• Step 6 o When the correct slump is reached check the cohesiveness and the stone content of the mix adjust if necessary. o Weigh out the left-over 10kg of stone and 10kg of sand then calculate the concrete mix proportions. (B) • Method 1 o Membrane-forming liquids sprayed onto the surface of concrete to inhibit evaporation of water must be applied as soon as either the bleed water has evaporated from the surface or bleeding has
one of the promising applications of Nano silica is to promote the hydration of cement blended with fly ash, slag or other pozzolanic materials(21; 7; 22). Some authors concluded that Nano silica can improve concrete workability and strength (23; 24; 25). Also others concluded that when NS (wt.%) is mixed into the cement mortar in the fresh state it has a direct influence on the water amount required in cement mixtures, for that higher amounts of water or chemical admixtures are needed to keep the workability of the mixture (26; 27; 16). 2.2.2. Influence of Nano silica addition on cement pastes, and mortars Hui Li et al.
184.108.40.206. Concrete classification: Lightweight concrete can be classified according to: 220.127.116.11.1. The production methods: There are three methods of producing lightweight concrete. First, lightweight aggregate has a specific gravity of 2.6 mm. That type of concrete is generally known by the name of lightweight aggregate.
Finely ground limestone powder was supplied from Ashutosh Chemicals ,Talik Bazar Chowk Near Old Delhi Railway Station. Fig. 3.2 (a) Fine Aggregate used in mix Fig. 3.2 (b) Quarry dust 3.3 Test on materials 1. The Cement were tested for physical properties such as: Fineness test Standard consistency test Soundness test Setting time test Specific gravity test, 2.
Coarse aggregates Aggregates which are retained on 4.75-mm IS Sieve conforming IS 383- 1970 are known as coarse aggregate. Coarse aggregate are the main load bearing component of concrete. Locally available coarse aggregate having the size of 20 mm was used in our work. figure 3.4 shows the sieve shaker apparatus used for the sieve analysis of aggregates. Table 3.5 shows the properties of coarse aggregate used in experimental work.
The CO2 is then converted to a new calcium carbonate cement system which is then used to produce an assortment of valuable products. The manufacturing of building materials made from this novel cement system is Calera’s main focus. According to Calera (2015), without having to be concentrated, CO2 can be captured from the emitting sources by Calera’s process and then converted into the solid material calcium carbonate, permanently trapping and isolating the
2.2 Characteristics on Glass Fibre Reinforced Concrete (GFRC) Glass fibre reinforced concrete is defined as a concrete composition that consist material such as cement, sand, water and admixtures with short length discrete glass fibre were dispersed (Amit Rai et al,2014). It had been using in many countries. Part of research study on the effect of stirrup spacing with 50mm,75mm and 100mm by adding various weight percentage of glass fibre that 0.75% and 1.5% respectively. Based on experimental result shown that the shear strength of tested beam increased as well as the weight percentage of glass fibres (Soliman et.al,2012). The main factor that makes glass fibre was used in construction were it possessed high compressive strength on concrete
Like compressive strength, MR is influenced by mix design parameters including: • w/c ratio; • Cement type; • Cement content; • Aggregate properties (type, maximum size, gradation, and surface texture). ( Forster, 1997 ) 18.104.22.168.1.1. Modulus of Rupture for normal weight concrete in (ESS 203): The tensile strength
The performance of propylene glycol (PG) on the grindability, setting and hardening of Portland and Portland-Limestone cements (PLC) was studied. Propylene glycol was added to OPC clinker with percentage ratios; 0, 0.03, 0.04 and 0.05 wt.% of the OPC clinker. PLC was made by replacing 5 and 10 wt. % of OPC with limestone. PG offers better grinding aid performance with higher Blaine areas.
This due to the increase of packing density of particles of sand due to the very fine fillers which provide very less space for water between sand grains as compared to standard mixes. Tests performed on hardened concrete 3.8.1 Compressive, Flexural and Split tensile strength test To observe the performance of concrete prepared by replacement of cement and sand by marble powder as well as addition of marble powder to the standard concrete these tests were performed. For compressive strength cubes of dimensions 150mm×150mm×150mm were prepared. To check the repeatability of results three cubes of each mix were prepared and then tested for 7days and 28 days strength in compression testing machine. For flexural strength beams of dimensions 150mm×150mm×700mm were prepared.