Mixture Of Fine Aggregates Research Articles

Computational renormalization for thermal conductivity of porous asphalt concrete based on hybrid finite element-neural network method

Thermal conductivity of porous asphalt concrete (PAC) directly affects PAC pavement temperature field, which is closely related to the heat island effect in summer and pavement icing in winter. Due to the large and complex pores and the uneven surface in PAC, there is measurement uncertainty using traditional laboratory tests. In this study, a finite element-neural network (FE-NN) method was proposed to predict the thermal conductivity of PAC based on the three-dimensional (3-D) heterogeneous structure. Additionally, laboratory tests were conducted to measure the thermal conductivity of PAC, fine aggregate mixture (FAM), and basalt aggregate. The results served as input parameters for the FE-NN method and were used to verify its accuracy. Based on the validated method, various factors affecting the thermal conductivity of PAC were analyzed. The analysis results show that, compared to the transient plane source (TPS) method, the backcalculation method can achieve results similar to those obtained with the TPS method for basalt aggregate and FAM, but provides more stable measurements when applied to PAC. The accuracy of the FE-NN method is acceptable, with relative errors of 1.92∼4.34 % compared to the experimental results. Besides, 2-D structural models tend to underestimate the effective thermal conductivity of PAC, with values 83.2∼84.1 % lower than those calculated by 3-D models. When the representative volume element (RVE) sizes are larger than 256×256×256, the variances show little differences and are acceptable. Furthermore, typical aggregate thermal conductivity values were used as input, revealing a nonlinear increase in the effective thermal conductivity of PAC. When the void content increased from 18 % to 24 %, the effective thermal conductivity of PAC decreased by 19.83 %. The effective thermal conductivity of PAC changes more significantly with the thermal conductivity of the aggregate than that with the variation of porosity in an interval. The analysis findings provide insights for better evaluating the pavement temperature field and heat transfer to improve the PAC pavement material designs.

AN EXPERIMENTAL INVESTIGATION ON EFFECT OF CONCRETE BY USING PARTIAL REPLACEMENT OF EGG SHELL POWDER IN CEMENT ALONG WITH E-WASTE AS COARSE AGGREGATE

The imagination of a world without concrete isimpossible. It is a soul of infrastructures. Concrete is necessary to gain strength in structures. Conventional concrete, which is the mixture of cement, fine aggregate, coarse aggregate and water, needs curing to achieve strength. Concrete is a counterfeit material in which the totals both fine and coarse are reinforced together by the bond when blended with water. The solid has turned out to be so prominent and essential in view of its natural, concrete acquired an upheaval uses of cement. Concrete has boundless open doors for creative applications, plan and development methods. Its extraordinary adaptability and relative economy in filling extensive variety of necessities has made it is exceptionally focused building material. This project focuses on concrete, keeping importance to this, an attempt has been made to develop strength in concrete incorporating recycling waste. As part of the project cement partially replaced with egg shall powder and e- waste as coarse aggregate Comparative studies were carried out for compressive strength, tensile strength and flexural test for conventional and material concrete mixture introducing new recycling materials

Pengaruh Penggunaan Lapis Tipis Beton Aspal pada Lajur Tanjakan Preservasi Jalan

Asphalt, also known as bitumen, is a mixture of binders used as road preservation. On the BTS road preservation project package. Central Aceh/Nagan Raya – Lhok Seumot – Jeuram (MYC) uses a thin layer of Asphalt Concrete as a treatment for road damage. Asphalt concrete thin layer is a hot asphalt mixture that can be used as a surface layer on road pavement which functions as a road preservation layer. The problem raised and also a research is how the feasibility of a thin layer of asphalt concrete on an incline. The method used in this study is based on testing Job Mix Asphalt, Traffic Counting, and direct observation of asphalt work in the field as well as supporting data in the form of information from consultants or contractors. Asphalt concrete thin layers cannot be used on incline lanes because the asphalt road contains a very fine aggregate mixture. Comparison of thin layers of asphalt concrete with AC – BC using the Traffic Counting method explains that vehicles passing on roads using thin layers of asphalt concrete on the dominant incline lane are more vehicles unable to climb compared to vehicles passing on roads using asphalt AC – BC. The use of a thin layer of asphalt concrete cannot be used for incline lanes, but a thin layer of asphalt concrete is highly recommended for the use of asphalt roads in urban areas.

