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به خواندن ادامه دهید· Assessing the sulfate resistance of concrete is essential for the use of concrete in sulfate rich environments. A multitude of test methods exists worldwide, showing the relevance of the problem and the difficulty to find a suitable test setup. Testing the relative tensile strength of ASTM C307 concrete briquette specimens after exposure to a sulfate solution is a new direct …
به خواندن ادامه دهید· Influences of polymer-based grinding aid (PGA) on the damage process of concrete exposed to sulfate attack under dry-wet cycles were investigated. The mass loss, dynamic modulus of elasticity (E rd), and S and Ca element contents of concrete specimens were measured. Scanning electron microscopy (SEM), mercury intrusion porosimetry(MIP), and X …
به خواندن ادامه دهیدThe influence of minerals on the sulfate resistance of mortar was analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) tests. The results showed that when compared to single doped quartz powder samples, samples prepared using fly ash or blast furnace slag improved the sulfate ...
به خواندن ادامه دهید· In this study, the blended cements produced by using the building stone waste were exposed to sulphate solution and the cement properties were examined. Prepared mortar specimens were cured under water for 28 days and then they were exposed to three different proportions of sodium sulphate solution for 125 days. Performances of cements were …
به خواندن ادامه دهید· The results demonstrate that sulfate resistance of concretes containing a high volume of mineral admixtures is equivalent to concrete made with SRPC cement when they were buried in sulfate soil. Concrete specimens presented a good visual appearance, without cracking at the edges, and they retained the strength and the elastic modulus. ...
به خواندن ادامه دهید· @misc{etde_20789832, title = {Sulfate resistance of concrete containing high volume of mineral admixtures[ACI SP-234-37]} author = {Irassar, E F, Batic, O R, Di Maio, A, and Ponce, J M} abstractNote = {Various physical and chemical processes that influence the durability of concrete structures were discussed. For underground or on grade structures, the durability of …
به خواندن ادامه دهیدThis study focusses on sulfate resistance of calcined clay (CC) – limestone (L) – Portland cements for mortars exposed to a 0.11 M Na2SO4 solution at 5 and 20 °C after a …
به خواندن ادامه دهید· a b s t r a c t Sulfate resistance of Portland cement-slag mixtures was compared at 30, 50 and 70% cement replacement levels for slags with variable Al 2 O 3 and MgO content and variable fineness ...
به خواندن ادامه دهیدKoster NB1 is a watertight (> 130 m water head) mineral waterproofing with subsequently crystallising agents. Suitable for positive side and negative side waterproofing. A waterproofing made of Koster NB 1 Grey possesses …
به خواندن ادامه دهید· Even though not practical mixtures such as C 100 G 0 were evaluated in this work, this was purely from a mathematical point of view in order to obtain a better sampling of the independent variables (i.e. the mixture composition) using a simplex-centroid design.. Resistance to Grinding. A total of 700 ml of each blend were introduced in a 0.30 m cast iron drum (BICO …
به خواندن ادامه دهید· Mineral admixtures such as silica fume and fly ash were added in 10% and 20% of the cement, respectively, to analyze the impact of steel fibre …
به خواندن ادامه دهید· to sulfate because pozzolanic reaction of SL increased the mortar's strength during the first several months. According to the strength loss, the improvement of mineral admixture on resistance to sulfate attack at lower temperature is outlined below, from best to worst: 60% SL, 8% silica fume, 30% SL, 20% fly ash, no admixture and 40% fly ash ...
به خواندن ادامه دهید· The blended cement specimens (C 3) exhibited greater sulfate resistance than any of the other specimens. 2. No particular relation has been observed between the sulfate resistance of mortars and the grinding process. 3. At 36 months, the strength reduction for mixes C and E in MgSO 4 is marginally lower than in Na 2 SO 4. For specimen D tested ...
به خواندن ادامه دهید· The use of mineral admixtures improved the sulfate resistance of mortars. However, a relatively great amount of migrated sulfate as well as expansive sulfate products (gypsum and ettringite) were still found in the blended cement mortars under the electrical field, for which their deterioration was also notable.
به خواندن ادامه دهید· Pre-stressed high-strength concrete piles (PHCP) are widely used in the building industry in China. The main aim of our research was to investigate the utilization of quartz powder, fly ash, and blast furnace slag as mineral additives to prepare PHCP mortar. The samples were prepared using steam and autoclaving steaming. The influence of minerals on the sulfate …
به خواندن ادامه دهید· In this study, the changes in mass, compressive strength, and length of blended mortars were analyzed to investigate their sulfate resistance according to the ground granulated blast furnace slag (GGBFS) blending ratio …
به خواندن ادامه دهید· Highlights. We studied the effects of mineral admixtures on sulfate attack of mortar bars. The use of mineral additives significantly reduced the expansions. The effectiveness of nano silica in limiting the expansions was very significant. Use of mineral additives for enhancing the sulfate resistance is important. Previous article.
به خواندن ادامه دهید· In this study, the mechanism which underpins the different interactions of chalcopyrite, a primary copper sulfide mineral, and chalcocite, a secondary copper sulfide mineral, with bentonite, a clay mineral, during the grinding with stainless steel media was investigated by a range of techniques including XPS (X-ray Photoelectron Spectroscopy) analysis, electrokinetic …
به خواندن ادامه دهیدMineral Co.affiliated with FRS Co. Address: Unit#E,2nd Floor No.55,Allameh Tower, North Allameh St, East Sarv St.kaj Square,Saadat-Abad Ave,Tehran, Iran. Calling Time: Saturday to Wednesday from 9 Am to 5 Pm & Thursday 9 Am to 1 Pm- Iranian local time is + 3.5 Hrs (GMT). ... Home > Products > Cements > Sulphate Resistance
به خواندن ادامه دهید· Highlights. •. Carbonation curing alleviated compressive strength loss of PC-CG pastes due to sulfate attack by 28–33%. •. Carbonation curing decreased the sulfate attack expansion of PC-CG paste by around 30%. •. Coupling effect of carbonation curing and CG benefits to sulfate attack resistance of concrete.
به خواندن ادامه دهید· Mineral admixtures have shown to improve sulphate resistance of cements and the composition of clinker, fineness and type of grinding along with the admixture levels,,,,,,, . In a previous study of the first two authors, the sulphate resistance of blended cement incorporating basaltic pumice and ground blast furnace slag has been ...
به خواندن ادامه دهید· Mineral admixtures can improve the sulfate resistance performance of cement-based materials via synergy effect of reducing C 3 A content, pozzolanic reaction and micro-aggregates filling. However, the improper content of slag in cement-based materials has a negative effect on the sulfate resistance performance as active Al 3+ reacts with SO 4 2 ...
به خواندن ادامه دهیدSulfate resistance is believed to be lower for concrete with RA. Hansen (1986) reported a decrease of strength after sulfate attack of 18%–60% when testing RA issued from 25 different original concrete. Other researchers reported a lower decrease of 1%–9% ( Gallia, 1999 ). Bulatović et al. (2017) tested eight mixes with coarse NA and RA ...
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