Concrete compressive strength is an important indicator to deterioration resistance since the increase of cement content and the reduction of w/c ratio improves the compressive …
— The compressive strength of a concrete mix is a major index of its quality. 1, 2 Neville and Brooks 3 proved that the strength of concrete increases with time due to improved degree of hydration. Thus, a …
— In this paper, the effect on compressive strength of hardened concrete using treated wastewater (TWW) and dry sludge (DS) produced by water purification facilities in concrete mixes to substitute ...
— For the purpose of structural design, concrete is classified into several strength classes based on the so-called characteristic compressive strength f ck in most of European standards (e.g. EN 1992 [3] and NF EN 206-1 [4]) or on the specified compressive strength f c ' in the American standard (ACI-318 [5]).Hereafter, both f ck …
— This indicates a consistent beneficial effect of end-hook steel fibers on the compressive strength of the concrete cubes. As shown in Fig 8, when the 60mm end-hook steel fiber reinforced concrete content …
The concrete compressive strength covers a wide range of different tests, and the data are scattered in some studies. Therefore, in the current study, f c ′ is restricted to 25, 35, and 45 MPa. Fig. 6 demonstrates the effect of concrete compressive strength on the EBROG bond capacity. This figure is organized based on the number and size of ...
The factors that were studied to evaluate the effect of cylinder size on concrete compressive strength were aggregate size, technician, compressive strength, and age of specimen at testing. It was determined that compressive strength was the only factor significant in affecting the ratio of 4 x 8
— In case of concrete, for designing structures compressive strength is a salient feature. Concrete mix is designated as per its compressive strength after 28 days of curing for example M25 is a design mix with characteristic compressive strength of 25 N/mm 2 and targeted strength of 31.5 N/mm 2. This strength is completely dominated by the ...
— The elasticity modulus is a very considerable feature of material because of the stresses in the material under load and the effect of the displacement on the structure (Jurowski and Grzeszczyk 2015).One of the most important parameters that will directly affect the reliability of structural analysis and determination of risky structure in existing …
— The amount of load applied is then calculated, resulting in the compressive strength of the porous concrete. A depiction of the compressive strength test carried out by the UTM can be seen in Fig. 10. During a compressive strength test, a pervious concrete sample is positioned vertically between two metallic plates and subsequently subjected …
— 1. Introduction. ed concrete, belonging to the wider class of lightweight concrete, is a special type of concrete that typically includes cement, water, preformed and fine sands, in conjunction with other sand-like fine particles such as fly ash or silica fume [1].The components mixed with the cement paste give rise to the …
— At the same time, the influence of the initial static load on dynamic compressive strength of concrete could be reduced when the strain rate was increased. Ref. [26] investigated the dynamic compressive behavior of high-strength concrete with three different strengths: 60 MPa, 80 MPa and 110 MPa, with labels; C60, C80, C100, …
— Abstract. Aggregates strongly affect the concrete's freshly mixed and hardened properties, mixture proportions, and economy. The utilization of fine aggregates of four...
Effect of carbon nanotubes on properties of cement mortars. Rafat Siddique, Ankur Mehta, in Construction and Building Materials, 2014. 5.2 Compressive strength. The compressive strength is the capacity of a material or structure to withstand loads and the ultimate compressive strength of a material is that value of uniaxial compressive stress reached …
— Results showed that there is a relatively minor relationship between the rate of loading and the strength in terms of compression for both specimen sizes in which the trend indicates that as the...
— This paper explores the usage of FA in concrete and its effect on fresh and hardened concrete. The mechanical and durability properties of the concrete with FA are discussed in the paper. ... 2013) reported that the higher free lime content in FA resulted in earlier setting and higher compressive strength (CS), especially at younger ages. With ...
— The summary of fit parameters of sub-models, such as the cement hydration model, moisture diffusion model, and strength development model, are listed in Table 2.The verification of these sub-models is available in our former studies [27], [28].Wang and Lee [27] evaluated the reaction degree of cement paste and strength development of …
Compressive strength is an essential property in structural materials, for example, mortar, which comprises the interacial transtition zone in concrete, stone, and steel, since material design is normally evaluated in terms of the risk of compression failure. In addition the CBM is known as having strength for compression force. Therefore plenty of standard tests …
— The experimental values for compression, split tension and flexural strength are presented below under separate headings. 4.1 Effect of Fly Ash on Compressive Strength. Figure 3 shows the deviation of percentage of residual compressive strength of standard concrete (SC) with percentage of fly ash. From Fig. 3, the values of percentage …
— With low tensile strength and strain capability, plain concrete is a fragile substance [1].Additionally, according to research, cement mortar may have issues with its tensile capacity, high porosity, fracture development, weak impact resistance, water penetrability, and chemical stability [2].Since the late 1960s, the usage of fiber …
— From an extensive experimental dataset, an analysis of published strength data, and an interpretation of compressive failure as a critical phase transition from an …
— Compressive strength of concrete containing RHA, adapted from [34,37,53,57]. ... to the packing effect of the pores in the concrete, and enhanced the hydration reaction and .
