scholarly journals Deltaic Lateritic Soil in 1:5:11 Mix Design for Producing Controlled Low-Strength Material (CLSM) for Pavement Backfill

2021 ◽  
Vol 18 (3) ◽  
pp. 244-250
Author(s):  
J.A. Oke
Keyword(s):  
Compressive Strength ◽  
Concrete Strength ◽  
Mix Design ◽  
Lateritic Soil ◽  
Strength Development ◽  
Conventional Concrete ◽  
Strength Material ◽  
Low Strength ◽  
Controlled Low Strength Material ◽  
Materials Used

Deltaic lateritic soil obtained from Emohua in Rivers State, Nigeria was studied to ascertain its suitability as a substitute to sand in concrete for producing controlled low-strength material (CLSM). Cement, coarse aggregate, as well as lateritic soil which replaced sand was combined in ratio 1:5:11 to produce lateritic concrete using varying water-cement (w/c) ratios at varying curing durations. Variation in the w/c ratios ranging from 0.2 to 0.5 at 0.1 intervals and the curing periods which varied between 7, 14 and 28 days were examined. As with the case with conventional concrete, strength development, as well as cement hydration took place after casting over the curing periods. Recent applications using CLSM recommends that a compressive strength of 8.3 N/mm2 or less is required for materials used as conventional compacted backfill soil or structural fillings. In a situation where future excavation is envisioned, it is recommended that the maximum long-term compressive strength of CLSM should generally have an upper limit of 2.1 N/mm2 for compacted backfill material hence, the lateritic concrete produced in this study using the 1:5:11 mix design at 0.2 w/c ratio, cured for 28 days which gave strength of 5.3 N/mm2 can be used as CLSM which primarily, can be utilized as a substitute for compacted backfill to sub-base and/or subgrade of flexible pavements. Where necessary, super plasticizer can be introduced to increase flowability of the lateritic concrete.

scholarly journals Utilization of EPS Beats and Polypropylene Fiber in Controlled Low Strength Material

2021 ◽  
Vol 11 (6) ◽  
Author(s):  
Minakshi Uchibagle ◽  
B Ram Rathan Lal
Keyword(s):  
Compressive Strength ◽  
Polypropylene Fiber ◽  
Polypropylene Fibers ◽  
Fresh Properties ◽  
Pond Ash ◽  
Soil Cement ◽  
Potential Possibility ◽  
Strength Material ◽  
Low Strength ◽  
Controlled Low Strength Material

Controlled low-strength material (CLSM) is a self-levelling cementitious material. It is not concrete nor soil-cement, however, it possesses properties similar to both. CLSM is widely used as a replacement for soil-cement material in many geotechnical applications such as structural backfill, pipeline beddings, void fill, pavement bases and bridge approaches. This paper study potential possibility of polypropylene fiber in CLSM. Harden and fresh properties compressive strength , flowability and density for the proposed CLSM were investigated. This CLSM mix design with different percentage of polypropylene fiber and pond ash, cement and water. EPS beats and polypropylene add 0 %, 0.5%, 1.0% and 1.5% of total weight is added in CLSM MIx. Results show that the CLSM incorporating EPS beats and polypropylene satisfies compressive strength requirement as per the requirements of ACI committee 229. polypropylene decreases the flowability of CLSM mix and at the same tine by adding EPS beats the density of CLSM mix are reduce which become lightweight CLSM mix. from this it can conclude that polypropylene fibers is less effective in CLSM mix and EPS beats make CLSM mix lightweight which create lightweight CLSM mix applicable for filling application.

scholarly journals The influence of molarity variations to the mechanical behavior of geopolymer concrete

2018 ◽  
Vol 195 ◽  
pp. 01010
Author(s):  
Purwanto ◽  
Ay Lie Han ◽  
Nuroji ◽  
Januarti Jaya Ekaputri
Keyword(s):  
High Performance ◽  
Concrete Strength ◽  
Material Behavior ◽  
Mix Design ◽  
Basic Material ◽  
Strength Development ◽  
Geopolymer Concrete ◽  
Conventional Concrete ◽  
Aggregate Content ◽  
Maximum Value

Research on geopolymer concrete has seen a new light in the analyses and experiments for special topics in the field of their mechanical properties. Among the most important are studies of geopolymer concrete subjected to confinement and bond. Regarding the basic material behavior, research of material proportions formulations, mix design formulas and inventions towards the development of a high-performance geopolymer concrete, were conducted. The latest looked into the effects of molar activator concentrations to the 28 days compression strength, and the strength development as a function of concrete age for geopolymer concretes. The specimens were 150 by 300-millimeter cylinders tested in uniaxial compression. The molarity variations were set at 6, 8, and 10 molars. The geopolymer concrete samples were compared to conventional concrete specimens, having the exact same volumetric material proportions. The cement was replaced with fly ash, and the activator with water. The aggregate content was taken as a constant. The concrete strength as a function of molar increase followed a parabolic, convex pattern, suggesting that a maximum value exists. The strength development of all geopolymer concretes had a slower rate when compared to conventional concrete.

Engineering Properties of Controlled Low-Strength Material Made with Residual Soil and Class F Fly Ash

2014 ◽  
Vol 597 ◽  
pp. 345-348 ◽  
Author(s):  
Yeong Nain Sheen ◽  
Li Jeng Huang ◽  
Duc Hien Le
Keyword(s):  
Compressive Strength ◽  
Elastic Modulus ◽  
Fly Ash ◽  
Setting Time ◽  
Engineering Properties ◽  
Residual Soil ◽  
Strength Material ◽  
Low Strength ◽  
Controlled Low Strength Material ◽  
Class F Fly Ash

This paper aims to employ combination of residual soil and Class F fly ash in developing a controlled low-strength material (CLSM), primarily used as backfilling material. In the mixture, surplus soil and concrete sand was blended well together with a given proportion of 6:4 by volume. Three levels of binder content (i.e. 80-, 100-and 130 kg/m3) and different percentages fly ash (i.e., 0%, 15%, 30%, and 45%) substituting to Portland cement were previously chosen for mix design. Several major engineering properties of the CLSM such as fresh density, flowability, setting time, water bleeding, unconfined compressive strength, and elastic modulus were investigated via a laboratory study. Testing results indicate that most of the proposed CLSM mixtures satisfy the requirements of excavatability as the 28-days compressive strength ranges from 0.3 to 1.4 MPa. In addition, increase in FA substituting to OPC resulted in workability improvement, setting time extension as well as compressive strength and elastic modulus reduction.

Properties of lightweight alkali activated controlled Low-Strength material using calcium carbide residue – Fly ash mixture and containing EPS beads

2021 ◽  
Vol 297 ◽  
pp. 123769
Author(s):  
Saofee Dueramae ◽  
Sasipim Sanboonsiri ◽  
Tanvarat Suntadyon ◽  
Bhassakorn Aoudta ◽  
Weerachart Tangchirapat ◽  
...  
Keyword(s):  
Fly Ash ◽  
Calcium Carbide ◽  
Calcium Carbide Residue ◽  
Strength Material ◽  
Low Strength ◽  
Controlled Low Strength Material ◽  
Alkali Activated
Sign in / Sign up

Export Citation Format

Share Document