1. Introduction. Ultra-high performance concrete (UHPC) is a new generation of high-performance concrete with extremely high strength, ductility, and durability [1, 2].This type of concrete is generally considered to be characterized by a compressive strength above 150 MPa, fracture energy in the range of 1200–40000 J/m 2, a Young …
Abstract. The present study aims to develop 4 types of sustainable modified sand using various proportions of desert sand, natural crushed sand, and recycled …
1. Introduction. Water absorption is one of the most important transport properties of concrete. Most aggressive ions penetrate into concrete through water absorption, leading to durability-related damage and performance degradation [[1], [2], [3]].Although diffusion also plays a role in ionic transport, it has been demonstrated that …
Loss in compressive strength, weight change, sorptivity, and micro-structural changes (XRD, SEM, and EDS) all were evaluated for up to 360 days. It was found that …
Abstract. This paper addresses experiments and theories on Self-Compacting Concrete. First, the features of "Japanese and Chinese Methods" are discussed, in which the packing of sand and gravel plays a major role. Here, the grading and packing of all solids in the concrete mix serves as a basis for the development of …
Apr 19, 2021. Prediction of Compressive Strength of Concrete with Manufactured Sand by Ensemble Classification and Regression Tree Method. Authors: Qiang Ren, Luchuan …
Furthermore, Fig. 3 reveals that all sand/gravel mixes attain a minimum void fraction with sand/gravel (mass) ratios of 40/60 to 60/40 (both in loose and compacted condition). The coarser the sand, the higher the most favourable sand content (as a smaller volume of the concrete will then comprise paste). Fine sand (0–1 mm) attains a …
Compacting Concrete (say 30% - 40%). Usage of Foundry Sand at a percentage of about 10% has controlled the strength characteristics. Glass Powder when preferred above 40% reduces the hardened ...
2.1 Materials. Concrete mixtures of this study consisted of general use (GU) cement, sand and CR as fine aggregates, gravel as coarse aggregates, and water. The maximum nominal size of sand was 4.75 mm and gravel 20 mm. CR was produced by shredding waste rubber tire in a commercial manner.
In this investigation, coral sand is presented as a sustainable substitute for conventional river and machine-manufactured sand. This study comprehensively …
Zitouni et al. investigated the effects of the type and distribution of particle sizes in rolled and crushed coarse aggregates on the physico-mechanical properties of concrete. The purpose of this study is to determine the effects on concrete mixture properties like compressive strength and workability of using 3/8 mm fraction rolled …
The study resulted in the 28-day strength of the CLC brick with a mass ratio of cement to sand 1:2 of 0.52 MPa, and the strength of the CLC brick with a mass ratio of cement to sand 2:3 was 0.68 MPa.
For the casting of foam concrete, OPC Cement of Grade 43 and sand is taken in a 1:1 ratio. The specific gravity of the cement used in the test is 3.053. The initial and final setting time was 83 min and 190 min respectively. Consistency of cement is …
EXPERIMENTAL INVESTIGATION. A. Mix proportioning Two grades of concrete M20 and M25 having nominal mix proportion of 1:1.5:3 and 1:1:2 respectively were used by weight and w/c ratio was fixed according to the slump requirement of 60mm. For this concrete mix, quarry dust was added for replacement of sand from 0% to in step of 10%.
In this study, durability properties of self-compacting concrete (SCC) made with various percentages (0%–30%) of WFS as a partial replacement of river sand up to …
The mobilized friction angle of sand-concrete interface with groove of 8 mm is about 75–89% higher than that of sand-concrete interface with surface. 3. The friction angle of sand-concrete ...
Comparative Analysis of Sands for Concrete Making: Case Study of River Sand, White Sand and Crushed Sand in Kinshasa, DR Congo December 2023 DOI: 10.21203/rs.3.rs-3774268/v1
Development of cementitious capillary crystalline waterproofing agents and durability study of concrete in the presence of chloride with sulfate in aqueous environment. Author links open overlay panel Zilong Wu a b, Jun Zhang c, Wei Xu d, ... The mixture of medium sand and fine sand with the ratio of 1:1 was used, where the …
Buildings 2022, 12, 1273 2 of 27 in the M25 grade concrete up to 25% replacements. Fifteen percent silica sand replace-ment gave the better compressive, flexural and split tensile strengths ...
concrete and recycling old, demolished concrete as aggregate for new concrete. This study presents the information about the opportunities. for sustainable and economical concrete. Applications of ...
of sand for improved strength of concrete [6]. Another study collected sand from ten different locations of Chittagong to produce concrete cubes for testing compressive strength [7]. Among these ...
concrete, in construction, structural material consisting of a hard, chemically inert particulate substance, known as aggregate (usually sand and gravel), that is bonded together by cement and water. Among the ancient Assyrians and Babylonians, the bonding substance most often used was clay. The Egyptians developed a substance more …
The friction angle of sand-concrete interface decreases with increasing interface area ratio from 0.28 to 0.75. The peak shear stress was formed in sand-concrete samples with Ar = 0.28, and it is almost similar to that of natural sand samples. The mobilized friction angle decreases with the increasing Ar.
This test assessment was performed to survey the quality and quality properties of M20 assessments of concrete mixes, in which customary sand was most of the way displaced with waste foundry sand (WFS). Typical sand was replaced with five rates (0%, 5%, 10%, 15% and 20%) of WFS by weight. An aggregate of ten strong mix …
The results of the study revealed that the optimum increase of compressive strength of 9.8% against the control concrete mix was achieved when a concrete mix of 10% RHA partial cement replacement ...
Varying the mix of cement, sand and aggregate used in a concrete blend enables its use in a range of applications. Construction of a typical family home will require 14 tonnes of cement, a kilometre of motorway will contain as much as 2,500 tonnes of cement, and a building can be made to last for 100 years. Products can be designed, …
Abstract: Concrete mechanical properties could be improved through adding different materials at the mixing stage. Quarry dust (QD) is the waste produced …
replacement of sand with m sand. Key words:: Experimental Study, Partial Replacement, Cement, Fly Ash, Sand, M sand. 1.INTRODUCTION Concrete is the most widely used construction material in civil engineering industry because of its high structural strength, stability, and malleability.
As Chinese development of marine resources intensifies in recent years, more and more offshore platforms and buildings, island structures are under construction. However, concrete aggregate and freshwater resources which are used to mix concrete are usually limited in coastal areas or on the islands. This paper concentrates on marine sand and …
When making your own concrete it's important to use the correct concrete mixing ratios to produce a strong, durable concrete mixture. Some basic mixing ratios for concrete are 1:2:3, 1:3:3, 1:2:4. These mixing ratios are based on the proportions of cement : sand : stone in that order. The ratio you use will depend on what psi strength …
2021. TLDR. Toxicity characteristic leaching procedure (TCLP) results showed that the concentration of heavy metals in the leachate WFS, mortars containing treated and untreated W FS, and ground granulated blast-furnace (GGBF) slag was within the standard permitted limitations and WFS is not a hazardous waste. Expand. 9.
The UFS was collected from moulding process of ferrous metal casting industry near Ganapati, Coimbatore, India. The UFS had the specific gravity 2.32 and fineness modulus 1.74, which was very fine as stated by Singh, et al. [15].The study was made to determine the elemental composition of UFS by EDAX test as shown in Fig. …