Cement is a key ingredient of concrete, typically making up 10 to 15 percent of the concrete mix by volume. Portland cement and portland-limestone cement are the most common types of cement used in concrete. In concrete, a paste made of cement and water is mixed with aggregates (sand, gravel, or crushed stone).
1. Introduction. Rock-filled concrete (RFC)is widely used due to its advantages of effectively reducing cement consumption, improving construction efficiency, reducing construction cost, green and low-carbon [1], [2], etc.It [1] uses self-compacting concrete (SCC) 's characteristics of high fluidity and high penetration to fill large volume …
This study investigates the influence of the replacement of 20% of Portland cement for silica fume (SF) or a 20-µm medium diameter quartz powder (QP) on the …
ASR (Kalakada et al., 2019; Najaf et al. 2022).The goal of this survey is to investigate the effects of substituting cement with glass powder in silica fume concrete for its workability, dry ...
From the results of the compressive strength obtained that the concrete with the value of FM 5.00 and FM 5.50 decreased, but the concrete with the value of FM 6.00 experienced an increase, while ...
Dolomite powder acquired by pulverizing rock forming mineral deposit of dolostone can be utilized as a trade material for cement in concrete up to certain …
The mechanical properties, microstructure and permeability of high-volume iron tailing powder (HVITP) concrete and high-volume fly ash (HVFA) concrete were comparatively investigated by measuring ...
The rock dust, which is a by-product obtained from the production process of crushed-stone aggregates, is another well-known powder material to be used in concrete. During rock extraction and mechanical processing, and due to their sorting, large quantities of waste material are produced in the form of rock dust.
The effects of ordinary limestone powder (OLP) and ultrafine limestone powder (UFLP) on the fluidity, setting time, compressive strength, hydration heat and microstructure of calcium sulfoaluminate cement (CSA) were investigated. The results show that finer limestone powder reduces the fluidity and setting time of CSA. Increasing …
In its standard practice 211.1-91 Selecting Proportions for Normal, Heavyweight, and Mass Concrete, The American Concrete Institute (ACI) includes Table A1.5.3.6 giving the volumes of coarse aggregates for …
Recycled powder (RP) is the main by-product in the reclamation of construction and demolition (C&D) waste. A body of literature on the use of RP as supplementary cementitious materials (SCMs) in concrete is currently available, whereas a detailed review on the properties of RP concrete has been lacking until now. …
Fig. 1 shows the temperature profiles of MKPC pastes during the first 1500 min. It can be seen that two temperature peaks appeared for M1 [16].The temperature increased to about 38 °C immediately after mixing with water, then decreased with time.A second temperature peak appeared at about 700 min.Because of the effect of CR, the …
The use of RP improves the durability of concrete when the RP fineness is superior to the cement fineness. Increasing the RP fineness is an effective approach to improving the properties of RP concrete, and a CO 2-curing treatment of RCP is an eco-friendly modification method. Furthermore, the use of RP in concrete has good …
The fineness of cement refers to the particle size distribution of the powder and has a direct impact on the speed of hydration, the rate of strength development, and the ultimate strength of the hardened concrete. In order to produce high-quality concrete, it is essential to use cement with the proper fineness.
Iron tailings are collected from the mine, dried, dehydrated and ground into fine iron tailings powder (ITP). See Table 3 for specific performance indexes. The main chemical composition of iron tailings powder by XRF is SiO 2, including some metal elements such as iron, copper and zinc.See Table 4 for the main chemical composition.. …
powder fineness and content; the temperature grows after electrification, and the concrete exhibits a high heating effect. Graphite powder exerts little influence on the hydration products of the concrete. With an increase in the content and fineness of graphite powder, its filling efficiency becomes rather helpful to form the conductive path.
1. Introduction. As an essential component of concrete, different types of chemical admixtures have been widely applied to improve properties. Chemical admixtures enable the manufacture and construction of high performance ready-mix and also precast concretes [1, 2].This paper reviews recent developments and research on …
One of the precursors was rock phosphate powder from a local supplier, which replaced 30% of the fly ash. ... M-sand with a fineness modulus of 2.45 and a specific gravity of 2.6 were employed for the control specimen. ... The ingredients were dry mixed in a concrete mixer for 10 min before adding alkaline solution to the mixer at the …
This research compares the behavior of high flow concrete made from Type III cement with varying fineness of supplementary limestone powder. In the precast industry, where limestone powder is added to concrete mixes with Type III cements, benefits have been recognized, including increased cohesion and improved surface finish. Being able to
This study discussed the revolution of design mix proportion towards achieving high strength with considerably cement content using local availably constituent materials and developed the rational mix design approach. Problem statement: Production of concrete is always deal with inconsistency. Sources of variation like materials from …
The effect of phosphate rock powder was eliminated by adding phosphate rock powder of equal mass to the phosphate rock powder film of the PU treatment to the other treatment. The wheat sowing rate was 150 kg ha –1, and the row spacing was 0.25 m. The phosphorus fertilizers and potassium fertilizers were applied …
The use of SF in the concrete increases the water requirement because of its ultra-fineness; consequently, its essential to add super-plasticizer to attain the required workability. ... (15%, 20%, and 25%) in the production of reactive powder concrete (RPC) with a low water/binder ratio, and noted a reduced compressive strength with 15% silica ...
Lightweight concrete (LWC) can increase mix volume by adding supplementary qualities like reducing the dead load making it less heavy than normal concrete having density up to 1840 kg/m3.
Semantic Scholar extracted view of "Mechanical properties and water absorption of cement composites with various fineness and contents of waste brick powder from C&D waste" by Zhiming Ma et al. ... D waste}, author={Zhiming Ma and Qin Tang and Huixia Wu and Jianguang Xu and Chao-feng Liang}, journal={Cement & Concrete Composites}, …
This review paper has given the analysis of utilization of crushed rock fines as the partial replacement of natural river sand with compared with control concrete by …
It can be applied to fields as a powder, liquid, or slurry. Depending on the application, rock phosphate can be mixed with other ingredients, such as water and lime, to form a slurry or liquid fertilizer solution. ... If using soft rock phosphate, add it to the potting soil or planting hole before planting. Use 2 to 10 pounds of organic ...
In this paper, C40 concrete was prepared with different content and fineness of phosphorus tailings, and the effects of phosphorus tailings on its …
other cement mortar or concrete properties [7,9,12,15,16]. The basalt rock powder is considered to be a relevant filler to cement thanks to exceptional structural properties that basalt rock presents.
Fine rock powder and rice husk ash are residues generally discarded in the environment, causing environmental problems. This study investigated the durability of concretes containing rice husk ash and two rock powders, partially replacing cement …
