In addition, using rough lightweight aggregate led to reduce the water absorption and cumulative volume of water absorbed by about 9% and 12%, respectively, compared to values of mix with original (smooth) LWA. 1. Introduction Concrete is an extensively used construction material due to availability of its raw materials and its good properties.The strength of lightweight aggregate directly affects the compressive strength of concrete because the aggregate compressive strength is much lower than the strength of cement paste. …

Aggregates shape and size has a strong influence on properties of concrete. Rough surface textured particles increase the compressive strength of concrete up to 20-30%, instead of …Moreover, coarse aggregate is the source of concrete strength, controls its cost, resist weather conditions and has direct effect on concrete quality. While, fine aggregate (sand) is to filling the gaps between coarse aggregate and increase concrete workability.

Coarse aggregate is major constituent of concrete impacting on strength, thermal & elastic properties, dimensional stability & volume stability. The aim of this study was to investigate the coarse… Expand PDF Study the Impacts of Aggregate's Geometry and Cement Contents on Fresh and Hardened Properties of ConcreteAbstract and Figures Aggregates constitute more than 90% of concrete and significantly determine the strength of concrete. In this study, the shape characteristics such as flakiness …

The effects of aggregate type, size, and content on the behavior of normal and high-strength concrete, and the relationships between compressive strength, flexural strength, and fracture energy are discussed. The concrete mixtures incorporate either basalt or crushed limestone, aggregate sizes of 12 mm ('h in.) or 19 mm (:Y. in.), and coarse aggregate contents …Also, the results show that the compressive strength increases with increasing aggregate size up to 12.5 mm, while the concrete produced using 20 mm had greater compressive strength than those produced using 25 mm aggregate. This established the importance of ensuring that the right aggregate size is used in the production of concrete.

Walker and Bloem (1960) and Bloem and Gaynor (1963) concluded that an increase in aggregate size results in a decrease in the compressive strength of concrete. Cook (1989) showed that, for compressive strengths in excess of 69 RvfPa (10,000 psi), smaller sized coarse aggegate produces higher strengths for a given water-to-cement ratio.This indicates that the mix design had reached the ceiling strength of the aggregate. For concrete using high strength aggregate (15 mm) and a low w/c ratio (0.4), the concrete strength …

Abstract and Figures Aggregates constitute more than 90% of concrete and significantly determine the strength of concrete. In this study, the shape characteristics such as flakiness and...Aggregates: Quality of aggregates, its size, shape, texture, strength etc determines the strength of concrete. The presence of salts (chlorides and sulphates), silt and clay also reduces the strength of concrete. Water: …

The effect of very fine aggregate on the water requirement and strength evolution of superplasticized concrete was studied. The maximum aggregate size was 6 mm, fine aggregate content 0–15% of the total aggregate, binder (OPC and silica) content 80–800 kg m −3, and specific surface area of the finest aggregate material 18–1000 m 2 kg −1.A. When the w/cm is the same and the mixtures are plastic and workable, considerable changes in grading will not have a large effect on concrete strength. The principal effect of changing the aggregate grading is to change the amount of cementitious material and water needed to make the mixture workable with the desired w/cm. References: SP-1 ...

The shape of aggregate affects the workability of the concrete to a great extent, hence its strength and durability. Shape affects compressive strength by 22% and flexure strength by 30%. Flaky Particle: A particle is said to be flaky, if its least dimension (thickness) is less than 0.6 times the mean sieve size.The effect of physical properties of recycled aggregate such as water absorption, impact value, aggregate, abrasion value and aggregate attrition value on the compressive strength were interpretated as shown below: Table 5: Variation of compressive strength (Mpa) Graph 5: Variation of compressive strength

Aggregates shape and size has a strong influence on properties of concrete. Rough surface textured particles increase the compressive strength of concrete up to 20-30%, instead of using natural gravels that is obtained from river beds. Rough surface have pores which have ability to form bond or create resistance against the applied load.For this reason, investigating the effect of the concrete constituents, such as aggregates, on its mechanical and durability properties is of great importance. Aggregates make up between …

If, however, the two mixes are designed for the same slump and workability, and with the same cement content, the mix with l/2-inch aggregate is likely to be somewhat stronger, because its water-cement ratio will be lower. However this increase in strength may not be significant because of other factors that affect strength. About the AuthorIn general, cement is considered one of the highly influential factors affecting strength of concrete. Aggregates Aggregate is the material bond with the cement paste after reacting with water. Therefore, the quality of the aggregate …

III. LITERATURE REVIEW 1) Mohad Fedder Musa, A. Aziz bin Saim (2017): The results shows that the concrete aggregate size of 20 mm has a 45.7% higher compressive strength than the …Effect of Coarse Aggregate on Strength of Concrete Coarse aggregate makes up about 75% of concrete by volume. Strength of concrete is also affected by the properties of coarse aggregates besides water-cement ratio and other …

Effect of aggregate type on Compressive strength of concrete M. Abdullahi Materials Science 2012 The utilisation of three types of aggregate for concrete work is investigated in this paper. Normal concrete is being produced from different types of aggregate and this imparts different property to… 95 PDFWhen aggregates with high strength properties are used to make concrete, it gains higher strength in almost all cases than the concrete made by aggregate with weaker strength values …