance of CLP concrete, including apparent morphology, mass loss, relative dynamic modulus of ...
Results of a corrosion study involving exposure of galvanized and black pipe specimens for five years in various backfill materials are reported. Backfill mater i a 1 s used included slags, limestone and grave 1 s, native soil and coal cinders. Corrosion of the pipe, considering the variability inherent in
The metal concentration of an acid solution has a significant effect on the neutralization rate of that solution. Dissolved iron in acid mine drainage not only coats limestone surfaces and hinders dissolution rates,but iron hydrolysis and precipitation reactions increase the required neutralization time. Our objective was to develop an empirical model for the neutralization rate of acid mine ...