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Showing 1 to 20 of 22 for “"curing period"”.
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An investigation of the effects of the partial loading of concrete during the early curing period on the twenty-eight day ultimate strength
… of the effects of partial loads during the early curing period on concrete beams. 2. A study of the effects of partial loads during the early curing period on various mixes of concrete. 3. A study of conditions actually existing in structures. 4. A study of sections of concrete cylinders cut in …
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Effect of Admixtures, Chlorides, and Moisture on Dielectric Properties of Portland Cement Concrete in the Low Microwave Frequency Range
… moisture, type of aggregate, water/cement ratio, curing period, admixture type (microsilica, superplasticizer, and shrinkage admixture), and chloride content on the dielectric properties of PCC. Measurements were conducted in the time domain and converted to the frequency domain using Fast Fourier …
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Preliminary investigation of shrinkage due to change in moisture content of high and low pressure cinder block
… (4) shrank only 0.51 inches per 100 feet with a curing period of only three days whereas the Seri88 I Group (2) low pressure units made of limestone and cement shrank 0.86 inch per 100 feet with a curing period of 28 days. The foregoing observation suggests that the use of silica in place of …
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Constitutive behaviour of cement treated marine clay
… undrained and drained conditions. After a 7-day curing period, the volume-mass properties, unconfined compressive, isotropic compressive, undrained and drained triaxial compressive tests were conducted to evaluate the mechanical behaviour of these specimens. The results show that the level of …
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Laboratory evaluation of asphalt-portland cement concrete composite
… evaluated at one, three, seven, and 28 days of curing. The evaluated physical properties include stability, indirect tensile strength, compressive strength, and resilient modulus, while the evaluated durability properties include water sensitivity, freeze-thaw and chloride intrusion resistance. …
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Development of a short test for the identification of aggregates causing poor concrete performance when frozen
… of air-entrained concrete specimens, teats on curing period of air-entrained concrete specimens exposed to freeze-thaw cycles, and mercury-intrusion porosimeter tests of individual aggregate particles were conducted. Several parameters have been obtained from these tests. They are: durability …
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Effects of Curing Temperature and Pressure on the Chemical, Physical, and Mechanical Properties of Portland Cement
… of Portland cement as well as the effects of curing temperature and pressure on its various properties. An innovative test apparatus has been developed in this study to cure and test cement paste specimens under in-situ conditions, such as down-hole in oil wells with high temperature and high …
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A study on chemical stabilization of Oil Sands Mature Fine Tailings
… of these stabilizers at different dosages and curing durations is assessed by conducting a series of laboratory tests in terms of the undrained shear strength (Su) and solid content (S%), plasticity and pore fluid chemistry. The gel time and gel syneresis of silicate grouts are studied. …
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Lime, cement, and lime-cement stabilization of a clay soil
… after compaction and after a four-day curing period in a 100 per cent humidity curing room. Atterberg limit tests were also run at the various percentages of additive. The laboratory test results indicate: 1. For cured specimens containing a stabilizing agent, the greatest four-day …
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Sound absorption characteristic of lightweight brick containing Expanded Polystyrene Beads (EPS) and Palm Oil Fuel Ash (POFA)
… EPS and POFA content was 1320.52 kg/m3 after a curing period of 56 days. Bricks incorporated with varying percentages of EPS and POFA have strength values between 3.7 MPa to 21.3 MPa which are acceptable for load bearing and non-load bearing structures. The water absorption values recorded for …
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Characterization of Recycled Concrete for use as Pavement Base Material
… of an RCM pavement base layer over a 1-year period. The testing included a dynamic cone penetrometer, ground-penetrating radar, a heavy Clegg impact soil tester, a soil stiffness gauge, and a portable falling-weight deflectometer. The laboratory testing indicated that the demolition material …
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Stabilization/solidification of lead contaminated soil using cement incorporated with sugarcane bagasse
… of lead in the TCLP and SPLP test after the curing period of 28 days were detected to be below the leachability limit as regulated by the United States Environmental Protection Agency (US EPA). As a whole, the results obtained from testing showed that soil samples : 7.5% cement : 7.5% SCB is …
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Effect of Concentration of Sphagnum Peat Moss on Strength of Binder-Treated Soil
… OM, binder content, water-to-binder ratio, and curing time were tested for unconfined compressive strength (UCS). Least-squares regression was used to fit a predictive equation, modified from the findings of previous researchers, to this data. The equation estimates the UCS of a deep-mixed …
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Development of High performance Concrete Composites Using Class F Fly Ash and PCC Bottom Ash, and a Statistical Model to Predict Compressive Strength of Similar Concrete Composites
… strength of 8,000 psi (55 Mpa) after 28 days of curing in water with a slump of 4±½” (102mm ± 13mm) and air content between 4 and 6 percent. In order to achieve the targeted air content, an air entraining agent DARAVAIR 1400 was used. The water-cement ratio of 0.3 was maintained throughout the …
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Structure, strength and defect characterisation of cement based materials.
… be effectively used to alter the properties of a curing cement mortar. This work has also demonstrated that ultrasound can be successfully used to determine the compressive strength of concrete from an early age. The ability to pre-determine the strength of concrete through correlation with NDT …
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Influence of curing on the properties of concretes and mortars in hot climates
… deals with the influence of initial curing periods and different curing environments, similar to those found in Middle Eastern countries, on the pore size distribution, permeability, water absorption and compressive strength of cement mortars and concretes made with and without …
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Stabilisation of clay subgrade soils using ground granulated blastfurnace slag
… potential and UCS were measured after longer curing periods. Four analytical techniques {X ray diffraction, scanning electron microscopy, differential thermal analysis and nuclear magnetic resonance (NMR)} were used to identify the reaction products of the clay fraction of the test soil mixed …
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Engineering properties of sulphate-bearing clay soils stabilised with lime-activated ground granulated blast furnace slag (GCBS)
… substantial strength increase even after short curing periods (up to 12 weeks). This increase in strength is more pronounced if curing is at elevated temperatures (30 °C). The presence of sulphates (6% gypsum=2.73% SO<sub>3</sub>) resulted in an accelerated increase in the strength development …
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EFFECTS OF DEICING SALTS ON THE DURABILITY OF CONCRETE INCORPORATING SUPPLEMENTARY CEMENTITIOUS MATERIALS
… concrete mixtures (156 specimens) were cast with curing periods of 14 or 28 days to investigate scaling over 56 cycles in accordance with Quebec test BNQ NQ 2621-900 using NaCl or CaCl2. Mixtures are considered durable if the average cumulative mass losses are less than the BNQ NQ 2621-900 failure …
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Development of technology for the construction of low-cost road embankments
… regime to be applied to a given specimen, a curing pattern was defined and samples were wrapped in cling film to minimise moisture losses. At the end of each curing period of 7, 14, 28, 56 and 90 days, one of the experimental procedures which ranged from Unconfined Compressive Strength, Water …
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