— The compressive strength of concrete refers to how many pounds per square inch (psi) it can handle when force is applied. It is a reliable indicator of how it will perform under heavy loads or internal pressures caused by freeze-thaw cycles. Understanding what the different psi ratings mean is essential for specifying the right …
— The compressive strength of the concrete produced using basaltic crushed stone aggregate was higher than the one produced using ... course on effect of heat on concrete, Udine, Italy. Google Scholar Scherefler BA, Brunello P, Gawin D, Majorana CE, ve Pesavento F (2002) Concrete at high temperature with application to tunnel fire. ...
— Compressive strength is a critical factor in the design and construction stages. Increasing the compressive strength can improve concrete manufacture by decreasing the production period, energy consumption and labour force, thereby ensuring eco-friendliness [48], [49].The development of early-strength concrete is affected by …
— The aggregate size plays an important role in the nonlinear mechanical behaviour of concrete, which is strongly related to the size effect. In this study, the meso-mechanical modelling method has been established based on the continuous grading aggregate model to simulate the uniaxial compressive failure behaviour under quasi …
— In this paper, a detailed investigation of the influence of material brittleness and internal stress redistributions on the structural response of reinforced concrete members is presented. This work is …
— Properties such as compressive strength were determined, besides determining the workability of the fresh concrete. However, compressive strength is improved by dosage 1.0% of SP after 28 days ...
— For each mixture evaluated, twelve three-point prisms were tested at 27.5, 41.3 and 55.1 MPa concrete compressive strengths (4000, 6000 and 8000 psi) to determine the effect of concrete compressive strength on crack growth potential. In addition, splitting tensile tests were conducted on three samples at each compressive strength for all …
— The compressive strength of concrete is highly influenced by the properties of test specimens, such as size and moisture content. This paper presents the results of compression tests on more than 650 test …
— It has been observed that, higher concentration of sodium hydroxide solution gives better results in terms of compressive strength of geopolymer concrete. 3.8. Curing temperature The effect of curing temperature on compressive strength of concrete has been observed by comparing results of concrete Mixes 9. Details of the mixes are given in …
— The effect of strain rate on the compressive behaviour of high-strength concrete (HSC) after exposure to elevated temperatures was experimentally investigated. 45 HSC prisms were heated up to 20, 200, 400, 600 and 800 °C.The pre-heated prisms were then axially loaded at a quasi-static strain rate of 10 −5 s −1 as well as two …
— The compressive strength of biochar-modified concrete at 1 d age decreased slowly with the increase of biochar addition, while the compressive strength values were higher than that of PC. The free water in concrete was reduced due to the strong water absorption and water retention of biochar, so that the initial setting time was shortened, …
— The compressive strength values of the concrete prepared with the different types of aggregates are shown in Table 5. The concrete prepared with the recycled concrete aggregates had a lower compressive strength than the concrete prepared with the crushed granite at the ages of 7 and 28 days.
It is important to consider an effect of a member size when estimating the ultimate strength of a concrete member loaded for all types of loading conditions. As well known as size effect, the strength of a member tends to decrease when the member sizes increase. Therefore, due to the recent increased interest in the topic of size effect of concrete this …
— With the integration of steel fibers, the increase in compressive strength in concrete samples is quite evident, which has many effects on increasing the overall mechanical performance of concrete. The addition of macro syntactic fibers improves the fracture toughness and flexibility of concrete (with a slight increase in compressive …
Normal reduction in strength of concrete by use of air-entrained admixtures varies from 3 to 7%. This variation of strength shall be considered in the mix design of concrete so that a desired compressive strength is achieved with required amount of admixture and workability. Suitably, trial mix designs should be done to find exact variation of strength …
— The strength of concrete affects the influence of size and shape effects on the compressive strength of a specimen. Also, the size effect is dependent on the maximum aggregate size for both medium and high strength concrete.
