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aggregate cement

Aggregates - Cement

Gap-graded aggregate are used to obtain uniform textures in exposed aggregate concrete. Close control of mix proportions is necessary to avoid segregation. Shape and Size

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Mechanical performance of recycled aggregate concrete in

2023年12月1日  1. Introduction China's total output of commercial concrete was 3.06 billion cubic meters, an increase of 5.53% compared with the previous year in 2021 [1].

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Aggregates for Concrete

2017年8月5日  Hydraulic cement concrete is a cement and water paste in which aggregate particles are embedded. Aggregate is granular material such as sand, gravel, crushed

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Aggregate-cement chemical interactions - ScienceDirect

1998年7月1日  The aggregate-cement paste interfacial transition zone (ITZ) is known to be the weakest region in concrete, influencing both mechanical properties and durability

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Civil engineering materials_东南大学_中国大学MOOC(慕课)

The course discusses the most important groups of materials used in construction, including aggregate, cement, concrete, asphalt materials, and steel. —— 课程团队 课程概述

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Physical, mechanical properties and microstructure of

2023年3月1日  1. Introduction Concrete is a mixture of cementitious material, aggregate, and water. Aggregates are essential granular materials used in civil engineering ( Přikryl,

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Study on the Properties and Mechanisms of a

2021年4月20日  The scanning area is divided into cement matrix, aggregate surface and aggregate cement interface to evaluate the effect of different agitation methods on cement particle distribution and gel

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Aggregate Concrete - an overview ScienceDirect Topics

The total water/cement ratio does not take into account the absorption ability of the recycled aggregate, while the effective water/cement ratio does and allows for only the water

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New Mix Design Method for Recycled Concrete Using Mixed

2020年5月2日  Abstract This study proposes a new mix design method for C30 recycled concrete using recycled aggregate crushed from different strength source concrete (SC). The dosages of cement, water, sand, and coarse recycled concrete aggregate (CRCA) are the same as the corresponding components in natural concrete, but the CRCA should be

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Investigation of properties of lightweight concrete with

2014年5月20日  This paper reports the investigation of the properties of Lightweight Concrete (LWC) made from Portland cement and diatomite aggregate. The chemical and physical properties of diatomite and the mechanical properties of LWC with regard to the effects of calcined temperature and gradation were studied. The uncalcined diatomite

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Mechanical performance of recycled aggregate concrete in

2023年12月1日  The influences of parameters such as water–cement ratio, aggregate content, and aggregate cement ratio on RAC mechanical properties were carefully explained. In addition, the influence of aggregate content on the elastic modulus of recycled concrete and the correlation between elastic modulus and compressive strength are

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Full article: Research on the calculation method of concrete ...

2023年7月20日  2.1. Test details. The test includes three parts: in the first part, the physical properties of coarse aggregate are taken as the research object, the effective water absorption, apparent density and crushing index of coarse aggregate are taken as variables; in the second part, the compressive strength of cement mortar is taken as the research

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Interfacial interaction of aggregate-cement paste in concrete

2015年1月31日  The chemical and physical interactions in the interfacial transition zone (ITZ) between three different types of coarse aggregates (limestone, granite and basalt) and cement paste were investigated. The results show that all the aggregates are chemically active. Significant amounts of Ca2+, K+, and Na+ are absorbed by all the aggregates

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Geomaterials as construction aggregates: a state-of-the-art

2021年11月22日  Therefore, considering recent annual production of cement worldwide (4–4.2 Gt), about half of aggregates (from the total of 40–50 Gt) is spent in the manufacturing of hydraulic cement concrete (similar estimates can be found elsewhere—see e.g., Gagg 2014). Another 2 Gt of aggregates are bound by bitumens in asphaltic

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Accuracy Prediction of Compressive Strength of Concrete

2023年5月17日  The use of alternative materials and recycling in construction has gained popularity in recent years as part of the industry#x2019;s commitment to sustainability. One such material, recycled aggregates, has been extensively studied over the past two decades for its potential to replace natural aggregates in cement-based composites.

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Full article: Strength and microstructure of eco-concrete produced ...

