scholarly journals The effect of ashes on the properties of cement mortar and typical concrete fillers

2019 ◽  
Author(s):  
Janina Setina ◽  
Inna Juhnevica ◽  
Janis Baronins
Keyword(s):  
Portland Cement ◽  
Mechanical Strength ◽  
Frost Resistance ◽  
Building Materials ◽  
Cement Mortar ◽  
Hardened Concrete ◽  
Short Term ◽  
Lightweight Structures ◽  
Active Additive

The production of heat and electricity from shale and biomass is leading to a significant increase in the amount of the combustion residues i.e. ashes. The utilization of ashes as the pozzolanic additive in the production of Portland cement mortar and concrete for the construction of lightweight structures is the most popular way. The interaction of ashes with other typical concrete fillers also can affect the final relative short-term and long-term properties of fresh and hardened concrete when designing the concrete mixture. The influence of wood and shale ashes on the properties of cement mortar and typical concrete fillers (sand, limestone, dolomite) – fresh mortar, hydration process, and hardened mortar were researched and assessed for their applicability in the production of concrete. The best results of mechanical strength, frost resistance and water absorption were measured in case of shale ashes containing samples in combination with cement and selected concrete additive – sand. Shale ashes can be recommended for application as the active additive. Since wood ash was exhibiting lower activity, it can also be applied as a filler to produce building materials.

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..

Influence of Two Types of Nanosilica Hydrosols on Short-Term Properties of Sustainable White Portland Cement Mortar

2018 ◽  
Vol 30 (2) ◽  
pp. 04017289 ◽  
Author(s):  
Payam Hosseini ◽  
Masoume Abolhasani ◽  
Fatemeh Mirzaei ◽  
Mohammad Reza Kouhi Anbaran ◽  
Yousef Khaksari ◽  
...  
Keyword(s):  
Portland Cement ◽  
Cement Mortar ◽  
Short Term ◽  
White Portland Cement

scholarly journals THE INFLUENCE OF POLYMER LATEX AND SILICA FUME ADDITIVES ON THE PROPERTIES OF CEMENT MORTAR AND CONCRETE

2003 ◽  
Vol 9 (2) ◽  
pp. 146-152
Author(s):  
Bronius Vektaris ◽  
Edita Smetonaitė ◽  
Vytis Vilkas
Keyword(s):  
Portland Cement ◽  
Silica Fume ◽  
Coarse Aggregate ◽  
Cement Mortar ◽  
Hardened Concrete ◽  
Free Lime ◽  
Gypsum Formation ◽  
Xrd Patterns ◽  
Polymer Latex ◽  
Strength Of Adhesion

The article maintains that while mixing acryliated latex, cement, fillings, and relaxing additives, flexible, resilient and well sticking to concrete mortars are obtained. Their properties—the lengthening of a mortar layer, tensile strength and strength of adhesion to concrete—may be regulated while changing the quantities of cement and plasticisers. 10–30 % silica fume and Stoniškiai carbonate opoca additives grant to usual Portland cement mortar or concrete the resistance to sulfate corrosion. When the quantity of cement in concrete exceeds 400 kg/m3, an increased quantity of hydraulic additive is necessary 20–30%. Opoca additive ensures a better Portland cement resistance to sulfate action than the same quantity of CaCO3 and Norwegian silica fume mixture. This fact is explained by a larger activity of opoca. However silica fume activity may be increased by reducing silica fume to smaller units, for example by mixing it with coarse aggregate. In hardening, concrete silica fume and other hydraulic additives react with Ca(OH)2 deriving from cement, that's why in hardened concrete free lime diminishes and less secondary expansion units are created. There are vivid peaks of CaSO4·2H2O and Ca(OH)2 in XRD patterns of decayed samples. This research shows that gypsum formation is the main reason of concrete decay in Na2SO4 solution.

NTCC 2017: Long-Term Observation of the Resistance of Novel Hybrid Cement Exposed to Sulphate Solution

2018 ◽  
Vol 761 ◽  
pp. 163-168 ◽  
Author(s):  
Michal Bačuvčík ◽  
Pavel Martauz ◽  
Ivan Janotka
Keyword(s):  
Portland Cement ◽  
Building Materials ◽  
Sodium Sulphate ◽  
Sulphate Solution ◽  
Cement Clinker ◽  
Portland Cement Clinker ◽  
Specific Material ◽  
Long Term Observation ◽  
By Products

This work is aimed to investigate four-years impact of 5 % sodium sulphate solution on the mortar made of novel hybrid cement H-CEMENT, being prepared with maximal content of wastes and by-products and only 20 % wt. of Portland cement clinker, compared to that prepared with the reference CEM I 42.5 N (PC). H-CEMENT for its specific material composition does not meet the criteria for inclusion in the cement kinds reported in EN 197-1 but complies with all of the hygienic regulations and standards imposed on similar building materials.

