Improved mix design method of self-compacting concrete based on coarse aggregate average diameter and slump flow

2017 ◽  
Vol 143 ◽  
pp. 566-573 ◽  
Author(s):  
Kunlin Ma ◽  
Jin Feng ◽  
Guangcheng Long ◽  
Youjun Xie ◽  
Xiaobo Chen
Keyword(s):  
Coarse Aggregate ◽  
Design Method ◽  
Average Diameter ◽  
Mix Design ◽  
Self Compacting Concrete ◽  
Slump Flow

Experimental Study on the Workability of Self-Compacting Granite and Unwashed Gravel Concrete

2017 ◽  
Vol 31 ◽  
pp. 69-76
Author(s):  
Gideon O. Bamigboye ◽  
David O. Olukanni ◽  
Adeola A. Adedeji ◽  
Kayode J. Jolayemi
Keyword(s):  
Experimental Study ◽  
Coarse Aggregate ◽  
Mix Design ◽  
Fine Aggregate ◽  
Self Compacting Concrete ◽  
Consistency Test ◽  
Coarse Aggregates ◽  
Slump Flow ◽  
Filling Ability ◽  
Passing Ability

This study deals mainly with the mix proportions using granite and unwashed gravel as coarse aggregate for self-compacting concrete (SCC) and its workability, by considering the water absorption of unwashed gravel aggregate. Mix proportions for SCC were designed with constant cement and fine aggregate while coarse aggregates content of granite-unwashed gravel combination were varied in the proportion 100%, 90%/10%, 80%/20%, 70%/30%, 60%/40%, 50% /50%, represented by SCC1, SCC2, SCC3, SCC4, SCC5 and SCC6. 100% granite (SCC1) serves as the control. The workability of the samples was quantitatively evaluated by slump flow, T500, L-box, V- funnel and sieve segregation tests. Based on the experimental results, a detailed analysis was conducted. It was found that granite and unwashed gravel with SCC1, SCC2 and SCC3 according to EFNARC (2002) standard have good deformability, fluidity and filling ability, which all passed consistency test. SCC1, SCC2 and SCC3 have good passing ability while all mixes were in the limit prescribed by EFNARC (2002). It can be concluded that the mix design for varying granite-unwashed gravel combination for SCC presented in this study satisfy various requirements for workability hence, this can be adopted for practical concrete structures.

scholarly journals Designing of Flow Mortar Design Mix for Self Compacting Concrete (SCC) with FWC = 0.4

2019 ◽  
Vol 5 (1) ◽  
pp. 39
Author(s):  
Noor Adi Wibowo
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
Weight Ratio ◽  
Mix Design ◽  
Type I ◽  
Optimum Ratio ◽  
Self Compacting Concrete ◽  
Slump Flow ◽  
Absolute Volume ◽  
Grade Iii

 Self Compacting Concrete (SCC) is an innovation to produce concrete that could flow independently without being compacted. One of the practical methods is by making the mortar mix design first. The purpose of this research was to find optimum value of the flow mortar which will be base in the design of self-compacting concrete; and to find the optimum ratio of the mortar’s absolute volume to the volume of coarse aggregate cavity. The mortar material used type I cement, silica fume content 10% of cement weight, ratio of cement and grade III cement was of 1:1.25; water-cement factor of 0.4; and superplasticizer content of 0.3%, 0.4%, 0.5%, and 0.6% of cement weight. In this design of self-compacting concrete, the ratio of mortar absolute volume to coarse aggregate cavity were of 1.4, 1.6, and 1.8 with size of coarse aggregate of 10-20 mm. This research showed the optimum content of superplasticizer on mortar was of 0.6% which resulted slump flow of 260 mm, and compressive strength of 57.44 MPa. The testing result of SCC showed optimum value on ratio of mortar absolute-volume to coarse aggregate cavity was of 1.8 resulted slump flow of 280 mm, and compressive strength of 65.76 MPa.

