In this section the influences of water binder ratio the total amount of cementitious materials sand ratio and different fly ash content on the long term performance and durability of C35 machine made sand pavement concrete such as workability mechanical properties electric flux dry shrinkage early crack resistance and so on are studied
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— Manufactured sand crushed from stone or gravel also known as machine made sand artificial sand or crushed stone sand has been used as a substitute of natural sand in concrete [1] [2] [3] This is also becoming a global trend to produce concrete by using manufactured sand in the safeguarding of limited natural sand resources [4] [5] [6
The preparation method of machine made sand makes its particle shape rough and sharp large porosity large specific surface area and high content of stone powder resulting in a big difference between machine made sand concrete and natural river sand concrete and the changes of its performance indicators will also affect
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— To prevent larger cracks in concrete though follow the below steps Get the water ratio right If you re pouring concrete yourself be extra careful of the water to concrete ratio Even a slightly wetter mix will lead to weaker concrete Allow to cure Concrete takes about a month to fully cure but is most sensitive in the first week
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— Machine made sand self produced high quality machine made sand was produced by the parent rock of Pingkan tun nel excavation The compressive strength of the parent rock was 102 MPa the apparent density was 2723 kg/m 3 and the moisture content was % The crushing index of machine made sand was 18% the methylene
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— In the construction of cem ent concrete pavement the dr y shrinkage is the main cause of shrinkage Application analysis of road concrete machine made sand[J] Journal of Tr ansportation
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— In the recent two decades the progressive collapse of reinforced concrete RC frame structures attracted unprecedented research interests in the structural engineering community Experiments are regarded as an essential method in this field since actual cases can barely provide sufficient and effective data to support rigorous research
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— Building construction collapse in Nigeria has become a subject of international concern in recent times due to numerous lives and properties being wasted yearly
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— Iron tailings powder ITP is a kind of solid waste which pollutes the environment without any treatment The application of ITP in cement concrete is a good choice In this study the influence of ITP on the flowability compressive strength chloride ion permeability and the attenuation of the performance of cement concrete during
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— With the depletion and increasing demand of river sand machine made sand could be used more and more in concrete In order to improve the properties of machine made sand concrete the effects of the aggregate micro fines AMF content aluminum sulfate and polypropylene fibers PPF on the slump compressive strength
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— Extreme temperature can cause cement casing debonding Portland cement is brittle in nature and susceptible to cracking and shrinkage due to thermally induced stresses Shadravan et al 2015 In addition cement strength retrogression and deterioration at elevated temperature pose vital concerns for the prolonged service life of
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— portions and economy Properties of fine aggregate sand affect concrete prop erties such as durability strength thermal properties unit weight and surface friction River sand deposits consist of gravel and sand that can be readily used in concrete with minimal or no processing Aggregates are usually washed and
— This paper proposes a prediction of the compressive strength of concrete with manufactured sand MS concrete based on an ensemble classification and regression tree En CART method A data set containing 1 350 original measured strengths of 328 concrete mixtures from actual engineering projects were used for training and testing
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He provides professional engineering opinions regarding the cause origin and duration of damage to properties and directs geotechnical and materials testing field personnel to evaluate the subsurface conditions of future development sites to provide site preparation soil remediation and foundation recommendations
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