An investigation on the use of coarse volcanic scoria as ...

The 28 day's compressive strength values of the mixtures containing coarse volcanic scoria aggregates (MCVS1, MCVS2 and MCVS3) were 28.29, 47.58 and 61.16 MPa. It was seen from these results that the compressive strengths of the mixtures containing coarse volcanic scoria aggregates increase with the proportion of fine volcanic scoria.

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Properties of Scoria | Physical | Thermal

The hardness of Scoria is 5-6 whereas its compressive strength is Not Available. Streak is the color of rock when it is crushed or powdered. The streak of Scoria is white whereas its fracture is conchoidal. Luster of Scoria is the interaction of light with the surface of Scoria. Luster of Scoria is subvitreous to dull. Scoria cleavage is perfect.

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HIGH-STRENGTH STRUCTURAL LIGHTWEIGHT CONCRETE

and strength of rock contain freezing - thawing properties, and thermal conductivity as well. How could we achieve this? We would have to change the composition: the weight or density. One way is to incorporate a lightweight aggregate. Natural lightweight aggregates such as pumice [most widely used], scoria, volcanic cinders, tuff and diatomite.

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Effect of Scoria on Various Specific Aspects of ...

Keywords: scoria, lightweight concrete, thermal and acoustic properties. 1. Introduction Structural lightweight aggregate concrete is made with lightweight aggregates, as defined in ASTM C330. This variety of concrete has a minimum 28-day compressive strength …

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Soil-Cement FAQs

Should the acceptance criteria of completed soil-cement be based on compressive or flexural strength test results of in-place cores or beams? . What are the different types of soil-cement materials? What is micro-cracking (or pre-cracking) of cement-treated bases? Which product is better—portland cement or hydrated lime—in stabilizing clay ...

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CONCRETE - boral.com.au

Strength of concrete The compressive strength of concrete is measured by how much force is required to crush it, this is important in the design of structures. In pavements and other slabs on the ground, the design is usually based on flexural strength, (i.e.; how much force the concrete can withstand in bending before it breaks).

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Effect of Scoria on Various Specific Aspects of ...

Sep 14, 2015· A compressive strength of 19 MPa corresponded to a density of 1800 kg/m3; compressive strengths from 10 to 18 MPa mapped to densities ranging from 1300 to 1700 kg/m3. The thermal conductivity of mixed concretes without scoria reached a maximum value of 0.268 W/m K.

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(PDF) Effect of Powdered Scoria Rocks on the Fresh and ...

At 7 days, the compressive strength varied between 46 and 82 MPa while at 28 day it varied between 58 and 90 MPa. These relatively high compressive strength values are encouraging even at a high volume of SR powder (i.e. at a replacement level of 50%; the compressive strength achieved was approximately 58 MPa).

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Engineering properties of scoria concrete as a ...

The compressive strength and modulus of rupture for 28 – days samples of scoria concrete was 20.42N/mm 2 and 6.08N/mm 2 respectively. This compares well with plain concrete with compressive strength of 22.22N/mm 2 and flexural strength of 7.14N/mm 2. The results show that scoria concrete has sufficient strength to be used as a construction ...

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(PDF) The effects of scoria and pumice aggregates on the ...

The effects of scoria and pumice aggregates on the strengths and unit weights of lightweight concrete. ... and PLWC mixtures developed 44.1, 30.5, 27.6, 23.3, 15.8 MPa compressive strength ...

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Applicability of Artificial Neural Networks to Predict ...

For example, volcanic scoria makes a significant contribution to reducing permeability of concrete despite the lower compressive strength. (2) In terms of concrete durability, the binders containing ≥ 25% VS were better than the control binder and globally gave the best performance among all the replacement levels.

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FUZZY LOGIC MODEL FOR PREDICTION OF COMPRESSIVE …

In this study, a new fuzzy logic model has been devised to predict compressive strength of lightweight concrete made with scoria aggregate and fly ash under different curing conditions. Compressive strength and ultrasonic pulse velocity (UPV) were determined at the 3, 7, 14 and 28 day curing period. The obtained results from compressive strength

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Non-structural lightweight concrete with volcanic scoria ...

Mar 15, 2017· Abstract •Non-structural lightweight concrete (NSLWC) with scoria aggregates was characterized.•Its behavior was compared to that of common NSLWC with expanded clay and EPS aggregates.•NSLWC with scoria could show, at least, similar compressive and tensile strength.•Also had less shrinkage, higher punching strength and better behavior at high temperatures.•However, …

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Compressive Strength of Scoria Added Portland Cement ...

Preliminary results indicated that the compressive strength of the concrete mixtures with scoria added up to 30% exceeded the strength of the conventional mixture at 3, 7, 28 and 91 days, whereas the compressive strength of the 40 and 50% scoria added concrete mixtures decreased at 3, …

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FLOWABLE FILL - Firth Concrete

Flowable Fill™ is a controlled low strength mix of sand, cement and water. Either fl yash or chemical admixtures are added to form small spherical particles which lubricate the mix, increasing its cohesiveness and fl owability. Flowable Fill™ is a fl owable cohesive slurry which can be used as a fi ll or backfi ll material.

