The addition of a mineral additive to Portland cement involves an increase of the setting time allotted to the dilution effect (dilution of the most active ingredient) and to the increase in the necessary water to prepare a normal consistency paste. In this study, ordinary cement was substituted by 5, 15 and 25% of limestone powder, 10, 20 and …
Admixtures are chemical additives in concrete and play a vital role in modifying the desired properties in fresh concrete or green concrete. The evolution of these admixtures in their performance contributed a lot …
Key Words: Concrete, Fine Additives, Carbon Black, Gypsum, Sunla Gypsum, Rice Husk Ash. 1. INTRODUCTION Concrete is a mixture of naturally, cheaply and easily available ingredients as cement, sand, aggregate and water. Cement is occupied second place as most used material in the world after water. The rapid production of cement
Additives in cement serve as versatile tools for engineers and builders, allowing them to tailor concrete mixes to meet specific project requirements. Whether addressing workability, strength, durability, or environmental concerns, the judicious use of additives is essential for achieving optimal
The present work reviews the various mineral admixtures used in concrete which modifies the concrete properties. In this study, cement is partially or completely replaced by different mineral admixtures such as fly ash, silica fume, rice husk ash, Ground Granulated Blast Furnace Slag, palm oil fuel ash and metakaolin. The strength obtained …
Cement additives are materials added to cement for the optimization of the cement properties and the cement grinding process. Cement additives are classified into different product groups such as grinding aids, strength enhancers and performance enhancers. ... The effect of grinding aids on the comminution of cement is based on the dispersion ...
Measurement of radon emanation factor from granular samples: effects of additives in cement Appl Radiat Isot. 2004 Jan;60(1):49-54. doi: 10.1016/j.apradiso.2003.10.004. ... Measurements of radon emanation factor of cement and pozzolanic additives, i.e. fly ash and phosphogypsum were also performed. MeSH terms
The influence of both organic and inorganic additives to calcium aluminate cement on the processes of hydration and structure formation of concrete both at normal and elevated temperatures is investigated here. The results of investigating phase transformations in hardened calcium aluminate samples during heating from 20 to 900°C …
2.Silica (SiO 2) Silica or silicon dioxide is the second largest quantity of cement ingredients which is about 17 to 25%. Silica can be obtained from sand, argillaceous rock etc. Sufficient quantity of silica helps for the formation of di-calcium and tri-calcium silicates which imparts strength to the cement.
The body of literature on concrete using mineral admixtures covers a number of review studies on the durability characteristics of various materials used in concrete, such as fly ash (FA), rice ...
A study compared the effect of curing age in cement and lime-stabilized soils, and found that the most significant changes occurred after 1 h curing period, and subsequent changes were marginal (Christensen 1969). In the initial stages of curing, cementitious hydration reactions are prominent in cement-based additives that …
Graphene oxide (GO) effect on concrete compressive and flexural strength development over the period of 28 days [135]. ... Graphene offers great potential as a …
In addition to cement, sand, gravel, and water, the current investigation of the influence of additives on the compressive strength of concrete at 28 days includes …
Overview on Cement and cement types, its manufacturing process and mineral additives. Looking for cements and cement additives? Cement is a binding that sets, hardens, and adheres to …
Future Trends in Concrete Additives. The field of concrete additives continues to evolve, with ongoing research and development aiming to enhance concrete performance and sustainability further. 6. …
Nano-silica (nS) or silica nanoparticles, also known as silicon dioxide nanoparticles, can be used as additives for improving concrete's mechanical and durability properties [24], [25], [26].The effect of nS on nanostructure of cement paste also confirmed the improvement in concrete durability [27].The results revealed the nS as an excellent …
In some cases, they catalyze the C3S hydration reaction to produce earlier initial set and strength. Cement additives with retarding properties improve the flow and set properties of cement. Na/Ca …
These additives are most efficient during the cold seasons. Calcium chloride is used as the accelerating additive on non-reinforced concrete. Air-Entrainment. These additives are used to introduce microscopic air bubbles to stabilize the concrete. The resultant effect is preventing the concrete from cracking in a cold environment.
