Study of recycled concrete aggregate quality and its relationship with recycled concrete compressive strength using database analysis This work studies the physical and mechanical properties of recycled concrete aggregate (recycled aggregate from concrete waste) and their influence in structural recycled concrete compressive strength.
Overall Strength of a structure such as flexural resistance and abrasion directly depends upon the compressive strength of concrete. According to Wikipedia, Compressive Strength of concrete is defined as the Characteristic strength of 150mm size concrete cubes tested at 28 days.
For concrete with a compressive strength of 3000 psi, the corresponding calculated tensile strengths using these four approximations are 300, 367, 219 and 478 psi, respectively. The type of coarse aggregate in the concrete also significantly affects the compressive/tensile strength relationship.
Shape And Size Effect On Concrete 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.
The compressive strength and nondestructive tests were carried out at ages of 3, 7, 14, 28, and 90 days. Analysis of variance (ANOVA) was used to investigate the importance of different parameters on the results of the compressive strength and nondestructive tests.
Depending on the aggregate, differences of 40 percent in flexural strength and 29 percent in compressive strength were obtained for concrete of the same mix proportions. Statistical analysis indicated that the shape, surface texture, and modulus of elasticity of the aggregates were the main causes of variation in concrete strength.
coarse aggregates in high strength concrete Given the critical role that the interfacial transition plays in high-strength concrete, the mechanical properties of coarse aggregate will have a more pronounced effect than they would in conventional-strength concrete.
Normal strength concrete made with basalt and gravel gave similar compressive strength while the concrete containing limestone attained higher strength. The effects of content and particle size distribution of coarse aggregate on the compressive strength of concrete have been investigated (Meddah, Zitouni, and Belâabes 2010).
Input variables of the fuzzy logic model were the water to cement weight ratio and coarse aggregate to fine aggregate weight ratio, whereas the output variable was 28 days concrete compressive strength (CCS). Another study investigated effects of these input variables on the compressive strength of various ages of the concrete .
fine aggregate, while the concrete containing grit with a water-cement ratio of 0.45, produced a maximum compressive strength of 29.56 N/mm3 at the aggregate in one of the concrete mix, produced the least compressive strength of 17.33 N/mm3. Table 3: Compressive Strength Results of different Concrete Specimens
This chapter has been prepared with the hope that its readers will become interested in lightweight concrete (LWC). Therefore, after a brief background of lightweight concrete, different types of LWC will be introduced and then LWC made of lightweight aggregates (LWA) will be specifically discussed. Compressive strength and density of LWC are the main points of interest in this chapter.
Jun 10, 2019· The aggregate size is an important factor influencing the compressive strength of pervious concrete. This work is focused on the study of the relationship among aggregate size, compressive strength, pore structure, cementitious paste thickness, and then understanding the influence of aggregate size on the compressive strength of pervious concrete.
This paper discusses the suitability of producing concrete with 100 % recycled aggregate to meet durability and strength requirements for different applications. Aggregate strength, gradation, absorption, specific gravity, shape and texture are some of the physical and mechanical characteristics that contribute to the strength and durability of concrete.
However, aggregate characteristics other than strength, such as the size, shape, surface texture, grading and mineralogy are known to affect concrete strength in varying degrees. Size: The maximum size of a well-graded coarse aggregate of a given mineralogy can have two opposing effects on the strength of normal concrete.
May 07, 2019· ABSTACT. This report studied the comparative analysis of concrete made with two different type of aggregate. The utilization of two different types of coarse aggregate was investigated by testing and comparing their compressive strength.
Test for compressive strength is carried out either on cube or cylinder. Various standard codes recommend concrete cylinder or concrete cube as the standard specimen for the test. American Society for Testing Materials ASTM C39/C39M provides Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens.
Sep 03, 2014· When we design mix the concrete, its target strength is much less than the compressive strength of the aggregates used in the formation. It can also be clearly seen in the mix design procedure that greater the maximum size of coarse aggregate use...
Influence of Lime Stone Aggregate on Compressive Strength. The compressive strengths for all mixes are presented in table4.2 and Figures 4.2. From this, it can be observed that the 28 days compressive strength decrease with the increase in the percentage of lime stone up to .
The compressive strength of concrete depends on the water to cement ratio, degree of compaction, ratio of cement to aggregate, bond between mortar and aggregate, and grading, shape, strength and size of the aggregate (Roccoand Elices, 2009; Elices and Rocco, 2008).
The capacity of concrete is reported in psi – pounds per sq. inch in US units and in MPa – mega pascals in SI units.This is usually called as the characteristic compressive strength of concrete fc/ fck. For normal field applications, the concrete strength can vary from 10Mpa to 60 Mpa.
In very high-strength concrete mixtures (greater than 70 MPa) the crushing strength of the aggregate can be a limiting factor to the ultimate compressive strength. In lean concretes (with a high water-cement ratio) the crushing strength of the aggregates is not so significant.
aggregate sizes on the compressive strength of concrete. Ruiz (1966) found that the compressive strength of concrete increases with an increase in coarse aggregate content until a critical volume is reached, while Bayasi and Zhou (1993) found little correlation between compressive strength and coarse aggregate content.
Different studies were conducted to investigate influence of aggregate content in concrete on compressive strength for a particular type of cement paste and it was found that a gradual decrease in compressive strength is associated with increasing volume of aggregate from 0~20 (volume is measured as a percentage of total volume).
May 11, 2019· This work was obligated to present in one. The fundamental and practical information in the filed of the comparative analysis of the strength of concrete made from various aggregate which may be useful to people involve in civil and structural engineering and particularly, those that found pleasure in the design and related structure.
Compressive strength of concrete cube test provides an idea about all the characteristics of concrete.By this single test one judge that whether Concreting has been done properly or not. Concrete compressive strength for general construction varies from 15 MPa (2200 psi) to 30 MPa (4400 psi) and higher in commercial and industrial structures.
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
on compressive strength of concrete. Compressive Strength of Concrete, f'c Concrete Technology 14 2.4a) Influence of Mineralogy Differences in the mineralogical composition of aggregates affect concrete strength. fc 1000 psi The reason for limestone to produce higher strength is because CaCO3.Ca(OH)2.xH2O is formed at interface in TZ.