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Description:Feb 09, 2014018332A total of 27 concrete mixtures with three replicates 81 specimens were considered by varying the levels of key factors affecting compressive strength of concrete, namely, watercementitious materials ratio 0.38, 0.43, and 0.48, cementitious materials content 350, 375, and 400 kgm 3, and finetotal aggregate ratio 0.35, 0.40, and 0.45 ...
SourceAccess Heavy Industries Co., Ltd. China(Mainland)
Feb 09, 2014018332A total of 27 concrete mixtures with three replicates 81 specimens were considered by varying the levels of key factors affecting compressive strength of concrete, namely, watercementitious materials ratio 0.38, 0.43, and 0.48, cementitious materials content 350, 375, and 400 kgm 3, and finetotal aggregate ratio 0.35, 0.40, and 0.45 ...
The concrete mixtures incorporate either basalt or crushed limestone, aggregate sizes of 12 mm h in. or 19 mm Y. in., and coarse aggregate contents with aggregate volume factors ACI 211.191 of0.75 and 0.67. Watertocementitious material ratios range from 0.24 to 0.50.
Asphalt pavement is a complex material that consists of aggregates, air voids and asphalt. The performance of asphalt concrete mixtures is influenced by its internal structure, which refers to the arrangement of aggregates and their associated voids. This paper focuses on developing computer automated image analysis procedures and parameters to quantify the aggregate orientation and ...
Basic concrete properties like compressive strength, flexural strength, workability etc are explained here for different combinations of recycled aggregate with natural aggregate. Codal guidelines of recycled aggregates concrete in various countries were stated here with their effects, on concreting work. In general, present status of
This research investigates the effect of using recycled concrete aggregate RCA as a partial replacement of natural aggregate NA on the mechanical and durabilityrelated properties of a cementstabilized recycled concrete aggregate CSR mixture. In this case, mixtures were prepared with 0, 40, 70, and 100 by weight RCA to replace NA, and cement contents of 4, 5, and 6 were …
Coarse aggregates Fig. 52 consist of one or a comCHAPTER 5 Aggregates for Concrete bination of gravels or crushed stone with particles predominantly larger than 5 mm 0.2 in. and generally between 9.5 mm and 37.5 mm 3⁄ 8 in. and 11⁄ 2 in.. Some natural aggregate deposits, called …
Recycled aggregate concrete models with or without initial crack are investigated. Results of using an extended finite element with both linear elastic fracture mechanics and cohesive segment approaches are discussed as well. v DEDICATION This is dedicated to my loving parents, Zhiqiang Yang and Jun Wei, who always support, ...
The MOE value of concrete depends on coarse aggregate stiffness, elastic properties of constituent materials, and interfacial zone connecting the paste and coarse aggregates . Islam et al. 24 observed that the MOE values were between 11.4 GPa and 12.6 GPa for OPSC at air curing, and between 12.7 GPa and 15.4 GPa at water curing.
The aim of Cement and Concrete Research is to publish the best research on the materials science and engineering of cement, cement composites, mortars, concrete and other allied materials that incorporate cement or other mineral binders. In doing so, the journal will focus on reporting major results of research on the properties and performance of cementitious materials novel experimental ...
Mar 01, 1980018332Q. How much stronger is a floor made with 12inch aggregate than one with 34inch aggregate if all other ingredients remain the same A. If the quantities of coarse aggregate, fine aggregate, cement and water are the same for both mixes, the mix with l l2inch aggregate will have greater slump and will probably bleed more.
Includes original investigations, observations, scholarly inquiries, and reviews. Cement, Concrete and Aggregates CCA 19792004 Backfile. Discusses the properties of concrete and its constituent materials. Journal of Composites, Technology amp Research JCTR 19782003 Backfile.
Fine aggregate is on of the major constituents of concrete which can influence concrete mix design substantially. Various factors such as fine aggregate fineness modulus, moisture content, specific gravity, and silt content affect the mix proportions of concrete. Fineness modulus specifies how much fine aggregate is required in a given mix design. Fine aggregate moisture …
Influence of Aggregate Size on Concrete Strength and Shrinkage Fig. 1 Drying shrinkage of hardened concrete in relation to cement and water content in concrete mixture based on Fig. 8 in Reference 5 Note 1 bag 94 lb of cement 1 lb 0.45 kg Fig. 2 Influence of wc and aggregate …
Concreteoperational thinking depicts an important aspect of cognitive development. A promising approach in promoting these skills is the instruction of strategies. The construction of such instructional programs requires insights into the mental operations involved in problemsolving. In the present paper, we address the question to which extent variations of the effect of isolated and ...
Sep 01, 2020018332Aggregates are the major constituent ingredient in concrete, making up 60 to 70 of the volume of concrete. Aggregates influence the workability of plastic concrete and also the durability, strength, thermal properties, and density of hardened concrete. Particle size divides aggregates into two categories fine and coarse. Most fine aggregates are sand and contain particles smaller than 38 ...
