Effect of Superplasticizer Type and Dosage on early-Age Shrinkage of Portland Cement and Rice Husk Ash Pastes

2012 ◽  
Vol 450-451 ◽  
pp. 407-412 ◽  
Author(s):  
Gritsada Sua-Iam ◽  
Natt Makul
Keyword(s):  
Portland Cement ◽  
Rice Husk ◽  
Ordinary Portland Cement ◽  
Rice Husk Ash ◽  
Early Age ◽  
Polycarboxylate Ether

In this work, the effect of superplasticizer type and dosage on early-age shrinkage of ordinary Portland cement (OPC) and rice husk ash paste (RHA) was investigated. The OPC and RHA pastes with a water/binder materials ratio (W/B) by weight of 0.22 and various dosages of polycarboxylate ether-based superplasticizers (PCE) and sulphonated naphthalene formaldehyde condensates (SNF) were investigated. RHA was partially substituted of 0%, 10% and 20 % by weight of OPC. Volumetric shrinkages of the pastes at the first 72 hours of hydration have been found to range from 0.28 to 12.26 mm3/g and from 0.20 to 9.04 mm3/g of binder materials for SNF-based and PCE-based superplasticizers, respectively. The PCE-based superplasticizer can decrease an increase in shrinkage of the OPC and RHA pastes higher than those of containing the SNF-based superplasticizer.

The Potential of Black Rice Husk Ash (BRHA) in Brick Productions

2020 ◽  
Vol 995 ◽  
pp. 155-160
Author(s):  
Nurol Huda Dahalan ◽  
M.H. Abdul Mutalib ◽  
Hooi Min Yee ◽  
Mohd Haris Ridzuan Ooi ◽  
Haslinda Abdul Hamid
Keyword(s):  
Portland Cement ◽  
Rice Husk ◽  
Ordinary Portland Cement ◽  
Rice Husk Ash ◽  
Construction Materials ◽  
Black Rice ◽  
High Demand ◽  
Earth Construction ◽  
Optimal Replacement ◽  
Depth Study

A lot of researchers have studied the rice husk brick and it is the most widely used material in earth construction. Although study has been carried out on rice husk brick previously, more in-depth study on the aspect of the optimal replacement levels of local black rice husk ash to the Ordinary Portland Cement (OPC) that will meet stated standard requirements for non load-bearing bricks need has not been carried out. Despite all the natural materials have been used in construction materials, black rice husk ash is important to be reviewed based on the rationale of availability and growing rice husk production year by year due to high demand of rice supply.

Experimental study on concrete with rice husk ash under sulphuric ACID solutions

2018 ◽  
Vol 7 (4.5) ◽  
pp. 522
Author(s):  
R. Ramya Swetha ◽  
Dr. G.Venkata Ramana ◽  
K. Anusha Hadassa
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Portland Cement ◽  
Sulphuric Acid ◽  
Rice Husk ◽  
Industrial Waste ◽  
Ordinary Portland Cement ◽  
Rice Husk Ash ◽  
Acid Solutions ◽  
Iron And Calcium

This investigation shows the results on aggressive sulphuric acid on the concrete combined with rice husk ash (RH) when partially replaced for ordinary Portland cement. The husk ash, which mainly contains aluminum ion, silica, iron and calcium oxides, is an industrial waste and poses disposal problems. In this study, the effect of various concentrations (1%, 3%, 5%) of sulphuric acid (H2SO4) on Concrete replaced with various percentages (0%,5%,10%,15% and 20% by weight of cement) of RH is evaluated in-terms of residual compressive strength. The loss of compressive strengths of concrete immersed in various H2SO4 solutions for 7 days 28 days and 60 days indicates that at upto 10% replacement increase in strength was observed after which strengths were decreasing. This increase in strength is attributed to pozzolanic activity of RH.  