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An Evaluation of Concrete Making Properties of Scoria ...

Compressive strength of scoria-aggregate concrete was examined by introducing controlled variables into the mix proportions. A mix design method for accurate mix design was formulated and was analyzed for consistency and feasibility.

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STRUCTURE magazine | Cinder Concrete Slab Construction

The test consisted of a fire, water, and load test of a cinder concrete slab with 5-foot and 8-foot spans and reinforced with triangular wire mesh. The cinder concrete contained "boiler cinders". Specimens were load tested to a compressive strength of 1,000 (pounds per square inch (psi).

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Properties of Concrete Using Scoria Lightweight Aggregate ...

Bulk density, water absorption and a sieve analysis was conducted on the scoria aggregate prior to mix design for concrete. LWSAC has produced a compressive strength of 30.50MPa at 28 days compared to the control concrete had 38.93MPa. Replacing 15% of Portland cement using fly ash has increased the compressive strength to 41.14MPa at 28 days.

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Influence of scoria and pumice on key performance ...

The compressive strength, modulus of rupture, shrinkage, permeability, and thermal stability of the concrete were not compromised at this substitution level. The 28 days modulus of rupture, shrinkage, and compressive strength for SN and PN at 10% substitution were 6.0 and 6.4 MPa; 0.02 and 0.01 mm; 44.2 and 43.1 MPa, respectively.

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Properties of Obsidian | Physical | Thermal

Rocks are rated on the on the Moh's Hardness Scale which rates the rocks on the scale from 1 to 10. Rocks with hardness 1-3 are soft rocks from 3-6 are medium hardness rocks and 6-10 are hard rocks. The hardness of Obsidian is 5-5.5 whereas its compressive strength is 0.15 N/mm 2. Streak is the color of rock when it is crushed or powdered.

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Effect of Powdered Scoria Rocks on the Fresh and Hardened ...

Vol. X, No. Y Fares et al.: Effect of Powdered Scoria Rocks... 6 Hardened Properties Compressive Strength The compressive strength was measured at 7 and 28 days. The obtained results are shown in Figure 4. At 7 days, the compressive strength varied between 46 and 82 MPa while at 28 day it varied between 58 and 90 MPa.

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Thermal Resistance of Concrete in Wood Safe and Scoria

Thermal Resistance of Concrete in Wood Safe and Scoria 1 Eddie Franck Rajaonarison 2 Alexandre Gacoin 3 Bam Haja Nirina Razafindrabe 4 Vincent Emile Rasamison 1Sciences of Materials and ... 3.23 2 days compressive strength (MPa) 21.0 CaO 62.11 7 days compressive strength (MPa) 28.0 MgO 1.98 28 days compressive strength (MPa) 42.0 Na 2

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Compressive Strength Of Gravel Itself - Concrete, Stone ...

Aug 13, 2014· In any case, the compressive strength of an individual gravel particle, if it is stone, is very high, often 20,000 pounds per square foot or higher. You are probably not talking about the compressive strength of a single particle, rather you are probably interested in the compressive strength of a layer of gravel.

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Properties of concrete using scoria lightweight aggregate ...

scoria, Cengiz et al (2003) reported that by replacing 10% of Normal Portland Cement (NPC) with silica fumes, a compressive strength of 38.9MPa was achieved at 28 days whilst without silica fumes reached 28MPa. The increase in strength was described due to the filler effect of the binder in the

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Compressive Strength of Scoria Added ... - ResearchGate

Preliminary results indicated that the compressive strength of the concrete mixtures with scoria added up to 30% exceeded the strength of the conventional mixture at 3, 7, 28 and 91 days, whereas ...

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Mechanical Properties of M 25 Grade Concrete Made With ...

minimum compressive strength of 17MPa is defined as structural lightweight concrete (ACI 213R-87, 1998). Structural lightweight aggregate concretes were measured as unconventional to concretes made with dense natural aggregate because of the relatively high strength to …

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Effect of Adding Scoria as Cement Replacement on ...

May 15, 2015· The compressive strength at 7 days decreases from 24.9 to 16.0 MPa when CEM I and CEM II/B-P with 35 % of scoria were used, respectively. The relative compressive strength after 2 days curing with 35 % of scoria is only 63 % of that of CEM I specimens.

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Green Home Building: Light-weight Concrete

Light-weight Concrete. Lightweight concrete, weighing from 35 to 115 pound per cubic foot, has been used in the United States for more than 50 years. The compressive strength is not as great as ordinary concrete, but it weathers just as well.

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Scoria Engineering Lebanon | Laboratory Testing ...

SCORIA is a multiple discipline engineering Services Company that provides the civil engineering industry with technology, equipment, and expertise. Our services are founded to support feed, design and construction phases through providing geo-technology, …

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Compressive Strength of Scoria Added Portland Cement …

Compressive Strength of Scoria Added Portland Cement Concretes A.Ozvan a, M. Tapan 1,♠, O. Erik, T. Efea, T. Depcia, a Natural Resources of Van Lake Basin Research and Application Center ...

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