Nigeria is rich is solid mineral resources, such as: Kaolin, gypsum, mica, clay, tantalite, iron ore, gemstone, silica sand.
Read More
Recycling concrete &building rubble is not only able to bring profit to investors, but also good for environment protection.
Read More
By absorbing the advanced technology from the world, we researched and designed PF series impact crusher.…
Read More
Base on the plentiful experience of producing and marketing of impact crusher, Sofol R&D institution…
Read More
Adopting technology from the world, PY Series spring cone crusher has an excellent performance in secondary…
Read More
The vibrating screen is a kind of sieving equipment of international advanced level, developed by our…
Read More
Sofol VSI Series vertical shaft impact crusher is designed by reputed German expert of Sofol and every…
Read More
Exposed aggregate concrete is concrete that displays stones, pebbles, sand, recycled glass, or shells in its design. It comes in a range of colors, textures, and styles. ... Exposed aggregate costs $2 to $3 more per square foot than standard concrete. More difficult to repair: Due to the intricacy of the design and installation method, ...
Details
a, and a. in cement stone and aggregate due to 1 deg C of temperature variation have been compiled and are shown in Figures 1, 2, and 3. Because temperature variation may be considered as an instantaneous effect, zero rate of creep ip has been assumed. The important relationships on the basis of the elasticity equations are given below: 1.
Details
Download Citation | Mechanical properties of recycled aggregate concrete surface treated by variation in mixing approaches | Increased demand for natural aggregates (NA) due to infrastructural ...
Details
Aggregates contribute to 60 to 70% of the volume of concrete, and form the main skeleton of concrete. Aggregates, due to their shape, texture and proportioning influence the fresh state properties like workability, segregation, temperature retention, hardened state properties, durability and porosity.
Details
This variation could be attributed to low aggregate strength and the variation of the volumetric ratio of the course aggregate (some grades have coarse aggregate within their distribution). Rapid chloride penetration test (RCPT) Ability of concrete to resist chloride ion penetration at 60 voltage direct current (VDC) and 6 h of …
Details
The inclusion of fiber in concrete influenced the mobility of concrete in the fresh state by acting as a barrier to the movement of coarse aggregate. It was observed that the concrete with an FA/CA ratio above 0.8 showed better flowability in the fresh state, whilst an above 0.9 FA/CA ratio requires excessive superplasticizer to maintain the ...
Details
XPERIMENTAL STUDY OF STRENGTH OF CONCRETE DUE TO VARIATION IN TEMPERATURE OF WATER. 4.1 Materials and mix proportion . Ordinary Portland cement of grade 53was used in the concrete mixture. Locally available aggregates were used in the research. Tap water available in the laboratory was used for mixing as well as for
Details
As building construction speeds up, demolitions will increase due to concrete's limited lifespan ultimately ending in demolition. In earthquake-prone countries like Nepal, buildings may collapse during earthquakes, leading to the disposal of bricks creating potential environmental pollution. This research explores the use of Crushed …
Details
This considerable variation is caused by properties of used lightweight aggregates. ... The decrease in concrete compressive strength due to vermiculite addition (SFA concrete and SFA + EV concrete) equals 21.9; 30.9 and 33% for specimens that are moist, wet and after frost resistance testing, respectively. ... In ordinary concrete, …
Details
Amplitudes Variation of GPR Rebar Reflection Due to the Influence of Concrete Aggregate Scattering Thomas KIND Federal Institute for Materials Research and Testing, Berlin, Germany ... In a systematic study we have quantified the statistical variation of the rebar reflection amplitude for concrete covers of 6 cm, 9 cm, 12 cm, 15 cm and 18 cm ...
Details
Slumps in excess of this can lead to a highly porous concrete (more prone to colour fade), and also likely to lead to coarse aggregate segregation. This can lead to a variable dispersion of aggregates, which can be an aesthetic issue in exposed aggregate concretes. 3. No water should be added after a portion of the load has been discharged.
Details
🕑 Reading time: 1 minute Alkali aggregate reactions (AAR) occur when aggregates in concrete react with the alkali hydroxides in concrete producing a hygroscopic gel which, in the presence of moisture, absorbs water and causes expansion and cracking over a period of many years. This alkali-aggregate reaction has two forms, namely: Alkali-silica …
Details
In addition, the traditional construction industry consumes large amounts of natural resources, including natural sand and natural coarse aggregate (NCA). Crushing waste concrete as recycled coarse aggregate (RCA), recycled fine aggregate (RFA) and recycled powder (RP) to produce recycled aggregate concrete (RAC) not only releases …
Details
The variation of carbonation depths can have a significant influence on the corrosion initiation time and the average cross-sectional area loss ratio of the steel reinforcement [3].Such variation may be caused by the random distribution of coarse aggregate (CA), since it induces a tortuous path for CO 2 transport in concrete [4], [5], …
Details
The present study focuses on identifying suitable and sustainable waste materials in concrete by replacing for coarse aggregates. Investigations have been conducted to determine how well the inappropriate wastes, palm kernel shells, periwinkle shells, and coconut shells perform as substitute for coarse materials in concrete.