EFEKTIVITAS PENAMBAHAN SERAT POLYPROPYLENE TERHADAP KUAT LENTUR BETON GEOPOLIMER dengan SUPERPLASTICIZER

Geopolymer concrete is concrete composed of a mixture of coarse and fine aggregate without Portland cement binder. Fly ash is used as a substitute, because it contains a lot of silica and alumina. Geopolymer concrete has good strength and durability, but concrete also has disadvantages, namely brittleness, workability and often cracking due to tensile loads. Superplasticizer (SP) is used at 2% of fly ash weight to improve workability. The SP used is Sika viscocrete 1003. The addition of polypropylene fiber is one way to overcome brittle properties and the appearance of fine cracks in concrete. In this paper using Sika fiberforce 48mm polypropylene fiber which has a tensile strength of 465N/mm2(MPa) at a dose of 0%, 0.5%, 1%, 1.5% and 2%. The alkaline activator used is a mixture of NaOH and Na2SiO3 solutions. The molarity of the NaOH solution used is 8M with a ratio of NaOH/Na2SiO3 2: 3. From the test results, it is known that the influence of polypropylene fiber is effective for increasing the bending strength of geopolymer concrete. The bending strength value of geopolymer concrete with the addition of polypropylene fibers increased by 60.19%. The polypropylene fiber content will be maximum at a percentage of 0.5% of the total volume of the mixture.Keywords: Fiber, Flexural Strength, Fly Ash Geopolymer Concrete, Polypropylene, Superplasticizer

Pengaruh Penggunaan Lapis Tipis Beton Aspal pada Lajur Tanjakan Preservasi Jalan

Asphalt, also known as bitumen, is a mixture of binders used as road preservation. On the BTS road preservation project package. Central Aceh/Nagan Raya – Lhok Seumot – Jeuram (MYC) uses a thin layer of Asphalt Concrete as a treatment for road damage. Asphalt concrete thin layer is a hot asphalt mixture that can be used as a surface layer on road pavement which functions as a road preservation layer. The problem raised and also a research is how the feasibility of a thin layer of asphalt concrete on an incline. The method used in this study is based on testing Job Mix Asphalt, Traffic Counting, and direct observation of asphalt work in the field as well as supporting data in the form of information from consultants or contractors. Asphalt concrete thin layers cannot be used on incline lanes because the asphalt road contains a very fine aggregate mixture. Comparison of thin layers of asphalt concrete with AC – BC using the Traffic Counting method explains that vehicles passing on roads using thin layers of asphalt concrete on the dominant incline lane are more vehicles unable to climb compared to vehicles passing on roads using asphalt AC – BC. The use of a thin layer of asphalt concrete cannot be used for incline lanes, but a thin layer of asphalt concrete is highly recommended for the use of asphalt roads in urban areas.

Improvement of impact acoustic inspection for high-speed railway track slabs using time–frequency analysis and non-defective machine learning

Slab track is one of the most highly used ballastless track forms in Japan's high-speed railway system (Shinkansen) and is composed from track slabs (precast RC or PRC member), a filling layer (mixture of cement, asphalt emulsion and fine aggregates) and concrete bed. As they age, it has been reported that the supporting conditions of track slabs change due to damage in the filling layer that in turn affects running stability. It is necessary to evaluate supporting conditions of track slabs accurately during maintenance of slab tracks prior to signs of cracking. Some previous works show the usefulness of impact acoustics and non-defective machine learning using frequency response spectrums as feature values for evaluating supporting conditions of track slabs. In this study, we examine a method of non-defective learning to improve the evaluation of supporting conditions: time-frequency response characteristics of impact acoustics using time-frequency analysis and resulting spectrograms as feature values. As a result, we have improved accuracy rate (from 81.90 % to 86.72 %) and F-value (from 70.79 % to 78.75 %) more precisely than conventional method based on frequency response functions as feature values.