The use of recycled concrete aggregate RCA in concrete as partial and full replacements of natural coarse aggregate is growing interest in the construction industry, as it reduces the demand for ...
Apr 12, 2019018332For the nonfiberreinforced concrete specimens, the mean value of compressive strength of natural aggregate concrete marked as NC was 44.52 MPa, which was higher than that of FRC01 by 11.6. Additionally, in cases of fiberreinforced recycled concrete, the relative strength of all specimens was lower than NC, from 7.35 up to 13.7.
Coarse aggregates Fig. 52 consist of one or a comCHAPTER 5 Aggregates for Concrete bination of gravels or crushed stone with particles predominantly larger than 5 mm 0.2 in. and generally between 9.5 mm and 37.5 mm 3⁄ 8 in. and 11⁄ 2 in.. Some natural aggregate deposits, called …
to make highstrength concrete, it is easier to do so with coarse aggregates below 12.5 mm Y, in. ACI 36395. There has not been much research on the effects of coarse aggregate content
Concrete cubes and beams were produced in accordance with BS 1881108 1983 and ASTM C293 with varying aggregate sizes 9.0mm, 13.2mm, 19mm, 25.0mm and 37.5mm, using a …
Jan 01, 2014018332The calculated tensile stress in the slab at flexural failure was underpredicted by the beam flexural strength by a factor of 1.5 for virgin aggregate concrete and 1.9 to 2.7 for concrete with recycled aggregates these findings demonstrate that the beam flexural strength results are not always reliable predictors of slab capacity, especially ...
The aim of Cement and Concrete Research is to publish the best research on the materials science and engineering of cement, cement composites, mortars, concrete and other allied materials that incorporate cement or other mineral binders. In doing so, the journal will focus on reporting major results of research on the properties and performance of cementitious materials novel experimental ...
Mar 01, 1980018332Q. How much stronger is a floor made with 12inch aggregate than one with 34inch aggregate if all other ingredients remain the same A. If the quantities of coarse aggregate, fine aggregate, cement and water are the same for both mixes, the mix with l l2inch aggregate will have greater slump and will probably bleed more.
Jul 14, 2020018332The natural coarse limestone aggregate was 100 replaced with coarse LRCA and HRCA. As a result of the study, the use of 100 HRCA and 100 LRCA instead of limestone coarse aggregate in the concrete adversely affected its mechanical and physical properties.
Jan 25, 2016018332Supply chain management that considers the flow of raw materials, products and information has become a focal issue in modern manufacturing and service systems. Supply chain management requires effective use of assets and information that has far reaching implications beyond satisfaction of customer demand, flow of goods, services or capital. Aggregate planning, a …
Fine aggregate in the mix proportion of concrete was replaced with plastic bag waste sand at 10, 20, 30 and 40 whereas other concrete materials remain same for all four mixes. In fresh properties of concrete it was observed from the results of slump test that with increase of waste content workability of
This study investigates the effect of aggregate size on the compressive strength of concrete. Two nominal mixes, that is, 124 and 136 were used in the study. Concrete cubes were produced with 6, 10, 12.5, 20 and 25 mm aggregates for the two nominal mixes and they were subjected to compressive strength test after curing for 7, 21, 28 and 56 ...
Aggregates make up the largest volume 66 to 78 of material used in concrete. The aggregates must be clean, properly graded, hard, strong, durable, and free from chemicals or coatings of clay or other foreign materials that may inhibit the bond between the cement and aggregate.
Jun 25, 2019018332The unit weight of the concrete ranged from 2365 to 2175 kgm 3, depending on aggregate content Figure 6.Increasing the recycled aggregate content reduces the unit weight and density of the concrete, resulting in lighter concrete Figure 6.The unit weights of the 15, 20, and 25 mixes were reduced by 8, 11, and 11.5, respectively, compared to plain concrete.
DOI 10.1016J.ENGSTRUCT.2012.04.006 Corpus ID 110543826. Recycled aggregate concrete Experimental shear resistance of slabs without shear reinforcement articleSchubert2012RecycledAC, titleRecycled aggregate concrete Experimental shear resistance of slabs without shear reinforcement, authorS. Schubert and C. Hoffmann and A. Leemann and Konrad Moser and M. …
Oct 20, 2019018332Most of the previous studies have focused on the mechanical behaviours of soil or concrete after adding crumb rubber under ambient temperature. For example, based on the studies of Bisht and Ramana , fine aggregates of concrete mixtures were replaced by rubber within a range of 0–5.5. It was found that both compressive and flexural strengths ...
to make highstrength concrete, it is easier to do so with coarse aggregates below 12.5 mm Y, in. ACI 36395. There has not been much research on the effects of coarse aggregate content
May 01, 20070183321. Introduction. To obtain good quality concrete using recycled aggregate it is necessary to follow the minimum requirements defined by the BCSJ , RILEM , DIN 4226.100 , and prEN 132422002 .Acceptable properties of aggregates are an elemental base for concrete quality, however adequate mix proportions and concrete production methods are highly important in concrete quality too.