Details
The results of analysis show that with an increase in the transport emission from natural aggregates, binder-to-total aggregate (b/a) and water-to-binder (w/b) respectively increases and decreases to account for the binder variation due to waste aggregate utilization (e.g., see green and orange lines in subplots for b/a and w/b in Fig. …
Details
Concrete comprising SCMs displayed a statistically significant increase in compressive strength variation and a general decrease in compressive strength predictability against mixtures without SCMs when a cement source was changed, and specific aggregate/cementitious material combinations influenced compressive strength …
Details
In this paper, concrete mixes utilizing two sizes of natural aggregate and two sources of lightweight and recycled aggregates were used to investigate the effect of aggregate …
Details
The use of fine aggregate in pervious concrete mixture is limited due to the fine aggregate can block the interconnected pores thus lowering the permeable ability of the pervious concrete. The objective of this research is to analyze the characteristics of the pervious concrete which is compressive strength, permeability, and porosity with ...
Details
In addition, BPG-5S had a compressive strength of 6.86 MPa, which is strong enough to satisfy the requirements in the American Concrete Institute standard (2.8-28.0 MPa) [35] and also suitable as ...
Details
This paper investigates porous concrete and the influence of water level variations and porosity on the mechanical, physical, and hydraulic properties of porous concrete. The effect of different void percentages and various water levels on the properties of porous concrete was studied. Fabricated specimens with targeted …
Details
Clarified aggregate effect on concrete mechanical behaviours. •. Explored the fracture mechanism based on crack growth rate in concretes. Abstract. Mechanical properties of …
Details
Non-conventional aggregate-based concrete may exhibit different thermal responses compared to conventional concrete due to variations in mineral composition, porosity, and microstructure 16 ...
Details
According to Dahal et al., [25], the increase in the slump value due to the smallest size aggregates filling the voids caused by larger size aggregates. They also stated that this can result in ...
Details
This is because it is relatively inexpensive and widely available. Although widely used, concrete made using brick aggregates are weaker and proven to have lower durability than those made using ...
Details
1. Introduction. The alkali-aggregate reaction (AAR) is a chemical reaction that occurs in concrete. Reactive silica in aggregates reacts with the hydroxyl ions in the pore solution of mortar, forming AAR gel, which is characterized by dilation properties, triggering interior tensions in concrete [1].Microcracks caused by interior tensions …
Details
Some variation in the type, quality, cleanli-ness, grading, moisture content, and other properties is expected. Close to half of the coarse aggregates used in portland cement …
Details
Waste rubber tyres can be effectively consumed as partial replacement for fine aggregate in concrete. ... causing compactness variation in microstructure and reduction in mechanical properties [8], ... One possible reason for this is the increase of pore sizes in concrete due to larger w/c. When exposure duration increased from 28 to …
Details
🕑 Reading time: 1 minute Adjusting the slump of concrete is a part of the concreting process, which the contractors should manage properly and cautiously. The concrete slump variation from one transit mixer to another is generally due to aggregate moisture content, concrete temperature, mixing process; and time of delivery, waiting, and unloading. …
Details
The shape and texture of aggregate affects the properties of fresh concrete more than hardened concrete. Concrete is more workable when smooth and rounded aggregate is …
Details
There is considerable variation in physical and mechanical properties of RCA, which primarily depends on the amount and quality of 'adhered mortar' (an undesirable old mortar adhered to stresses-sustained natural aggregates). ... In general, the density of RAC is lower than that of natural aggregate concrete due to the …
Details
It stands to reason, therefore, that it is due to the aforementioned findings that the relevant ACI code recommends that concrete aggregates for use in primary concrete containment structures should have a low coefficient of thermal expansion but not so low that incompatibility with the cement matrix can lead to cracking at the aggregate/matrix ...
Details
Aggregate transparency is when the dark areas of the mottled effect correspond with pieces of coarse aggregate near the form face. This is caused when, during vibration, fine particles, including cement, form a very thin layer over the aggregate in the narrow gap between the particles and the form face. ... Variations in the shade of …
Details
The variation in substitution rate may be due to changes in aggregate quality. However, using fully saturated RA mixed with NA in concrete formulations can balance material strength and curing effects, making this method worth promoting. Efficiencies affecting internal conservation can be broadly categorized into three …
Details
Sofol is a well-known crusher and grinding mill manufacturer that offers equipment and solutions for customers from aggregates, mining and mineral grinding industry.
You can leave your message here, we'll send you an Email immediately.
Online ChatCopyright ©2000- 2024 Shanghai Sofol CompanySitemap
PE series jaw crusher is usually used as primary crusher in quarry production lines, mineral ore crushing plants and powder making plants.
GET QUOTE