Pemanfaatan Limbah Cangkang Kerang sebagai Bahan Campuran dalam Pembuatan Paving Block (Literature Review)

Various innovations in making paving blocks are made to meet development needs. Where the advantages of paving blocks include easy maintenance, faster implementation time, and easy installation. Paving block is a composition of building materials made from a mixture of Portland cement, fine aggregate, and water. Paving block is one of the building materials that is in great demand by the public as a ground cover material, in addition to cement, asphalt, and concrete which is usually applied to parking lots, parks, school yards, and so on according to the needs of its users. The writing of this article, has the aim of reviewing the results of previous research in the form of compressive test results on the utilization of shell waste in the manufacture of innovative materials in the form of paving blocks, therefore the research method in this article is literature review, literature review does not only mean reading literature, but more towards an in-depth and critical evaluation of previous research on a topic.

The Effect of Fineness Modulus of Fine Aggregate on Concrete Compressive Strength

Concrete is the major material used for most civil engineering constructions like buildings, bridges, culvert, rigid road pavement, dam spillway and so on. Concrete is made from a mixture of cement, fine aggregate (sand), coarse aggregate (granite or gravel), and water. The fineness modulus is one of the physical properties of fine aggregates (sand). The Fineness Modulus (FM) of fine aggregates (sand) is obtained from the grading size distribution test as summation of percentage cumulative retained by series of sieves and divided the sum by 100. The fineness modulus of sand differs for each sand quarry. The purpose of this research is to analyze the effect of fineness modulus of fine aggregate (sand) from three different sand quarries on concrete compressive strength. The sand for the study were taken from three quarries (Ayegun, Akufo and Awotan) in Ibadan, Oyo state, Nigeria. The specimens of concrete used in the form of the cube measuring 150x150x150 mm amounted to 36 specimens. The compressive strength of concrete (fc’) targeted is 21 N/mm2 with W/C ratio 0.5. Concrete mix ratio of 1:2:4 was batched by weight. The results showed that the fineness modulus of sand strongly influence the compressive strength of concrete. The classification of sand type is differentiated based on the results of fineness modulus test on each sand sample. Sand fineness modulus (FM) of Ayegun quarry is 2.64 called medium sand (zone 2). Sand fineness modulus of Akufo quarry is 2.35 called mild sand (zone 3), and, sand fineness modulus of Awotan quarry is 1.57 called fine sand (zone 4). Concrete compressive strength values of Ayegun, Akufo and Awotan quarries sand were 21.3 N/mm2, 22.4 N/mm2, and 20.5 N/mm2, respectively. The value of sand fineness modulus does not affect the increase in the concrete compressive strength. The best classification of fine aggregate to increase concrete compressive strength is mild sand (Akufo quarry) and all the sand samples meet the planned concrete compressive strength of 21 N/mm2.

Pengaruh Penambahan Variasi Limbah Serat Pelepah Pisang terhadap Kuat Lentur Beton

