scholarly journals Frost resistance of cement composites prepared on the basis of waste water from a concrete plant

2018 ◽  
Vol 13 (1) ◽  
pp. 123-132
Author(s):  
Lukas Klus ◽  
Vojtech Vaclavik ◽  
Jakub Svoboda ◽  
Jindrich Sancer
Keyword(s):  
Waste Water ◽  
Portland Cement ◽  
Experimental Research ◽  
Frost Resistance ◽  
Resistance Coefficient ◽  
Resistance Test ◽  
Cement Composites ◽  
Recycled Water ◽  
Recycled Waste ◽  
Mixing Water

Abstract This article presents the results of a research dealing with the use of waste water from concrete industry as a possible substitution of mixing water during the production of cement composites. This experimental research involved the preparation of two recipes of cement composites, named R1 and R3. Mixing water in these recipes was replaced with waste water from a concrete plant in the amount of 25, 50, 75 and 100%. Samples of recycled waste water, which were tested for the content of sulphates, chlorides and alkali according to ČSN EN 1008, were taken in order to determine the properties of waste water from a concrete plant. The prepared test specimens were tested for frost resistance after 100 freezing cycles according to ČSN 73 1322. The results of the frost resistance test showed that the required value of the frost resistance coefficient of 0.75 according to ČSN 73 1322 was achieved only in case of recipe R1 based on Portland cement CEM I 52.5R and 75 and 100% substitution of the mixing water with recycled water from a concrete plant.

scholarly journals Modeling the composition of fine-grained modified concrete elaborated with vibropressing technology

2019 ◽  
Vol 298 ◽  
pp. 00133 ◽  
Author(s):  
E. R. Pyataev ◽  
A. Y. Ushakov
Keyword(s):  
Portland Cement ◽  
Experimental Research ◽  
Frost Resistance ◽  
Building Materials ◽  
Road Construction ◽  
Average Density ◽  
Optimal Composition ◽  
Fine Grained ◽  
Main Components ◽  
Modifying Additive

The article analyzes the property requirements of small-piece products used in road construction, specially those related to water and frost resistance. It describes the main features of the vibration technologies involved in the manufacture of building materials, in particular, paving slabs. The article presents conclusive results, obtained through scientific research, which allow us to establish the influence of both, the costs of the main components and the parameters of vibration compression, on the properties of the final product. Combining the analysis of classical methods with the results of experimental research, a methodology has been developed for reaching an optimal composition of fine-grained vibropressed concrete modified with active additives. It is shown that the particular strength achieved from the combination of vibroformed fine-grained concrete, whose average density is 2270–2320 kg/m3, with polymer multifunctional modifiers, is mainly due to the use of Portland cement, a modifying additive, and the pressure conditions employed during the experiment..

scholarly journals Reuse of Waste Material “Waste Sludge Water” from a Concrete Plant in Cement Composites: A Case Study

2019 ◽  
Vol 9 (21) ◽  
pp. 4519
Author(s):  
Klus ◽  
Václavík ◽  
Dvorský ◽  
Svoboda ◽  
Botula
Keyword(s):  
Cement Mortar ◽  
Fresh Concrete ◽  
Hardened Cement ◽  
Cement Composites ◽  
Complete Replacement ◽  
Economic Problems ◽  
Waste Sludge ◽  
Recycled Waste ◽  
Mixing Water

This paper presents the results of research dealing with the use of recycled waste sludge water from a concrete plant (CP) as partial or complete replacement of mixing water in cement mixtures. The need to recycle waste sludge water generated as a by-product (waste sludge water) during the production of fresh concrete in the concrete plant results from the environmental and economic problems associated with the operation of the concrete plant. Mixing water was replaced with recycled waste sludge water in the amount of 25%, 50%, 75%, and 100%. In order to determine the effect of partial or complete replacement of mixing water with waste sludge water from the concrete plant in the production of cement composites, laboratory tests of waste sludge water were carried out to determine whether the waste sludge water complies with the requirements for mixing water defined in CSN EN 1008. The tests also determined the properties of fresh cement mortar and hardened cement composites. These were tests of the beginning and end of cement mortar setting, and the strength characteristics (flexural strength, compressive strength). The results of these tests show that it is possible to replace the mixing water by waste sludge water from the concrete plant in the amount of up to 25% without significantly affecting the tested properties, in comparison with the formula containing pure mixing water.

Properties of Magnesium Oxychloride and Magnesium Oxysulphate Cement Composites

2021 ◽  
Vol 903 ◽  
pp. 208-213
Author(s):  
Elvija Namsone ◽  
Genadijs Sahmenko ◽  
Aleksandrs Korjakins
Keyword(s):  
Mechanical Properties ◽  
Energy Consumption ◽  
Portland Cement ◽  
Calcination Temperature ◽  
Experimental Research ◽  
Magnesium Sulphate ◽  
Magnesium Chloride ◽  
Building Materials ◽  
Cement Composites ◽  
Magnesium Oxychloride

Increasing energy consumption is forcing the building sector to seek and use building materials and products that would be environmentally friendly. As one such material should be noted magnesium based cements, which production requires much lower calcination temperature than the traditional Portland cement. During the experimental research part of this work, two types of magnesia cement were produced (using magnesium chloride and magnesium sulphate brine solutions) and physical, mechanical properties of obtained cement composites were determined.

scholarly journals The Utilization of Waste Water from a Concrete Plant in the Production of Cement Composites