Suitability of Quarry Dust as a Partial Replacement of Fine Aggregate in Self Compacting Concrete

2018 ◽  
Vol 877 ◽  
pp. 248-253
Author(s):  
Thete Swapnil Tanajirao ◽  
D. Arpitha ◽  
Suman Saha ◽  
C. Rajasekaran
Keyword(s):  
Coarse Aggregate ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Self Compacting Concrete ◽  
Slump Flow ◽  
Fine Aggregates ◽  
Material Gain ◽  
Optimum Utilization ◽  
Hardened Properties ◽  
Quarry Dust

Large quantity of the quarry dust gets produced annually in the quarries during the extraction of the crushed coarse aggregate. As a result, disposal problems of this material gain significant momentum as these disturb environmental systems also. Now-a-days many of the countries like India is facing problems of ban on the extraction of sand and lacunae in procuring of fine aggregate, which is important constituent of the concrete. To overcome this problem, present study is focused on the suitability to utilize the quarry dust in Self Compacting Concrete (SCC) partially as fine aggregate with the natural fine aggregates. In this work, quarry dust is used as replacement of sand in a different level (0%, 15%, 30%, 45% and 60%) for producing the SCC. Fresh properties such as slump flow and V-funnel time have been measured for all mixes and hardened properties as compressive strength, splitting tensile strength and flexural strength of the concrete have been checked for all the mixes and it has been found that optimum utilization of quarry dust up to 30% can been done to produce SCC without compromising with its properties.

Mechanical Properties of Rubberized Self Compacting Concrete Containing Silica Fume

2011 ◽  
Vol 261-263 ◽  
pp. 441-445 ◽  
Author(s):  
Yousef Rahmani ◽  
Mohammad Reza Sohrabi ◽  
Ahmad Askari
Keyword(s):  
Mechanical Properties ◽  
Silica Fume ◽  
Coarse Aggregate ◽  
Fresh Concrete ◽  
Critical Issue ◽  
Crumb Rubber ◽  
Self Compacting Concrete ◽  
Waste Rubber ◽  
Slump Flow ◽  
Flow Test

The disposal of waste rubber produced each year is a critical issue for any country, because this material doesn't resolve easily and leads to more environmental pollution. Utilizing waste rubber in industry is an alternative for the disposal of this matter. In the present study 5%, 10% and 15% of coarse aggregate is replaced with crumb rubber by volume along with 5%, 10% and 15% silica fume as cement replacement by weight in self compacting concrete. There were several rheological tests carried out on fresh concrete such as slump flow test, T50, J-ring, L-box and V-funnel test. Mechanical properties of specimens were also examined; compressive strength at 7 and 28 days of curing and modulus of elasticity and density of hardened cylindrical specimens at 28 days of curing.

EFFECTS OF BAMBOO FIBERS AND LIMESTONE POWDER ON FRESH PROPERTIES OF SELF-COMPACTING CONCRETE

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Anthony Nkem Ede ◽  
Obatarhie Oshogbunu ◽  
Oluwarotimi Michael Olofinnade ◽  
Kayode Joshua Jolayemi ◽  
Solomon Olakunle Oyebisi ◽  
...  
Keyword(s):  
Coarse Aggregate ◽  
Particle System ◽  
Limestone Powder ◽  
Water Quantity ◽  
Cement Particle ◽  
Fresh Properties ◽  
Self Compacting Concrete ◽  
Slump Flow ◽  
Flow Test ◽  
Bamboo Fibers

Self-compacting concrete (SCC) flows through densely steel reinforced elements and consolidates under self-weight without need for vibration or compaction. This helps in complex and densely reinforced structures. The integration of fibers and fillers in concrete improves its general properties. The addition of fibers in particular can regulate the flow and workability of the concrete; hence, the high workable nature of SCC can be an ideal mix for the incorporation of fibers. This research investigates the effect of bamboo fibers and limestone powder on the fresh properties of self-compacting concrete. Bamboo fibers of an aspect ratio of 50 and varied volumes of 0.25%, 0.5%, 0.75% and 1% were adopted for this research. The workability of the mix was assessed by slump flow test and V-funnel test. For fiber volumes of 0.25%, 0.5%, 0.75%, it was observed that the coarse aggregate was evenly distributed across the spread, indicating good viscosity and stability of the mix. The presence of 10% percent limestone powder improved the workability of the concrete mix. This can be attributed to filler properties of limestone powder, which, affecting the cement particle system, changed the ordinary distance between them and modified the water quantity available for the hydration process. These results proved that the bamboo fiber and limestone powder can be sustainably adopted to regulate the flow-ability of SCC without compromising desired properties.

scholarly journals Effect of recycled coarse aggregate on the properties of C40 self-compacting concrete