Concrete is a material that is often used for the construction of building structures, bridges and others. Concrete consists of a mixture of fine aggregate (sand), coarse aggregate (gravel), water and cement. In addition to these materials, concrete is usually also mixed with additional materials. In this study, stone banana stem fiber was used as an additional ingredient in the concrete mix. This study aims to determine the composition of the banana stem fiber mixture in concrete, as well as to determine the cracking behavior of the concrete during testing after the addition of banana stem fiber to the concrete mixture. The purpose of this study was to determine and analyze the results of the compressive strength test of concrete, normal concrete and banana fiber mixed concrete. The method used is an experimental method with variations of banana tree fiber, namely 0% (normal concrete); 0.25% and 0.5%. In this test, the specimen model was used, namely a test object measuring 60x15x15 cm. The tests carried out were the flexural strength of the concrete which was carried out after the concrete reached the age of 28 days and the shrinkage test which could be seen visually. From the results of the study it was found that the more the mixture of banana fiber waste, the flexural strength value of the concrete decreased, starting from normal concrete with a value of 49.73 MPa, a mixture of 0.25% with a value of 28.63 MPa, and a mixture of 0.5% with a value of 27.19 Mpa.

The Effect of Soaking K-300 Concrete Using Seawater on Concrete Quality

Concrete is a mixture of cement, fine aggregate, coarse aggregate, and water with or without additional ingredients to form a solid mass, its use is very common in building structures, but the final quality of the strength of the concrete depends on many factors, including the implementation of its manufacture. and immersion. The research aimed to determine changes in the quality of k-300 concrete and the maximum strength of concrete immersed in salt water. The research was carried out in the Laboratory of the Faculty of Engineering, University of 17 August 1945 Samarinda for 2 months. The stages of research activities are starting, literature study, preparation of materials and tools, testing concrete building materials in the laboratory, designing concrete mixes, making test objects/samples, evaluation, testing concrete compressive strength, conclusions, and reporting. Tests carried out in the laboratory include: (1) checking wear/abrasion of coarse aggregate using the Los Angeles method; (2) examination of coarse aggregate and fine aggregate sieve analysis; (3) examination of specific gravity and SSD absorption of coarse aggregate and fine aggregate; (4) checking water content; (5) checking mud and clay levels; (6) checking the bulk density of coarse aggregate, fine aggregate and mixed aggregate; (7) inspection of concrete slump experiments; (8) soaking concrete using seawater and freshwater; and (9) checking concrete compression strength. The research results show that: (1) The compressive strength of K-300 concrete soaked in seawater, namely 304,915 f'c, is lower than that soaked in fresh water, namely 308,580 f'c; and (2) differences in concrete compressive strength occur at old concrete ages (21 days and 28 days) but at young concrete ages (3, 7 and 14 days) there are no differences in compressive strength.

An Innovative Study on Utilisation of Pareva Dust and Quartz Sand in Concrete

Concrete the spirit of the infrastructures and it’s a combination of cement, water and coarse aggregate, fine aggregate and add mixtures. Sand and cement is consider as critical material in significant mix design due reality that collecting of cement and uncovering sand is impacting out. In case consider concrete the manufacturing of it release out CO2 and other green house gases and in other hand sand expulsion furthermore is lead us to stream bed declination, so most ideal choice for the both of materials ought to be taken vital notes. Through this paper an imaginative focus on utilization of Pareva Dust as a replacement to concrete and Quartz Sand as replacement to sand at different level (5%,10%15%) is utilized and assist with getting's mom earth. Through this examination paper study is given for the mechanical and quality properties of which guide as choice in concrete.

Experimental Examination on Use of Recycled Materials in Stone Matrix Asphalt

SMA (stone matrix asphalt or stone mastic asphalt) was initially discovered in German & European and countries as impermeable or highly resilient wearing surface for bridge decks. Generally, it consists of two parts, a binder rich mortar and a coarse aggregate. It is made by a mixture of crushed fine and coarse aggregates, stabilizer such as polymers or fibres, cement & mineral filler. In present work, an effort has been made to study the properties of Stone Matrix Asphalt mixes with cellulose fibre and using recycled pavement material as well as slag in partial replacement of stone aggregates as coarse and fine aggregate grades. This research project was done to check the usage of recycled pavement material in Stone Matrix Asphalt mixture by conducting Marshall test in the lab in which flow & stability value was examined along with other properties of mixtures. Here IRC -SP-79 specification, aggregate gradation is taken for stone matrix asphalt. Binder used is 60/70 penetration grade bitumen. Binder content is varied as 4%, 5%, 5.5%, 6%, and 7% by weight of aggregates and fibre used is optimum fibre content at 0.3% by the weight of aggregate. Key Words: SMA (Stone Matrix Asphalt), RAP (Recycled Asphalt Pavement)

