Alkali-Aggregate Reaction. In most concrete, aggregates are more or less chemically inert. However, some aggregates react with the alkali hydroxides in concrete, causing expansion and cracking over a period of many …
اقرأ المزيد
Objective of study to analyzing physical property of fresh concrete that is workability & compressive strength, flexural strength of hard concrete in M25 by adding …
اقرأ المزيد
The first crack blows of GGBS-dolomite geopolymer concrete were found as 2.3 times that of cement concrete. Maximum impact energy was observed for G80:D20, which is 21% more than cement concrete. G50:D50 less impact resistance compared to all other specimens. Variation of Impact energy along with the addition of dolomite, is shown in …
اقرأ المزيد
crushed stone output. Of the total domestic crushed stone produced in 2020, about 70% was limestone and dolomite; 15%, granite; 6%, traprock; 5%, miscellaneous stone; 3%, sandstone and quartzite; and the remaining 1% was divided, in descending order of tonnage, among marble, volcanic cinder and scoria, calcareous marl, slate, and shell.
اقرأ المزيد
1. Introduction. Cement is the most widely used construction material worldwide. Nevertheless, the cement industry faces environmental and energy challenges, including the following: 1) Generation of between 5% and 10% of the world's total anthropogenic CO 2 emissions [1, 2]; the production of cement releases 0.73 to 0.99 t CO 2 /t cement …
اقرأ المزيد
K.Chinnaraju et al. studied the effects of eco sand (extracted dolomite) as a partial replacement of fine aggregates in cement mortar and cement concrete. The study …
اقرأ المزيد
The formula they obtained composed by Portland limestone cement, recycled nylon fibers, and dolomite aggregates as raw materials was a high-performance concrete used as thermal storage material. ... As a result, the impact of steel slag aggregates on the mechanical properties of shielding concrete needs to be further investigated. Fig. 13 ...
اقرأ المزيد
The effectivity of the numerical model in simulating the impact behavior of concrete members and the behavior of FRP strengthened damaged RC beam was validated against experiments. ... It was observed that geopolymer concrete has 28% reduction in cost/ultimate load compared to ordinary concrete. GGBS-dolomite …
اقرأ المزيد
for hardness (resistance to abrasion and impact) and soundness (resistance to disintegration from weathering). Some stone has physical properties that make it suitable for skid-resistant material on roadway pavement. Limestone and dolomite aggregate are mixed with cement, sand, and water to make concrete,
اقرأ المزيد
The results had shown that tested concrete mortars with dolomite provided the increase of compressive strength of concrete, as well as tension breaking strength, and flexural …
اقرأ المزيد
As we can see, partial cement replacement with dolomite limestone powder results in compression strength increasing. Strength of samples containing 25% of dolomite limestone powder increased by 16.7% and 23.5% at 14 and 28 days age, respectively, in comparison with reference samples. Fig. 4.
اقرأ المزيد
Impact Resistance of GGBS-Dolomite Geopolymer Concrete P Saranya*, ... 544) [16] is the simplest method used for finding impact resistance of concrete. Recently [12], Geopolymer concrete was ...
اقرأ المزيد
The paper aims to understand the effect of light-burned dolomite powders (LBD) on ordinary Portland cement (OPC) and evaluate the influence of LBD dosages and fineness levels on the mechanical properties and hydration properties of OPC. The LBD/OPC pastes were prepared by OPC blended with LBD at various replacement …
اقرأ المزيد
A dolomite composite admixture preparation method and novel application; the dolomite composite admixture preparation method comprising: levigating dolomite to particles basically the same as silicate concrete; adding a specific proportion of dolomite powder by mass of silicate concrete; adding a specific equivalent amount of alkali …
اقرأ المزيد
This paper presents a study on the properties of concrete prepared with two aggregate types, namely gravel and dolomite. Various concrete mixes made with gravel and dolomite which blended with ...
اقرأ المزيد
Portland dolomite cement as alternative to Portland limestone cement. Proceedings of the 13th International Congress on the chemistry of cement, Madrid, Spain, 3-8 July 2011.
اقرأ المزيد
The present paper investigates the impact resistance of GGBS dolomite geopolymer concrete using. A Study on Effect of Crystalline Dolomite Abstract— This paper elaborates the effects of partial replacement of cement with crystalline dolomite silica in cement concrete. Concrete is a composite material composed of cement, aggr
اقرأ المزيد
Objective of study to analyzing physical property of fresh concrete that is workability & compressive strength, flexural strength of hard concrete in M25 by adding dolomite as partial...
اقرأ المزيد
Dolomite is characterized by two endothermic effects: at 800 and 950 °С. The first one is due to pre-calcining of МgСО contained in dolomite, and the second one is due to pre-calcining o f СаСО...