The Effect of Three Different Types of Rice Husk Ash as Ad Mixture for Ordinary Portland Cement

2014 ◽  
Vol 679 ◽  
pp. 228-236 ◽  
Author(s):  
Karya Sinulingga ◽  
Harry Agusnar ◽  
Zakaria Mohd Amin ◽  
Basuki Wirjosentono
Keyword(s):  
Portland Cement ◽  
Cement Paste ◽  
Rice Husk ◽  
Ordinary Portland Cement ◽  
Rice Husk Ash ◽  
Optimum Amount ◽  
Mineralogical Characteristics ◽  
Different Types ◽  
Reactive Silica ◽  
Portland Cement Paste

The effect of three different types of rice husk ash which distinguish by color, pink, grey and white ashes were used as admixture to ordinary Portland cement paste was studied. Six batches of cement paste was prepared by adding 0-50 wt % RHA. The chemical and mineralogical characteristics of RHA were first analyzed. The characteristic of cement paste was investigated using IR, TGA and XRD. Hydration temperature also recorded. Chemical analysis shows higher amount of silica in RHA which is in range of 95-98wt. %. XRD and IR confirmed the white RHA is amorphous silica. The optimum amount of RHA addition was 10 wt. % which produced comparable properties with cement paste control. Based on Calorimetery Studied, IR, TG and hydration temperature results, white silica was found the most reactive silica but plays limited role as admixture in OPC paste.Keywords: rice husk ash, ordinary Portland cement, cement paste, hydration temperature

Effective Utilization of Industrial and Agricultural Waste for Developing Sustainable Self-Compacting Concrete

2022 ◽  
Vol 1048 ◽  
pp. 376-386
Author(s):  
M.S. Riyana ◽  
Dhanya Sathyan ◽  
M.K. Haridharan
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Portland Cement ◽  
Rice Husk ◽  
Ordinary Portland Cement ◽  
Rice Husk Ash ◽  
Cement Content ◽  
Supplementary Cementitious Materials ◽  
Ternary Blend ◽  
Self Compacting Concrete

SCC (Self compacting concrete) can fill formwork and encloses reinforcing bars under gravity and maintains homogeneity without vibration. SCC shortens the period of construction, guarantees compaction in confined zones, moreover terminates noise due to vibration. The wide spread application of SCC is restricted because of the high cost for the production of SCC with high cement content and chemical admixtures. In order to make the production of SCC economical, and to reduce the high cement content the Ordinary Portland Cement in SCC can be blended with pozzolanic materials like rice husk ash and supplementary cementitious materials like fly ash. In this paper the fresh state properties and mechanical properties such as compressive strength, split tensile strength and flexural strength of SCC with ternary blends of rice husk ash (RHA) and fly ash (FA) were studied. For this purpose, different mixes were prepared by replacing Ordinary Portland Cement (OPC) with 5%, 10%, 15% and 20% of rice husk ash (RHA) and the percentage of addition of fly ash (FA) is fixed as 15% for all these mixes. It was observed that the specimen incorporating 10% of rice husk ash (RHA) and 15% of fly ash (FA) as ternary blend exhibits better mechanical properties such as: Compressive, split tensile and flexural strengths at 28 days of age as compared to traditional mix of SCC without RHA (Rice Husk Ash) and FA (Fly Ash). This research demonstrates that the ideal percentage for a mixture of rice husk ash (RHA) and fly ash as ternary blend is 10% and 15% respectively.

Microstructure and Dielectric Properties of 0-3 Cement/Rice Husk Ash-Lead Niobate Zirconate Titanate Ceramic Composites

2015 ◽  
Vol 804 ◽  
pp. 119-123
Author(s):  
Nittaya Jaitanong ◽  
Arnon Chaipanich
Keyword(s):  
Dielectric Properties ◽  
Portland Cement ◽  
Rice Husk ◽  
Room Temperature ◽  
Ordinary Portland Cement ◽  
Rice Husk Ash ◽  
Ceramic Composites ◽  
Particle Sizes ◽  
Zirconate Titanate ◽  
Titanate Ceramic

The microstructure and dielectric properties of lead niobate zirconate titanate (PNZT), rice husk ash (RHA) and Ordinary Portland cement (OPC) composites were investigated. Ordinary Portland cement was partially replaced with rice husk ash at 20% by weight of binder. The rice husk ash was ground for 180 minutes before using. PNZT of mid particle sizes (450μm) were used at 30%, 50% and 70% by volume to produce the composites. The composites were mixed and pressed together and cured with 97%RH in chamber water bath for 3 days before measurements. The dielectric properties were measured under room temperature at different frequency. The results indicated that the dielectric constant of the 0-3 PC/RHA-PNZT composites increased with increasing PNZT content.

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