Pengaruh Binder Akrilik terhadap Sifat Fisik dan Mekanik Mortar Polimer

Initial damage to the structure occurs in the outer layers of the affected surface exposure to the peat environment and the static and dynamic movement of the structure. To prevent structural damage, the latest technological innovations are needed in the use of mortar constituent materials to increase the strength of the mortar. Polymer mortar is a composite material formed from a mixture of fine aggregates, cement, water and polymer binders or binders with a certain level. The purpose of this study is to determine the effect of the use of acrylic binders on the physical and mechanical properties of polymer mortars and the influence of peat water on the future of the mortar. The substitution of acrylic binders with water consists of 3 substitutions, namely 20%, 30% and 40% and 0% as controls. The results of the search for acrylic binders on the mortar mixture obtained a minimum physical property value at 30% acrylic use in the 28-day test, namely. The porosity value of the mortar is 9.80%, the waterabsorption value of the mortar is 4.67% and 4.72%, and the sorptivity value of the mortar is 0.70. From the value of physical properties obtained the degree of tightness of the polymer mortar well with the use of acrylic binders in the mixture. For the mechanical properties of polymer mortar, compressive strength testing is carried out with optimum compressive strength at the use of 30% acrylic. The value of the compressive strength of the mortar is 33 Mpa.

Analysis Of Compressive Strength Of Foam Mortar With The Use Of Teratak Buluh Sand And Ringgit Sand

The core material in the manufacture of lightweight concrete (foam mortar) is influenced by the composition of the mixture of fine aggregate. The purpose of the study was to compare foam mortar with foaming agent using two types of fine aggregates from different sources, namely Teratak Buluh Sand, Kampar and Ringgit Sand, Indragiri Hulu. This study focuses on testing the properties of fine aggregate, flow value, bulk density and Unconfined Compression Strength (UCS) of foam mortar. The fine aggregate of Teratak Buluh has a mud content value of 0.50% while the ringgit sand silt content value is higher with a 1.92% mud content percentage value where the maximum silt content value is 3%. In this study, both types of aggregates had variations in the mixture of sand to cement, namely 18/82%; 16/84%; 15/85%; 14/86% and 12/88%. The flow value in a mixture of 14/86% Teratak Buluh Sand and a mixture of 12/88% ringgit sand has a flow value of 19.00 cm which is the highest value of the five variations. Teratak Buluh sand mixture of 14/86% has a higher value than the five variations, which is 781.67 Kg/m3 while ringgit sand has the highest density value of 758.12 Kg/m3 in a mixture of 12/88%. The value of Unconfined Compression Strength (UCS) using Teratak Buluh sand is superior when compared to the use of ringgit sand. The average value of the Unconfined Compression Strength (UCS) of lightweight foam mortar material from the use of mixed teratak buluh sand of 14/86% (1136.80 kPa) and 12/88% (1175.78 kPa) has the highest value which is close to the reference Unconfined Compression Strength (UCS) of the mixture. 15/85% (1253.73 kPa) while the mixture was 18/82%; 16/84% Teratak Buluh and 18/82%; 16/84%; 15/85%; 14/86%; 12/88% ringgit sand has the lowest f Unconfined Compression Strength (UCS) which does not meet the design Unconfined Compression Strength (UCS) of 1000 kPa and 800 kPa based on the SE-PUPR-46-SE-M-2015 specifications.