2019 ◽  
Vol 28 ◽  
pp. 096369351988512 ◽  
Author(s):  
Yunyang Wang ◽  
Bingchen Zhao ◽  
Guang Yang ◽  
Yandong Jia ◽  
Lijun Yang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Modulus Of Elasticity ◽  
Coarse Aggregate ◽  
Lower Amount ◽  
Theoretical Formula ◽  
Self Compacting Concrete ◽  
Recycled Coarse Aggregate ◽  
Slump Flow ◽  
Experimental Values

The effect of recycled coarse aggregate (RCA) on the fresh and hardened properties of C40 self-compacting concrete (SCC) was investigated in this paper. The slump, T 500 (the time needed for SCC to spread into a round configuration with a nominal diameter of 500 mm), the slump flow and the flow time of fresh C40 SCC as well as the compressive strength and modulus of elasticity of hardened C40 SCC were studied. The modulus of elasticity of C40 SCC was calculated by theoretical formula, and the calculated values were compared with the experimental values. Mechanisms that effect on the C40 SCC properties at fresh and hardened states were also explored. The experimental results showed that the slump values of the C40 SCC are beyond 250 mm. The C40 SCC with RCA replacement content of 50% showed the highest slump value of 275 mm. All T 500 values of the C40 SCC are within 5 s. The slump flow of the C40 SCC slightly increases with the increase of replacement content of the RCA. In contrast, the compressive strength and modulus of elasticity of the C40 SCC slightly decrease with the increase of replacement content. The experimental values of modulus of elasticity are lower than that of the calculated values. Submerged in water before mixing of RCA leading to the slump flow of the C40 SCC increases with the increasing replacement content of the RCA. The old cement mortar attached to the RCA surface is the main reason that weakens the mechanical properties. The lower amount of coarse aggregate and the higher amount of cement paste attribute to the lower values of modulus of elasticity. This study implied that RCA can be effectively used in the production of C40 SCC without any significant sacrifice on workability and mechanical properties.

scholarly journals Studi Pemanfaatan Prekursor Fly Ash Lokal pada Self Compacting Geopolymer Concrete (SCGC)

2021 ◽  
Vol 24 (2) ◽  
pp. 111-119
Author(s):  
Evelyn Anabela Anisa ◽  
Rahmad Afriansya ◽  
Julian Randisyah ◽  
Pinta Astuti
Keyword(s):  
Fly Ash ◽  
Mix Design ◽  
Geopolymer Concrete ◽  
Self Compacting Concrete ◽  
Slump Flow

Beton merupakan suatu material yang banyak digunakan dalam dunia konstruksi. Namun, setiap produksi beton menimbulkan dampak buruk pada pemanasan global. Semen sebagai bahan pengikat beton dapat menyumbang emisi CO2 sebanyak 8% dalam setiap produksinya. Proses pengecoran pada beton juga dapat menghasilkan polusi suara akibat penggunaan alat vibrator. Para peneliti terus berupaya menghasilkan beton yang lebih ramah lingkungan. Self Compacting Geopolymer Concrete (SCGC) merupakan kombinasi baru antara beton geopolimer dan Self Compacting Concrete (SCC) yang masih terus diteliti dan dikembangkan hingga saat ini. SCGC merupakan beton ramah lingkungan karena tidak menggunakan semen portland sebagai bahan pengikatnya. Penggunaan beton SCGC tidak memerlukan vibrator karena memiliki sifat flowability yang baik. Penelitian ini menggunakan bahan pengikat berupa material pozzolan yang mengandung senyawa kimia berupa SiO2 dan Al2O3. Tahapan penelitian ini dilakukan dengan mencari metode curing dan mix design optimal dalam penyusunan SCGC. Pengujian XRF perlu dilakukan dalam penelitian ini untuk mengetahui kandungan senyawa kimia pada fly ash Tjiwi Kimia. Beberapa pengujian beton segar SCGC diperoleh hasil berupa slump flow 690 mm, T50 2,4 detik, v-funnel 8,35 mm, dan rasio l-box 0,84. Sifat mekanik beton diuji berdasarkan kuat tekan, kuat tarik belah, dan kuat lentur dengan hasil rata-rata sebesar 27,05 MPa, 6,32 MPa, 1,91 MPa.

Sign in / Sign up

Export Citation Format

Share Document