Strength of Portland Cement with Several Composition of Bottom Ash in Different Fineness with Curing Time of 28 Days

2016 ◽  
Vol 857 ◽  
pp. 311-313
Author(s):  
Ng Hooi Jun ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Kamarudin Hussin ◽  
Soo Jin Tan ◽  
Mohd Firdaus Omar ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Compressive Strength ◽  
Portland Cement ◽  
Environmental Effects ◽  
Coal Combustion ◽  
Cement Mortar ◽  
Bottom Ash ◽  
Curing Time ◽  
Cement Replacement

Concrete is produced increasingly worldwide and accounting 10-20% emission of carbon dioxide. The potential long term opposing cost of environmental effects need to recognize. Residue of coal combustion ashes especially bottom ash will use to develop reuse application. This study focused on compressive strength of several composition of bottom ash as cement replacement in mortar. Curing of cement mortar techniques and duration also plays an important role and effects on the strength. The objective of this research is to examine the compressive strength of bottom ash in Portland cement under various compositions and fineness of bottom ash.

Research on Desulphurization and Skimming Slag Tailing Used as Building Materials

2011 ◽  
Vol 233-235 ◽  
pp. 2332-2336
Author(s):  
Li Xia Li ◽  
Xiao Liu ◽  
Yue Xin Han ◽  
Qi Dong Yuan ◽  
Ning Bo Song
Keyword(s):  
Compressive Strength ◽  
Specific Surface ◽  
Frost Resistance ◽  
Building Materials ◽  
Cement Mortar ◽  
Rupture Strength ◽  
Blended Cement ◽  
Optimum Amount ◽  
Cement Strength ◽  
Curing Age

With the purpose that the desulphurization and skimming slag tailings from Ansteel can be used as building materials, the slag tailings were ground to powders with specific surface area 560m2/kg , and then was blended in cement. Strength of slag tailings-blended cement, Physical-mechanical characteristic, frost-resistance and resistance to carbonizing of slag tailings-blended concrete were studied. The experiment results demonstrated that as the amount of tailings increasing, both of the compressive strength and the rupture strength of cement mortar with 3 and 28 curing age decrease gradually, also did the compressive strength of the concrete modules with 28 curing age. The reason why these strengths decreased was also given. The study showed that the optimum amount of slag tailings to be blended was between 10 wt.% to 20wt.%.

scholarly journals Cement Render and Mortar and Their Damages Due to Salt Crystallization in the Holy Trinity Church, Dominicans Monastery in Cracow, Poland

Minerals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 641 ◽  
Author(s):  
Mariola Marszałek ◽  
Krzysztof Dudek ◽  
Adam Gaweł
Keyword(s):  
Portland Cement ◽  
Building Materials ◽  
Cement Mortar ◽  
Cement Clinker ◽  
Anthropogenic Factors ◽  
Salt Crystallization ◽  
13Th Century ◽  
Holy Trinity ◽  
Fine Grained ◽  
Rock Fragments

The investigations focused on the façade of the 17th-century Myszkowskis chapel at the 13th-century Church of the Holy Trinity in Cracow, Poland. Most of the chapel’s façade is made of rusticated limestone blocks, but its lower part is covered with cement render, and the basement consists of irregular pieces of limestone and sandstone, bound and partly replaced with cement mortar. The façade exhibited clearly visible damages: gray soiling of the surface, cracks, scaling, and efflorescence. The study presents characteristics of the cement render and mortar used for stone repair and/or substitution, as well as efflorescence from the lower part of the Myszkowskis chapel façade. The materials were analyzed with optical microscopy, scanning electron microscopy (SEM-EDS), Raman microspectroscopy, X-ray diffractometry (XRPD), and mercury intrusion porosimetry. The analyses demonstrated that the render covering some of the decayed limestone blocks was prepared using Portland cement (residual clinker grains represent alite and belite) as a binding agent, mixed with crushed stone as an aggregate. The cement mortar consisted of rounded quartz grains, rock fragments, and feldspars in very fine-grained masses of calcite and gypsum, also containing relics of cement clinker (alite, belite, ferrite, and aluminate). All these components point out the use of the ordinary Portland cement. Analyses of the efflorescence allowed us to distinguish several secondary salts, among others, thenardite, aphthitalite, and darapskite. The appearance of these phases is related to the composition and physicochemical properties of the building materials, atmospheric alteration agents, air pollution, and some other anthropogenic factors.

Long term mechanical strength behaviour in fly ash/Portland cement mortars prepared using processed ashes

2002 ◽  
Vol 77 (3) ◽  
pp. 336-344 ◽  
Author(s):  
J Payá ◽  
M V Borrachero ◽  
J Monzó ◽  
E Peris-Mora ◽  
M Bonilla
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Mechanical Strength ◽  
Cement Mortars
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