Effects of gamma rays on normal-high-density concrete

Concrete is one structural and shielding material used against ionising radiation. It is used in radioactive environment such as radiotherapy rooms and radioactive safe keeping. Optimise concrete is evaluated by its thickness and also course and fine aggregate. Mixture of course and fine aggregate in concrete and its grade play an important role as good radiation absorber. However, concrete with unsuitable mixture will display cracks and will cause radiation leakage which could harm the public’s health. Therefore, this research is carried out using normal concrete with high density to determine the optimal grade. Four grades of concrete were produced, with mixture of cement, water and course-fine aggregate i.e. limestone and silica sand. Attenuation coefficient is measured using gamma spectrometer NaI (Tl) and single channel analyser (SCA). Radiation source used are Cs-137 and Co-60with photon energies of 0.662 MeV, 1.173 MeV and 1.332 MeV. Calculation of attenuation coefficient for concrete with thickness of 2.6 cm, 5.2 cm, 7.8 cm, 10.4 cm dan 13 cm shows increase in attenuation coefficient (<1.0 cm-1) for each grade, namely M15, M25, M35 dan M45. The result shows optimum concrete grade is M35 as the attenuation coefficient, which is between 0.04 - 0.18 cm-1, is the lowest in comparison with the other grades. Thus normal high density concrete could be used as effective shielding material and viable.

A Study On the Hardened Properties of M25 Grade Concrete Using Carbon Fibers and Its Evaluation by NDT

Concrete is a mixture of cement, fine aggregate, coarse aggregate and water. concrete plays a vital role in the development of infrastructure buildings, industrial structures, bridges and highways etc. Leading to utilization of large quantity of concrete.The present project focuses on investigating characteristics of M25 grade concrete is choosen and aggregate mean size of 20mm is adopted Carbon fibers are added by 1% to the weight of cement.. It leads to examine the admixtures to improve the performance of concrete. The cubes, beams and cylinders are tested for both compressive, flexural, Concrete Core test, youngs-modulus strength tests were conducted for 7, 28, 56, 90 days and the results are compared to the conventional concrete. ND-Tests like rebound hammer and ultra-sonic pulse velocity were conducted. Cube specimens of size 150 mm, cylinder specimens of diameter 150,100 mm and height 300,150 mm respectively, beam specimens of size 100 mm and length 500 mm were casted.

Meningkatkan Kuat Tekan Beton Dengan Menggunakan Material Recycle Concrete Aggregate (RCA)

Concrete is part of the building structure used in various large-scale infrastructure projects. concrete composed mixture of cement, fine aggregate, coarse aggregate, and water. Concrete able to withstand compressive forces optimally, concrete also has a smaller tensile strength than steel structures. excessive use corals causes availability materials to be depleted, is necessary to innovate continuously with use RCA. RCA is waste concrete recycled into aggregates can be reused to make concrete. The purpose is to determine the compressive strength value in concrete by replacing coarse aggregates from concrete waste measuring 19.05 mm (sieve no. 3/4). The method used experimental method by making a test object form of a cylinder with tests including testing of moisture content, sludge content, wear, and compressive strength concrete. The results obtained a normal concrete slump value 11 cm. While the concrete waste 4.4 cm. From the results were obtained according to the plan where in normal concrete was worth 17,444 Mpa and in concrete with the use of coarse aggregates from concrete waste showed a compressive strength result of 24,653 Mpa. So that shows the use waste concrete material is able to produce good concrete quality with a higher compressive strength value than normal concrete

Effect of air void structure and mechanical properties of high strength fiber reinforced mortar composed with different construction sand species based on X-CT technology