It shows a well-developed aggregate–cement paste interface and the hydration product having a structure with no pores and cracks. However, Figure 12 (b) and 12(c) show the SEM images taken from the fractured surfaces of the concrete samples containing 25% and 100% glass sand aggregate (FWG) as a natural sand replacement, respectively.

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Experimental study of the effect of aggregate type on concrete strength ...

2021年5月1日  This study aims to investigate the influence of calcareous aggregate (CL Agg.) and siliceous aggregate (SL Agg.) on the strength of ordinary concrete through experiments, microscopic characterization, and molecular simulation. Results indicate that the ITZ (Interfacial Transition Zone) microhardness of CL Agg.-Cement is higher than SL

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Vertical distribution of pore-aggregate-cement paste in

2020年3月20日  For each cubic meter, the mixture contained 1539 kg of aggregate, 113 kg of water, 402 kg of cement and 14 kg of admixture, respectively. Correspondingly, the constant water-to-cement ratio and the aggregate-to-cement ratio by mass were 0.27 and 3.70, respectively. Only hard and clean coarse limestone aggregates passing through 9.5

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Physical, mechanical properties and microstructure of

2023年3月1日  The presence of silt and clay in the river sand reduces the setting time of cement and make concrete and mortar weak and holds the dampness (Mundra et al., 2016, Gowhar et al., 2018).Globally, it is noticed that the strength of concrete depend on the kind of aggregate, cement, water and the ratio water on cement. The use of crushed

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Study on Road Performance of Cement-Stabilized

2022年3月24日  The purpose is to enhance the recycling utilization rate of old base material and make the cement-stabilized recycled aggregate (RCA) maintain good toughness and crack resistance; rubber particles and

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Partial replacement of aggregate with ceramic tile in concrete

2023年5月31日  It is said that the cement has a typical consistency when the plunger can easily penetrate the cement. 3.6.3. Setting time of cement. Cement begins to harden and set almost instantly after water is added to it, and it also becomes more rigid. The amount of time it takes for cement to harden can vary based on a number of various factors.

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Aggregate-cement paste interface. ii: influence of aggregate

1998年10月1日  This paper describes part of a large project on aggregate-cement interactions and interface bonding mechanisms in concrete. This part of the study investigates the influence of aggregate physical properties on the nature of aggregate-cement paste interfacial bonding with the aim of establishing the bonding mechanisms as

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Sustainability Free Full-Text Effect of Aggregate Size and

2023年1月7日  Pervious concrete is one of the emerging sustainable materials that has recently gained the attention of many researchers. The importance of pervious concrete mainly depends on its application and on a modern integrated approach in which it is employed to reduce the effects of flooding. The main goal of this experimental analysis is

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Restraining effect of aggregates on autogenous shrinkage in cement ...

2021年6月28日  Fig. 4 shows the autogenous shrinkage of blast furnace slag cement mortars (CEM III 42.5 N) with water-cement ratio 0.3 and different sand-cement weight ratio, i.e. 0.1, 0.3, 0.5 and 0.7, calculated with the original Pickett model and the extended Pickett model. This figure shows that the autogenous shrinkage calculated with the extended

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The effect of aggregate-to-cement ratio and types of

2008年4月1日  The effects of aggregate-to-cement (A/C) ratios and types of aggregates on the properties of pre-cast concrete blocks are evaluated in this study. A/C ratios between three and six and three types of aggregates (i.e., natural crushed aggregate (NCA), recycled crushed aggregate (RCA) and recycled crushed glass (RCG)) were used in the

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The aggregate-mortar interface - ScienceDirect

1985年11月1日  The hardened cement paste cantilevers (150 × 150 × 750 μm 3) attached to a quartzite aggregate surface were prepared and tested under the monotonic and cyclic load using a nanoindenter. The measured flexural strength of the ITZ (10.49–14.15 MPa) is found to be one order of magnitude higher than the macroscopic strength of ITZ reported

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The constituents, properties and application of

2019年8月10日  For fine aggregate, particle shape and surface texture may have the same or great effect as the coarse aggregate on the water requirements and the compressive strength of HWC [24], [29]. 2.4. Admixtures. Admixtures can be defined as all the materials added to the cement, the water and the aggregate in the concrete composition.

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