Abstract
Physalis pith ash (PPA) is a renewable and green supplementary cementitious material. It is an effective approach to reduce the quantity of cement that could be used in blended cements. This will reduce the CO2↑ emission, which in turn will lower the environmental pollution. In the current study, the influence of PPA on physicomechanical characteristics of hydrated cement pastes containing various ratios of PPA (0-30 wt.%) up to 90 days was evaluated. Results showed that the water of consistensy as well as setting times, chemically-bound water content, bulk density and compressive strength increased with PPA content. The apparent porosity and calcium dioxide (or free lime) content were clearly reduced with increasing the PPA content. It is therefore concluded that the cement could be partially replaced by 25 wt.% PPA with no reverse response on the features of cement pastes. Any further increase of PPA content, it affected negatively on all the specific attributes of the hardened cement pastes. So, an optimum PPA content was 25 wt% PPA.
Highlights
Seven cement mixtures were prepared from Ordinary Portland cement pastes (OPC) and Physalis pith ash (PPA) as 100:0, 95:5, 90:10, 85:15, 80:20, 75:25 and 70:30 having the symbols: P0, P1, P2, P3, P4, P5 and P6, respectively
The cement pastes were moulded into one inch cubic stainless steel moulds (2.5 x 2.5 x 2.5 cm3) using about 500 g from the cement powder batch, vibrated manually for three minutes, and on a mechanical vibrator for another three minutes to eliminate all air bubbles tapped inside the cement pastes
The PPA powder is expected to be as a pozzolanic material in the cementitious system
Summary
Growing to 0.4 to 3.0 meters height, which is a plant of the same family of the common Tomato. It is always a stiffer, more upright stem of the Solanaceae family. These can be either annual or perennial. Several plant species of the genus physalis peruviana in the nightshade family Solanaceae, has its origin in Peru. In Egypt, it is well known as “Harankash”. Egyptians like this fruit to a large extent. Random burning of either fruit covers of Physalis or even any kinds of agro/wastes that generates what is known as “Black Cloud” which pollutes the environment
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