The significant effect of desert sand on cement-based composites was observed in the previous investigation. However, how the composition of fine aggregate affects the formation of air void structure remains to be investigated. In this paper, mortars composed of five different sand mixtures were prepared, and the specific surface area (SSA) of the sand mixture with different content of fine aggregate was calculated. It was observed that the air void content decreased as the SSA value of the sand mixture increased. A negative-slope linear relation was observed between the SSA values and air void content in the composite construction sand fiber reinforced mortar system. With the increase of SSA, the air void number of every high-strength fiber reinforced mortar decreased from 12,446 to 6652. With the gradual increase of desert sand content, the count of air void number decreased. When the fine aggregate was completely desert sand, the air void content of the fiber-reinforced mortar dropped from 1.21% to 0.98%. Through the analysis of the 3D air void system, it can be concluded that the mixture of fine aggregate with different particle size distributions plays a positive role in optimizing the air void characteristics. Reasonable utilization of desert sand can significantly improve the pore structure characteristics and compressive strength of cement-based composites, which provides an effective theoretical basis for the development and utilization of desert sand resources.

Exploitation of plastic bags in roadway blocks

Plastics are an increasingly important component of urban solid waste. The disposal of waste materials, such as used plastic bags, has become a major issue. The vast amount of waste plastic bags collected in the twenty-first century has posed significant challenges for their disposal. The amount of waste plastic in the home is substantial and growing. Our results indicate cement blocks are ideal for laying and finishing pathways and streets because they are easy to lay and finish. This study was carried out on experimenting the substitute materials in the mixture of cement blocks a component of building materials which is normally manufactured using the mixture of cement, fine aggregate and water, following a certain ratio. A series of three different percentages of plastics bags were added with the mix and certain quantities were replaced by quarry dust instead of Fine aggregate. Tests were done on the blocks to study its compressive strength, split tensile strength the water absorption percentage and acid test. Both the test compressive and split tensile tests were conducted on the seventh and 28th day. Based on the results acquired, for compressive strength tests on the 28th day, the result a good indication is that the blocks can be produced by replacing the cement and fine aggregate with utilizing the plastic for and effective way of 1:1 and 1:2, with 10& 20% replacing with quarry dust having strength 10.7 and 9.5 N/mm 2 respectively Which is 165 more than the conventional type of blocks. Similarly the water percentage is also nil and very marginal in the same proportions. The decrease in weight is existed in all the samples tested the result is equal in all mix compositions. This is uniform rate implies block undergo certain abrasion. Conclusions were drawn for utilising the above composition in a suitable non structured places and minimizing the plastic waste.

Development of a dry mortar with nanosilica and different types of industrial waste for the application in borehole heat exchangers

A geothermal borehole is a heat exchanger between the soil and a heat transfer fluid. This fluid flows throw in the geothermal pipes, which has been inserted into borehole. Using a Ground Source Heat Pump (GSHP) systems, the fluid provides heating and cooling buildings.The space between the geothermal pipes and the ground is filled with a geothermal backfill. This geothermal fill must be having high thermal conductivity for facilitate the heat flow. In this way this fill is an important element in a Borehole Heat Exchanger as its choice can result in significant economic and energy savings during the geothermal installation’s lifetime. However, in general it has not received enough attention.The geothermal backfill materials formed by a mixture of cement, fine aggregate, sand and/or additions are known as geothermal grouts. The aggregated additives and the other materials aggregated confers to the geothermal backfill high thermal conductivity. This property is rejected in the conventional grouts used in buildings.On the other hand, the use of industrial waste or by-products in geothermal grouts is considered more sustainable, for it reduces landfill volume and the need of exploiting new mineral resources.This paper describes the development of a geothermal grout, named MG 7. MG-7 has improved thermal properties compared with conventional grouts. In this case, mining and by-products from surrounding companies have been used, following the principles of the circular economy.To determinate the geothermal grout properties different techniques and conventional equipment has been used. However, to calculate the thermal conductivity a specific device developed by the authors. Finally, it has been obtained a pre-dosed geothermal grout with a thermal conductivity of 2.01 ± 0.08 W/m∙K (K = 2), in which 30 % of the aggregates come from industrial waste, such as mine tailings, ladle furnace slag, fly ash and silica fume. It also contains 2 % of silica nanoparticles.