اقرأ المزيد
2.1 Materials. Here, type I Portland cement, according to ASTM C150 [], and clinoptilolite natural zeolite in accordance with ASTM C618 [] as an eco-friendly supplementary material were used.The features of the cement and zeolite pozzolan are presented in Table 1.Crushed dolomite limestone was used as the coarse aggregate in …
اقرأ المزيد
Replacing traditional aggregates and micro-fillers with dolomite by-product makes possible to obtain durable high-performance concrete with decrease …
اقرأ المزيد
Bhusare, "Experimental study on strength behavior of concrete by partial of effect on concrete properties with partial replacement of fine aggregate with copper slag and replacement of cement with dolomite powder," cement with silica fume," 2018 International journal for research in applied science and engineering technology, vol. 7, no ...
اقرأ المزيد
Use of dolomite powder decreases in the cost of concrete. D. The characteristic of dolomite such as Endothermic was found out at 810 o C because of CaMg (CO3) 2 and Endothermic effect found out ...
اقرأ المزيد
aggregates used in concrete mixtures have a major impact on its conductivity [22]. Considering the above, it should be stated that the aggregate morphology can significantly a ect the behavior of PCA. ... Dolomite aggregate can be used as an alternative to gravel aggregates in the production of simple concrete, as well as for floor, …
اقرأ المزيد
An Environmental Resource Permit (ERP) is also required for limestone, shell and dolomite mining projects. Environmental Resource Permitting standards are detailed in Part IV of Chapter 373, F.S., and Chapter 62-330, F.A.C. For mining activities that involve dredging or filling in state-assumed waters, a State 404 (dredge and fill) permit would ...
اقرأ المزيد
This study investigates the hydration of dolomite, CaMg(CO 3) 2, with calcined clay in presence of calcium hydroxide and ordinary Portland cement.The hydration products as well as the microstructure at various ages were characterized using X-ray diffraction (XRD), thermogravimetric analysis (TGA), and mercury intrusion porosimetry …
اقرأ المزيد
The dolomitization reaction of dolomite in the alkaline environment of the cement paste can cause the concrete to expand (Xu et al., 2021), which can improve its …
اقرأ المزيد
In general, it was found that the introduction of up to 30% of limestone or dolomite as cement replacement will greatly improve sustainability with tolerable effects on concrete properties or ...
اقرأ المزيد
concrete volume (70% to 85% by mass) and strongly influ-ence the concrete's freshly mixed and hardened proper-ties, mixture proportions, and economy. Fine aggregates (Fig. 5-1) generally consist of natural sand or crushed stone with most particles smaller than 5 mm (0.2 in.). Coarse aggregates (Fig. 5-2) consist of one or a com-CHAPTER 5
اقرأ المزيد
Concrete specimens were kept at room temperature 23 ± 2 °C and relative humidity for 24 h. The curing was carried out through immersing the concrete samples in tap water up to 180 days and part of these samples immersed in sodium hydroxide for 180 days. Mix design of kg/m 3 is given in Table 2. The dolomite concrete was replaced by NS.
اقرأ المزيد
5 Citations Metrics Abstract The present study focuses on utilizing stockpiled dolomite quarry waste for sustainable and cleaner production of concrete. Natural river …
اقرأ المزيد
This dissertation has been written in two parts: the chemical characteristics of Iowa highway concrete containing coarse dolomite aggregate, and an experimental study of deterioration of Iowa highway concrete;Two groups of Iowa highway concretes studied here can be differentiated: durable concretes with extended service lives of >40 years and non …
اقرأ المزيد
Dolomite production waste is a by-product generated by dolomite mining, causing environmental pollution and other associated issues worldwide. In this experimental study, the use of the dolomite production waste in concrete was investigated, which has not been explored yet in any past literature studies. Natural river sand was substituted …
اقرأ المزيد
Section snippets Experimental. Dolomite was waste dust from a dolomite quarry in Hubei, China (CO 2 45.93%, CaO 30.27%, MgO 23.78%, Al 2 O 3 0.13%, Fe 2 O 3 0.06%, P 2 O 5 0.03%). The alkali activator consisted of sodium hydroxide and liquid sodium silicate (molar ratio SiO 2 /Na 2 O = 3.1). AD specimens were prepared via alkali …
اقرأ المزيد
Dolomite, or dolostone, is a carbonate sedimentary rock made mostly from the mineral dolomite, CaMg (CO3)2. It commonly occurs in association with limestone and shares many of the same properties, but reacts only weakly with acid. Dolomite often has a sugary texture and is typically off-white to gray in color.
اقرأ المزيد
aggregates used in concrete mixtures have a major impact on its conductivity [22]. Considering the above, it should be stated that the aggregate morphology can significantly a ect the behavior of PCA. 2. Research Significance In the design process of concrete, relatively little attention is paid to the geometry of aggregate.
اقرأ المزيد