Buildings ◽  
2017 ◽  
Vol 7 (4) ◽  
pp. 120 ◽  
Author(s):  
Lukáš Klus ◽  
Vojtěch Václavík ◽  
Tomáš Dvorský ◽  
Jakub Svoboda ◽  
Radek Papesch
Keyword(s):  
Waste Water ◽  
Cement Composites

Preparation and Mechanical Properties of Polyethylene-Portland Cement Composites

2009 ◽  
Vol 1242 ◽  
Author(s):  
Rivas-Vázquez L.P. ◽  
Suárez-Orduña R. ◽  
Valera-Zaragoza M. ◽  
Máas-Díaz A. De la L. ◽  
Ramírez-Vargas E.
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Portland Cement ◽  
Plastic Waste ◽  
Cement Composites ◽  
Compression Tests ◽  
Standard Samples ◽  
Cement Ratio ◽  
Reinforcing Fibers ◽  
Waste Polyethylene

ABSTRACTThe effects of waste polyethylene aggregate as admixture agent in Portland cement at different addition polyethylene/cement ratios from 0.0156 to 0.3903 were investigated. The reinforced samples were prepared according the ASTM C 150 Standard (samples of 5 × 5 × 5 cm). The reinforcing fibers were milling at a size of 1/25 in diameter, form waste and used them to evaluate the effects in mechanical properties in cement-based composites. The evaluation of polyethylene as additive was based on results of density and compression tests. The 28-day compressive strength of cement reforced with plastic waste at a replacement polyethylene/cement ratio of 0.0468 was 23.5 MPa compared to the control concrete (7.5 MPa). The density of cement replaced with polyethylene varies from 2.114 (0% polyethylene) to 1.83 g/cm3 by the influence of polyethylene.

Dielectric and ferroelectric properties of 1-3 barium titanate–Portland cement composites

2011 ◽  
Vol 11 (3) ◽  
pp. S48-S51 ◽  
Author(s):  
R. Rianyoi ◽  
R. Potong ◽  
N. Jaitanong ◽  
R. Yimnirun ◽  
A. Ngamjarurojana ◽  
...  
Keyword(s):  
Barium Titanate ◽  
Portland Cement ◽  
Ferroelectric Properties ◽  
Cement Composites

Fabrication and properties of 3-3 type PZT-ordinary Portland cement composites

2021 ◽  
Vol 305 ◽  
pp. 124815
Author(s):  
Wei Liu ◽  
Lehui Zhang ◽  
Yu Cao ◽  
Jianhong Wang ◽  
Peikang Bai ◽  
...  
Keyword(s):  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Cement Composites

Acoustic and Piezoelectric Properties of 0-3 Barium Zirconate Titanate-Portland Cement Composites-Effects of BZT Content and Particle Size

2013 ◽  
Vol 455 (1) ◽  
pp. 69-76 ◽  
Author(s):  
Ruamporn Potong ◽  
Rattiyakorn Rianyoi ◽  
Athipong Ngamjarurojana ◽  
Rattikorn Yimnirun ◽  
Ruyan Guo ◽  
...  
Keyword(s):  
Particle Size ◽  
Portland Cement ◽  
Piezoelectric Properties ◽  
Barium Zirconate ◽  
Cement Composites ◽  
Barium Zirconate Titanate ◽  
Zirconate Titanate

scholarly journals Properties of cement composites based on limestone depending on their granulometric composition

Vestnik MGSU ◽  
2020 ◽  
pp. 999-1006
Author(s):  
Svetlana V. Samchenko ◽  
Olga V. Alexandrova ◽  
Anton Yu. Gurkin
Keyword(s):  
Composite Materials ◽  
Portland Cement ◽  
Granulometric Composition ◽  
Coarse Grained ◽  
Cement Matrix ◽  
Cement Composites ◽  
Construction Costs ◽  
Initial Strength ◽  
Fine Grained ◽  
Additional Formation

Introduction. The use of limestone in cement compositions as an additional cementing agent solves both environmental and economic problems, namely, reduction of construction costs. In this regard, the study of the properties of the granulometric composition and volumetric content of cement composites, containing limestone, becomes increasingly important. The mission of this research is to optimize the properties of composite materials containing Portland cement and limestone by changing the granulometric composition of flour limestone. Materials and methods. Limestone, having three different Blaine milling fineness values of 250, 300 and 450 m2/kg, was used; its content reached 10, 15, 25 and 35 %. Cement and sand mortars were applied for testing purposes. The influence of the granulometric composition of limestone on the workability and compressive strength of composite cement was determined. Results. The effect of limestone on the limit shear stress becomes more pronounced when the amount of limestone increases to 25 and 35 %. This is most noticeable for limestone with a high content of fine fractions of 5–20 µm. The use of finely milled limestone increases the initial strength of the composite material. By adding 10 and 15 % of such limestone we can increase the strength by 16–20 %, and supplementary 25–35 % of limestone increases strength by 5–8 %. Strength enhancement is due to the reactivity of limestone and formation of calcium hydrocarbon aluminate 3CaO∙Al2O3∙СаСО3∙12H2O, which promotes formation of the crystal framework of the cement matrix. Additional formation of crystalline hydrates in the initial coagulation structure deteriorates the mortar workability, but increases its strength. Conclusions. The use of coarse-grained limestone significantly improves mortar workability, while the use of fine-grained limestone increases its content without reducing its strength. The granulometric composition of ground limestone shall be as close as possible to the granulometric composition of cement for the properties of composite materials containing Portland cement and limestone to be optimized.

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