Cement and silica fume were used as binding materials and their ratios (Silica fume: Cement = 1:5) were kept constant in all the samples. This ratio of cement and silica fume was chosen because studies show that 30% silica fume addition resulted in decrease of workability, so 20% is preferred [22], [27]. The water/binder (w/b) weight …
قرأ أكثر
The waste concrete crushed to prepare aggregates always has poor mechanical properties and low utilization of waste powder. In this paper, WCP was used to prepare artificial aggregates by cold ...
قرأ أكثر
For example, with an adequate mix of cement and aggregates such as sand and gravel, a material can be created that enables the absorption of water and, at the same time, …
قرأ أكثر
The water-cement ratio for such concrete is 0.5-0.4 with cement sand ratio 1: 2 and if the coarse aggregate is also added then 1:1:2.and aluminum content should be 0.05%- 0.08% of the concrete mass. 3) For light weight aggregate …
قرأ أكثر
The obtained coral aggregates are divided into coral fine aggregates and coarse aggregates according to the particle size, as shown in Fig. 2, and the particle size range of coral fine aggregate ...
قرأ أكثر
The rubber aggregate was utilized to replace 10%, 25%, and 50% of the coarse aggregate in the samples. A controlling mixture without substitution of coarse aggregates has also been made for comparison. Preparation of concrete beams, cylinders, and cubes. The concrete samples were tested in the lab.
قرأ أكثر
f. Curing of concrete a. Selection and preparation of ingredients: Various ingredients such as cement, sand, aggregate, and water should be carefully selected according to the desired purpose and strength of concrete. b. Mixing of ingredients: Ingredients of PCC are adequately mixed with their relative proportion. Mixing may be of …
قرأ أكثر
The reuse of construction and demolition waste has become vitally important because of the requirements of environmental protection and sustainable development. The vibration mixing process is a new technology and novel method that improves the performance of concrete by optimizing the mixing process without changing …
قرأ أكثر
Normally, aggregate accounts for over 60% volume of concrete. Accordingly, the use of steel slag as a partial replacement of natural coarse or fine aggregates in concrete would be a promising way that could utilize steel slag at a large scale. The steel slags were used in base and sub-base of road pavement and even in the structural …
قرأ أكثر
In this paper, tunnel granite muck was processed into low carbon, coarse and fine aggregates, and low carbon aggregates were used to prepare bridge concrete. Meanwhile, the mechanical properties, anti-permeability, and frost resistance of concrete were investigated. The results demonstrated that the concrete prepared using low …
قرأ أكثر
Recycling of concrete aggregates obtained from C&D waste towards concrete production is a vital strategy to tackle the environmental impact of both C&D waste and concrete production ... For the preparation of the mixes, sand, coarse aggregate and cement (dry ingredients) were blended for 3 min. Effective water amount …
قرأ أكثر
Preparation of concrete2.2.1. Cement and sand. The cement used in this study complied with the provisions of GB 175-2020 "General Portland Cement" [37]. It was composed of clinker, gypsum, and volcanic ash admixture, belonging to P.O 42.5 ordinary Portland cement. ... As shown in Fig. 18, the compressive strength of RCP artificial …
قرأ أكثر
A review on the use of plastic waste in preparation of cement mortar and concrete preparation is already available [22]. ... Considering the intricate relationship between mixture proportion and properties of plastic aggregate concrete, a random forest (RF) model, a machine learning algorithm, is employed to predict compressive strength …
قرأ أكثر
CHAPTER 1—INTRODUCTION. Hydraulic cement concrete is a cement and water paste in which aggregate particles are embedded. Aggregate is granular material such as sand, gravel, crushed stone, blast-furnace slag, and lightweight aggregates that usually …
قرأ أكثر
The use of ceramics as aggregates in concrete has indeed been extensively studied. The properties of ceramics, including compressive strength, water absorption, and surface roughness[26], [27], play a crucial role in influencing the overall performance of concrete when ceramics are used as aggregates[11], [28]. ... As a result, the …
قرأ أكثر
Gomes and Brito (2009) found that concrete with 50% WCB as coarse aggregates slightly increased the carbonation and chloride ion penetration compared with normal aggregate concrete. Pacheco-Torgal and Jalali (2010) reported that the chloride ion penetration of concrete was decreased when WCB fully replace natural coarse or …
قرأ أكثر
The concrete specimens were heated to 200, 400, 550, and 800 °C at a 7 °C/min rate for 60 min. Lower coarse aggregate strength is a contributing factor to concrete compressive strength reductions.
قرأ أكثر
In several studies, fine natural aggregate of cement mortar and concrete was replaced by coarse sized aggregate too [2,13]. Table 1 highlights the types and amounts of substitution of natural aggregate by plastic …
قرأ أكثر
For the island-reef engineering construction background in the South China Sea, the research studied the preparation technology, mechanical properties and chloride ion diffusion behavior of coral aggregate seawater concrete and discussed the steel bars corrosion behavior of coral aggregate seawater concrete (CASC) and reliability analysis …
قرأ أكثر
Five mixtures of LWAC were prepared with various water-binder ratio (0.2, 0.3, 0.4) and volume ratio of fine aggregate (0.35, 0.4, 0.45). The mix proportions are shown in Table 3.Due to the fact that the high water absorption of WCB could affect the workability of fresh concrete, the aggregates were treated by pre-wetting method.