Effects of Additive Concentrations on Cement Rheology at Different . Temperature Conditions. Ikpeka Princewill Maduabuchi 1, Odo Jude Emek a 1, Benedict Ugochukwu Wisdom 1, Utojiuba Ifeanyi D avida 1,
Three different ratios used in this research, which is 3%, 4% and 5% of coconut coir fibre as an additive to the concrete. There will be two types of specimens, which are cube size of 100mm x 100mm and cylinder 100mm diameter with 200mm length. ... Effect of Epoxy Resin on CBR Improvement of Soft Clayey Subgrade Mixed with …
Cement production is one of the most energy-intensive and highest carbon dioxide (CO2) emitting manufacturing processes. In fact, the cement industry alone accounts for around 7% of total anthropogenic CO2 …
Little formal work has been done to analyze the behavior of the Mexican cement industry in detail. The most germane studies have focused on analyzing the overall nature of the …
In this research, it was studied the dossing effect of nopal mucilage and Ixtle fiber as additives for the enhancement of concrete's mechanical properties: compression strength, flexural strength ...
Fig. 3 displays the density ranges of different cement classes together with the impacts on the density of certain cement additives. Aerated cement has a density …
Fig. 3 displays the density ranges of different cement classes together with the impacts on the density of certain cement additives. Aerated cement has a density in the range of 0.5–1.92 g / c m 3, whereas cement with a weighting agent can reach densities of up to 2.52 g / c m 3, depending on the weighting additive involved [42], [43], …
1. Introduction. Many studies have been carried out on natural and bio-additives to reduce the cement usage rate in the preparation of cementitious composites [1].Akindahunsi [2] examined the effect of starch extract from cassava and maize on concrete properties and it was found that starch has a positive effect on the long-term …
Little formal work has been done to analyze the behavior of the Mexican cement industry in detail. The most germane studies have focused on analyzing the overall nature of the industry (Avalos and Schatan, 2003; Kumakan and Martínez, 2008), analyzing the efficient use of energy in production (Sterner, 1990), the market structure by which the industry …
This discovery signaled potential for using nano-scale additives to modify the properties of cement-based materials, because polymeric networks of C-S-H serve as the structural "glue" of concrete and other cement products [1]. Similar effects were observed for ordinary portland cement (OPC) paste by Nelson and Young in 1977 [4]. In …
The concrete in this study was enhanced with key additives from reputable suppliers. Silica Fume, sourced from Astrra Chemicals in Mumbai, India, boasted an impressive 95% Silica (SiO 2) content ...
By adding the mentioned concrete additives (water reducer, set retarder or accelerator, binder, etc.) into the concrete matrix, physical and chemical modifications …
Pozzolanic effect of active mineral additives in concrete. The materials chosen are silica fume as active mineral additives (Tangshan Steel Co, Tangshan, China) and OPC of Chongqing Cement Plant mark 525R as cementitious material. Their chemical compositions are shown in Table 1.
Ordinary Portland cement (OPC) is the core ingredient of many construction materials. In 2022, 4.1 billion tons were used worldwide, contributing to ~8% of CO2 emissions ( ~ 3 Gt/year).
Request PDF | On Nov 25, 2020, Nahla Abd El Ghaffar and others published Effect of granite weathered granules additives as aggregates in cement concrete | Find, read and cite all the research you ...
Chile, Argentina, Morocco, Italy, and the USA; and it is, along with corn, a staple food in Mexico (Arreola-Nava et al., 2017; López-León et al., 2019; Martínez et al., 2018). Different nopal species have been studied to determine their chemical composition to understand its properties and ... Effect of natural additives on concrete ...
The effects of different asphalt additives on creep-strain for pavements with heavy use, such as highways, were discussed in (S [18]. In this work, reclaimed cement from factory waste was added as a mineral filler to HMA mixes in various percentages. The MM was used to prepare a cold-mix asphalt emulsion mix course.
resultant effects on cement properties. The review also highlights the importance of understanding the interactions between additives and cementitious components to …
Cement (either Type I or Type II), aggregates, and admixtures materials shall be subjected to the following test methods: water wettability; alkali resistance; percentage of sulfates; water solubility; atmospheric curing stability; light resistance; effects on concrete, which include preparation of mixtures, making and curing, time of setting ...
Steps B & C: By adding an amount of 7.5% of glass powder to mixture B, there was a high increase of workability for mixture C and a significant increase of slump (20 cm in the case of 350 kg cement and 18.5 cm for the case of 400 kg cement) with increase of strength in order of 11% for 350 kg cement but an unexpected slight …
The most common cement weighting agents are as follows: Ilmenite; Hematite; Barite; Manganese tetraoxide. In the Cement Weighting Agents article, we have handled the common chemicals, mechanisms & side effects of each agent.. Cement Dispersants Additives. Treatment with a dispersant aims to reduce the viscosity of the …
In this research, it was studied the dossing effect of nopal mucilage and Ixtle fiber as additives for the enhancement of concrete's mechanical properties: compression strength, flexural strength, heat transfer coefficient, ultrasonic pulse rate, ED-XRF, and roughness …