قرأ أكثر
In addition, unlike the sintered lightweight aggregate concrete, ... and Bayer red mud was developed and utilized for both binders and the preparation of artificial aggregates. An all-solid waste concrete strategy was achieved by gradually replacing cement and natural rock aggregates in cement concrete. Several conclusions were …
قرأ أكثر
Plastic waste aggregate has significantly lower thermal conductivity than the natural aggregate used in concrete preparation. Thus the concrete containing plastic …
قرأ أكثر
After the preparation, FCS-HSCA with a continuous gradation was used as aggregate to prepare concrete. Fig. 9 displays the mechanical properties of concrete prepared with different aggregates. The replacement of FCS-HSCA for FCS results in an increase in compressive strength from 59.9 MPa to 66.1 MPa, while there is an increase …
قرأ أكثر
Additionally, utilizing urban solid waste for concrete aggregate preparation can reduce carbon emissions. Ban et al. ... The compressive strength of the prepared multi-shell lightweight aggregate concrete ranged from 39.8 to 54.5 MPa, splitting tensile strength from 2.44 to 2.95 MPa, and the carbon emission and cost were 36.2% and …
قرأ أكثر
For ordinary aggregate concrete, the failure of concrete is initiated from separation of the interface between the mortar and aggregate surface (mainly due to tension and shear), …
قرأ أكثر
Geopolymer-lightweight aggregate refractory concrete (GLARC) was prepared with geopolymer and lightweight aggregate. The mechanical property and heat-resistance (950 °C) of GLARC were investigated. The effects of size of aggregate and mass ratio of geopolymer to aggregate on mechanical and thermal properties were also …
قرأ أكثر
Mo et al. [23] investigated the carbonated artificial aggregates fabricated by steel slag-fly ash mixture via granulation process and CO2-sequestration and the strength variation of concrete using ...
قرأ أكثر
Abstract. In this study, preplaced aggregate concrete (PAC), a type of coarse aggregate interlocking concrete, was prepared. The preparation process comprises the following two main steps: first, the coarse aggregate was piled in a certain way to form a natural skeleton; then, the skeleton was filled with the formulated mortar.
قرأ أكثر
Recycled aggregate concrete (RAC), prepared by its partial or full replacement, has been studied to show that the properties are influenced by the properties of the RA themselves [[17], [18]]. As the RA particle size increases, the total number of cracks in the RCAC rises more prominently compared to the cracks in the NAC [19]. The …
قرأ أكثر
Using concrete slurry waste and waste brick masonry powder to produce artificial aggregates using the disc granulation method.. Long CSW sedimentation time had a negative effect on the pelletizing efficiency and properties of the artificial aggregates.. The artificial aggregate particles sequestered approximately 3% of CO 2 under CO 2 curing, …
قرأ أكثر
At present, the researches about the application of aerogel in cement-based materials mainly focused on the surface modification of hydrophobic aerogel, improvement of preparation technology, combining with other thermal insulation aggregates, and adopting UHPC (ultra-high performance concrete) or HPC (high performance concrete) …
قرأ أكثر
Chapter 4-Construction procedure. 4.1 -General considerations. 4.2-Preparation of concrete. 4.3-Grout inserts, sounding. 4.4-Forms (high-density) concrete4.5-Coarse. …
قرأ أكثر
Li et al. [30] prepared HDCC incorporating recycled fine concrete aggregate (RFCA) with compressive strength of 40 MPa and strain capacity of more than 0.8%. ... Pre-absorption of water in the preparation of brick aggregates increases the actual water content of the system, which to some extent hinders the geopolymerization and loosens …
قرأ أكثر
The prepared aggregates possessed a resistivity in the range of 3.40–7.34 Ω·m due to the efficient conductive network in the aggregate established by carbon fibers and carbon black. However, the influence of the prepared conductive aggregates on the conductivity of cement-based materials was not investigated the above mentioned studies.
قرأ أكثر
Conventionally, concrete is prepared by evenly mixing the cementing material (a mixture of cement and minerals), coarse and fine aggregates, and water in a …
قرأ أكثر
Preparation of Recycled and Multi-Recycled Coarse Aggregates Concrete with the Vibration Mixing Process. by. Fa Yang. 1, Yunshi Yao. 1,2,*, Xinxin Wang. 1, Jin Wei. 1 and. Zhongxu Feng. 1,2.
قرأ أكثر
Exposed aggregate concrete is a kind of functional concrete material with excellent sound absorption and noise reduction function [19], [20]. Based on different interface properties and aggregates strength, its surface strength could achieve about 19–70 MPa. Meanwhile, the abrasion resistance of exposed aggregate concrete is …
قرأ أكثر